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DATE: May 21, 2026 at 10:00AM
SOURCE: PSYPOST.ORG

** Research quality varies widely from fantastic to small exploratory studies. Please check research methods when conclusions are very important to you. **
-------------------------------------------------

TITLE: Major depressive disorder might alter the body’s amino acid metabolism

URL: https://www.psypost.org/how-major-depressive-disorder-alters-the-body-s-amino-acid-metabolism/

Depression appears to drive changes in how the body processes a specific amino acid called valine, rather than the other way around. This discovery, published in Psychopharmacology, helps explain why metabolic problems often accompany poor mental health.

The World Health Organization currently ranks depression as the third leading cause of the global disease burden. Experts project it will reach the number one spot by the end of the decade. Major depressive disorder is one of the most common mental health conditions worldwide, affecting how people feel, think, and handle daily activities.

Depression is primarily known for its psychological toll, but it also produces physical symptoms like fatigue, appetite loss, and sleep disturbances. Many individuals with the disorder eventually develop metabolic abnormalities. Patients often experience unexplainable shifts in how their body processes energy, which has puzzled the medical community for years.

Some patients develop a cluster of metabolic conditions that includes high blood pressure, high blood sugar, and abnormal cholesterol levels. Patients dealing with both psychological symptoms and metabolic syndrome face a heavier overall disease burden. This combination typically creates a much tougher path to recovery for the patient.

A leading suspect in these metabolic shifts is the regulation of amino acids. Amino acids are the basic chemical units of proteins, which the body uses to build tissue and create chemical messengers. Some of these are known as branched-chain amino acids, named for a physical structure that resembles a branching tree. Valine, leucine, and isoleucine are the three kinds of branched-chain amino acids found prominently in the human diet and body.

These specific amino acids play directly into brain function. They rely on special transport proteins to cross the blood-brain barrier, a tight cellular boundary that protects the nervous system. Once inside the brain, they help maintain normal cellular function and aid in the production of specific mental health chemicals.

Certain amino acids compete for the same transports as the chemical precursors to serotonin, a compound heavily tied to mood regulation. When the body fails to metabolize these nutrients properly, the resulting imbalance can interfere with overall brain health.

Previous research offered conflicting views on the relationship between branched-chain amino acids and depression. Some small-scale observational studies suggested that high levels of these amino acids offered a protective effect against depression. Other large-scale projects found the exact opposite, noting that high levels of isoleucine were tied to an increased risk of developing the disorder. These mixed results left scientists unsure of how to interpret the data.

Observational studies suffer from a classic directional dilemma. When researchers observe a link between a chemical and a disease, they cannot easily tell which one caused the other. The relationship might also be entirely coincidental, driven by outside factors like diet, exercise habits, or gut bacteria.

To bypass these confounding variables, researchers Xiang Li and Jianyi Wang at Guangxi University in China utilized a different approach. The scientific team turned to genetics to establish the true sequence of events between depression and metabolic changes. Because inherited traits are assigned at birth, they act as a natural timeline.

This analytical technique is called Mendelian randomization. Scientists look at tiny genetic differences that influence a specific trait, such as the natural concentration of valine in the blood. People inherit these genetic markers randomly from their parents. As a result, the genes act like a randomized clinical trial, naturally separating the population into groups with lifelong high or low levels of an amino acid.

By observing these large groups, researchers can see if a lifetime of elevated valine leads to higher rates of depression. They can also run the statistical test in the opposite direction. By analyzing natural genetic markers tied to a higher risk of depression, scientists can check if an increased risk for the psychological disorder leads to elevated amino acid levels.

The study utilized public databases containing genetic information from hundreds of thousands of people. The researchers gathered large-scale genomic data covering individuals with diagnosed major depressive disorder. They also pulled data for more than 115,000 individuals with recorded levels of the three branched-chain amino acids.

The selected genomic data was restricted to individuals of European descent to prevent population differences from skewing the statistics. The data was filtered again to remove genetic variations known to be linked to outside lifestyle factors, such as high alcohol consumption.

The researchers first tested the hypothesis that high levels of amino acids influence mental health. When they ran the statistical models, the results were not statistically significant. A genetic predisposition to naturally higher levels of valine, leucine, or isoleucine did not increase the likelihood of developing the mental health condition.

The reverse analysis yielded a different outcome. The researchers found that a genetic predisposition to major depressive disorder caused an increase in circulating valine levels. This directional relationship was exclusive to valine. The condition did not have a causal effect on leucine or isoleucine levels.

The discovery helps frame metabolic problems as a downstream consequence of depression. The research team proposed several biological explanations for why an individual with depression might experience a buildup of a single amino acid. One major factor involves the immune system.

Depression is frequently accompanied by chronic inflammation throughout the body and nervous system. When the body enters an inflammatory state, specialized immune cells become overly active. These cells release inflammatory chemical messengers like interleukins and tumor necrosis factors into the surrounding tissue.

These chemical signals act on the cellular level to modify how the body operates. Inflammatory signals can suppress the expression of genes responsible for absorbing and processing branched-chain amino acids. Specifically, the researchers pointed to a cellular pathway that downsizes the production of amino acid transport proteins.

Without enough of these proteins, cells absorb less valine. At the same time, the inflammation negatively affects the chemical catalysts responsible for breaking down the amino acid. Without the necessary catalysts functioning at full capacity, the body struggles to process and remove valine.

The chemical then accumulates in the bloodstream. This accumulation is not merely a harmless byproduct. The buildup of valine could potentially trigger further inflammatory responses from immune cells, creating a loop that sustains the physical symptoms of depression.

Another potential mechanism involves cellular energy production and an unconventional gas messenger called nitric oxide. Past studies have shown that patients with severe depression often produce higher levels of nitric oxide. This reactive gas can physically bind to and disable the specific protein groups that normally dismantle branched-chain amino acids for energy.

Inside human cells, structures called mitochondria generate the power needed to survive. Mitochondrial dysfunction is a known issue for people dealing with major depressive disorder. Because valine is normally broken down to help produce glucose for the body, struggling energy systems might be unable to process it efficiently.

The researchers additionally evaluated the genetic data to check for overlapping causal points. They sought to determine if a single biological mechanism, like a shared genetic mutation, was responsible for both the depression risk and the valine buildup. The statistical analysis showed no specific shared mutation. The link appears to stem from broader systemic bodily effects rather than one specific shared genetic flaw.

The findings come with a few caveats. The genetic data primarily relied on populations of European descent. The researchers noted that these results might not apply universally to populations with different genetic backgrounds. Broadening the scope of the genetic data in the future will help verify these patterns globally.

The exact biological mechanisms driving the valine accumulation still require experimental verification in a laboratory setting. The genetic evidence strongly points toward a specific directional relationship, but mapping the exact chemical pathways will take more time.

The medical field is increasingly recognizing the physical dimensions of mental health conditions. By mapping out how depression alters bodily functions like valine metabolism, researchers can begin to explore new avenues for treatment. Addressing these downstream metabolic effects could eventually help relieve the broader physical burden placed on those experiencing the disorder.

The study, “Branched-chain amino acids and risk of major depressive disorder: a Mendelian randomization and colocalization study,” was authored by Xiang Li and Jianyi Wang.

URL: https://www.psypost.org/how-major-depressive-disorder-alters-the-body-s-amino-acid-metabolism/

-------------------------------------------------

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-------------------------------------------------

#psychology #counseling #socialwork #psychotherapy @psychotherapist @psychotherapists @psychology @socialpsych @socialwork @psychiatry #mentalhealth #psychiatry #healthcare #depression #psychotherapist #DepressionAndMetabolism #ValineLinkToDepression #BranchedChainAminoAcids #MendelianRandomization #MentalHealthResearch #AminoAcidMetabolism #InflammationAndMood #DepressionBiology #ValinePathway #PsychopharmacologyStudies

DATE: May 20, 2026 at 12:00PM
SOURCE: PSYPOST.ORG

** Research quality varies widely from fantastic to small exploratory studies. Please check research methods when conclusions are very important to you. **
-------------------------------------------------

TITLE: Can gut bacteria cause postpartum depression?

URL: https://www.psypost.org/how-gut-bacteria-change-genetic-switches-to-influence-postpartum-depression/

Recent research suggests a potential causal link between specific gut bacteria, blood metabolism, and the development of postpartum depression. By analyzing massive genetic databases, scientists mapped how microbial communities alter genetic switches and cholesterol levels to influence maternal mental health. The findings were published in the Journal of Affective Disorders.

Postpartum depression affects roughly 14 percent of people after giving birth. The condition impacts maternal quality of life and infant attachment. Currently, treatments remain limited because the biological mechanisms driving the disorder are not entirely understood. By the time symptoms emerge, physicians have few tools to reverse the condition.

Emerging evidence points toward the gut microbiome as a major factor in mood and brain health. Trillions of bacteria living in the digestive tract produce chemicals that communicate with the brain. This connection is often called the gut-brain axis. It regulates everything from immune responses to the maintenance of the blood-brain barrier.

Under normal conditions, intestinal microbes also facilitate the production of neurotransmitters like serotonin and essential energy sources called short-chain fatty acids. During pregnancy and after childbirth, the maternal digestive system undergoes profound remodeling. Researchers suspect that shifts in this bacterial landscape alter the ways the body processes hormones, steroids, and energy.

Zhiyuan Zhang, a researcher at Tongji University in Shanghai, and colleagues sought to map how these gut microbes interact with the host’s metabolism. They wanted to see if specific bacteria drive postpartum depression through blood metabolites and genetic switches.

To investigate this chain of events without the confounding factors of clinical trials, Zhang and colleagues used a technique known as Mendelian randomization. This approach relies on the natural, random assortment of genetic variations passed down during conception. Scientists use these genetic differences as a proxy to test if a specific exposure actually causes a disease, rather than just appearing alongside it.

Because genes are inherited randomly and cannot be altered by a person’s diet or environment later in life, they serve as an objective anchor for observing biological cause and effect. It allows researchers to bypass lifestyle differences that usually obscure nutritional and microbial studies.

The team pulled information from multiple large-scale global databases. They integrated genetic details from the MiBioGen consortium, a massive database covering tens of thousands of individuals, looking at genetic variations linked to the abundance of specific gut bacteria. They then cross-referenced these variations with genetic data from the FinnGen consortium, which included over 13,000 women who had experienced postpartum depression.

In another phase of the study, the investigators looked for biological mediators in the blood. They searched for circulating molecules that might carry signals from the gut to the brain by examining the UK Biobank dataset. In total, they examined 249 different measures of lipids, fatty acids, and small molecules like amino acids.

Finally, they assessed epigenetic factors, which are chemical tags on DNA that turn gene activity up or down without changing the genetic code itself. Specifically, the researchers examined DNA methylation, a process where tiny chemical clusters attach to genes to modify how much of a certain protein the body produces. They analyzed whether variations in these methylation patterns in blood tissue overlapped with the genetic risks for postpartum depression and gut bacteria levels.

The researchers identified totally different roles for various groups of bacteria. Six bacterial groups were associated with an elevated risk of developing postpartum depression. These included the class Clostridia, the order Bifidobacteriales, and several specific genera like Eggerthella. Conversely, a group known as the phylum Verrucomicrobia appeared to exert a protective effect against the disorder.

The team then traced how some of these bacteria influence mental health by looking at blood chemistry. They found that certain fats connected to high-density lipoprotein, commonly known as good cholesterol, acted as an intermediary. Higher levels of Bifidobacteriales reduced the presence of these cholesterol-related fats in the bloodstream, which in turn correlated with an increased risk of postpartum depression.

The epigenetic analysis revealed seven specific genes involved in metabolism that appear to be regulated by DNA methylation in connection with the disease. One primary focus was a gene that produces an enzyme called ferredoxin reductase. This enzyme helps the body manufacture steroid hormones and other cellular compounds.

The results indicated that lower levels of DNA methylation near this gene led to increased enzyme production. This increase in the enzyme actually seemed to protect against postpartum depression. The researchers found that genetic variations affecting this enzyme also influenced the abundance of the Bifidobacterium genus in the gut.

Other identified genes govern different cellular networks, like the synthesis of creatine for brain energy or the transport of amino acids. For example, the analysis suggested that increased activity of a gene responsible for transporting the amino acid cysteine raises the susceptibility to postpartum depression. Another gene, which initiates signaling pathways for cell survival, also appeared to elevate disease risk when highly active.

An enzyme associated with synthesizing creatine emerged as another important factor. Elevated expression of the gene responsible for this enzyme showed a protective effect against postpartum depression. The analysis indicated that epigenetic methylation likely suppresses this gene, thereby increasing the vulnerability to maternal mood disorders.

Despite the extensive data, the study relies on observational genetic statistics rather than direct experiments. The Mendelian randomization method provides mathematically robust hypotheses, but it cannot completely confirm direct biochemical reactions in the human body. Actual confirmation requires physical laboratory tests and clinical trials.

The investigators noted that the genetic databases were predominantly derived from populations of European ancestry. This lack of diversity restricts the ability to generalize the results to other ethnic groups, who might possess different genetic and microbial profiles. The datasets for the gut microbiome also included general population data rather than being exclusive to postpartum individuals.

The researchers acknowledged that they could only categorize bacteria at the broader genus level because of database limitations. Different individual species within a single genus can sometimes have opposite biological effects. Future research will need to use more precise sequencing tools to identify the exact bacterial strains involved in maternal health.

Currently, traditional antidepressant treatments for postpartum depression carry limitations. These medications can take weeks to become effective and often produce adverse side effects that concern parents who are breastfeeding. Moving forward, scientists hope to recreate these microbial frameworks in animal models to watch the biological processes in real time.

Mapping out these specific bacteria and lipid pathways opens the door for targeted therapies. Specialized probiotics or dietary interventions might one day help balance the gut and prevent postpartum depression without relying entirely on traditional medications.

The study, “Host gut microbial metabolic crosstalk in postpartum depression: A multiomics insight linking blood metabolites to epigenetic modulation,” was authored by Zhiyuan Zhang, Xiaobing Hu, Weimin Tao, Ruijing Ma, Yuhan Zheng, Xin Fang, Jiameng Gao, and Zhendong Xu.

URL: https://www.psypost.org/how-gut-bacteria-change-genetic-switches-to-influence-postpartum-depression/

-------------------------------------------------

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NYU Information for Practice puts out 400-500 good quality health-related research posts per week but its too much for many people, so that bot is limited to just subscribers. You can read it or subscribe at @PsychResearchBot

Since 1991 The National Psychologist has focused on keeping practicing psychologists current with news, information and items of interest. Check them out for more free articles, resources, and subscription information: https://www.nationalpsychologist.com

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It's primitive... but it works... mostly...

-------------------------------------------------

#psychology #counseling #socialwork #psychotherapy @psychotherapist @psychotherapists @psychology @socialpsych @socialwork @psychiatry #mentalhealth #psychiatry #healthcare #depression #psychotherapist #PostpartumDepression #GutBrainAxis #MicrobiomeHealth #Bifidobacteriales #Clostridia #Verrucomicrobia #GutMetabolites #Epigenetics #MendelianRandomization #MaternalMentalHealth

DATE: May 20, 2026 at 12:00PM
SOURCE: PSYPOST.ORG

** Research quality varies widely from fantastic to small exploratory studies. Please check research methods when conclusions are very important to you. **
-------------------------------------------------

TITLE: Can gut bacteria cause postpartum depression?

URL: https://www.psypost.org/how-gut-bacteria-change-genetic-switches-to-influence-postpartum-depression/

Recent research suggests a potential causal link between specific gut bacteria, blood metabolism, and the development of postpartum depression. By analyzing massive genetic databases, scientists mapped how microbial communities alter genetic switches and cholesterol levels to influence maternal mental health. The findings were published in the Journal of Affective Disorders.

Postpartum depression affects roughly 14 percent of people after giving birth. The condition impacts maternal quality of life and infant attachment. Currently, treatments remain limited because the biological mechanisms driving the disorder are not entirely understood. By the time symptoms emerge, physicians have few tools to reverse the condition.

Emerging evidence points toward the gut microbiome as a major factor in mood and brain health. Trillions of bacteria living in the digestive tract produce chemicals that communicate with the brain. This connection is often called the gut-brain axis. It regulates everything from immune responses to the maintenance of the blood-brain barrier.

Under normal conditions, intestinal microbes also facilitate the production of neurotransmitters like serotonin and essential energy sources called short-chain fatty acids. During pregnancy and after childbirth, the maternal digestive system undergoes profound remodeling. Researchers suspect that shifts in this bacterial landscape alter the ways the body processes hormones, steroids, and energy.

Zhiyuan Zhang, a researcher at Tongji University in Shanghai, and colleagues sought to map how these gut microbes interact with the host’s metabolism. They wanted to see if specific bacteria drive postpartum depression through blood metabolites and genetic switches.

To investigate this chain of events without the confounding factors of clinical trials, Zhang and colleagues used a technique known as Mendelian randomization. This approach relies on the natural, random assortment of genetic variations passed down during conception. Scientists use these genetic differences as a proxy to test if a specific exposure actually causes a disease, rather than just appearing alongside it.

Because genes are inherited randomly and cannot be altered by a person’s diet or environment later in life, they serve as an objective anchor for observing biological cause and effect. It allows researchers to bypass lifestyle differences that usually obscure nutritional and microbial studies.

The team pulled information from multiple large-scale global databases. They integrated genetic details from the MiBioGen consortium, a massive database covering tens of thousands of individuals, looking at genetic variations linked to the abundance of specific gut bacteria. They then cross-referenced these variations with genetic data from the FinnGen consortium, which included over 13,000 women who had experienced postpartum depression.

In another phase of the study, the investigators looked for biological mediators in the blood. They searched for circulating molecules that might carry signals from the gut to the brain by examining the UK Biobank dataset. In total, they examined 249 different measures of lipids, fatty acids, and small molecules like amino acids.

Finally, they assessed epigenetic factors, which are chemical tags on DNA that turn gene activity up or down without changing the genetic code itself. Specifically, the researchers examined DNA methylation, a process where tiny chemical clusters attach to genes to modify how much of a certain protein the body produces. They analyzed whether variations in these methylation patterns in blood tissue overlapped with the genetic risks for postpartum depression and gut bacteria levels.

The researchers identified totally different roles for various groups of bacteria. Six bacterial groups were associated with an elevated risk of developing postpartum depression. These included the class Clostridia, the order Bifidobacteriales, and several specific genera like Eggerthella. Conversely, a group known as the phylum Verrucomicrobia appeared to exert a protective effect against the disorder.

The team then traced how some of these bacteria influence mental health by looking at blood chemistry. They found that certain fats connected to high-density lipoprotein, commonly known as good cholesterol, acted as an intermediary. Higher levels of Bifidobacteriales reduced the presence of these cholesterol-related fats in the bloodstream, which in turn correlated with an increased risk of postpartum depression.

The epigenetic analysis revealed seven specific genes involved in metabolism that appear to be regulated by DNA methylation in connection with the disease. One primary focus was a gene that produces an enzyme called ferredoxin reductase. This enzyme helps the body manufacture steroid hormones and other cellular compounds.

The results indicated that lower levels of DNA methylation near this gene led to increased enzyme production. This increase in the enzyme actually seemed to protect against postpartum depression. The researchers found that genetic variations affecting this enzyme also influenced the abundance of the Bifidobacterium genus in the gut.

Other identified genes govern different cellular networks, like the synthesis of creatine for brain energy or the transport of amino acids. For example, the analysis suggested that increased activity of a gene responsible for transporting the amino acid cysteine raises the susceptibility to postpartum depression. Another gene, which initiates signaling pathways for cell survival, also appeared to elevate disease risk when highly active.

An enzyme associated with synthesizing creatine emerged as another important factor. Elevated expression of the gene responsible for this enzyme showed a protective effect against postpartum depression. The analysis indicated that epigenetic methylation likely suppresses this gene, thereby increasing the vulnerability to maternal mood disorders.

Despite the extensive data, the study relies on observational genetic statistics rather than direct experiments. The Mendelian randomization method provides mathematically robust hypotheses, but it cannot completely confirm direct biochemical reactions in the human body. Actual confirmation requires physical laboratory tests and clinical trials.

The investigators noted that the genetic databases were predominantly derived from populations of European ancestry. This lack of diversity restricts the ability to generalize the results to other ethnic groups, who might possess different genetic and microbial profiles. The datasets for the gut microbiome also included general population data rather than being exclusive to postpartum individuals.

The researchers acknowledged that they could only categorize bacteria at the broader genus level because of database limitations. Different individual species within a single genus can sometimes have opposite biological effects. Future research will need to use more precise sequencing tools to identify the exact bacterial strains involved in maternal health.

Currently, traditional antidepressant treatments for postpartum depression carry limitations. These medications can take weeks to become effective and often produce adverse side effects that concern parents who are breastfeeding. Moving forward, scientists hope to recreate these microbial frameworks in animal models to watch the biological processes in real time.

Mapping out these specific bacteria and lipid pathways opens the door for targeted therapies. Specialized probiotics or dietary interventions might one day help balance the gut and prevent postpartum depression without relying entirely on traditional medications.

The study, “Host gut microbial metabolic crosstalk in postpartum depression: A multiomics insight linking blood metabolites to epigenetic modulation,” was authored by Zhiyuan Zhang, Xiaobing Hu, Weimin Tao, Ruijing Ma, Yuhan Zheng, Xin Fang, Jiameng Gao, and Zhendong Xu.

URL: https://www.psypost.org/how-gut-bacteria-change-genetic-switches-to-influence-postpartum-depression/

-------------------------------------------------

DAILY EMAIL DIGEST: Email [email protected] -- no subject or message needed.

Private, vetted email list for mental health professionals: https://www.clinicians-exchange.org

Unofficial Psychology Today Xitter to toot feed at Psych Today Unofficial Bot @PTUnofficialBot

NYU Information for Practice puts out 400-500 good quality health-related research posts per week but its too much for many people, so that bot is limited to just subscribers. You can read it or subscribe at @PsychResearchBot

Since 1991 The National Psychologist has focused on keeping practicing psychologists current with news, information and items of interest. Check them out for more free articles, resources, and subscription information: https://www.nationalpsychologist.com

EMAIL DAILY DIGEST OF RSS FEEDS -- SUBSCRIBE: http://subscribe-article-digests.clinicians-exchange.org

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It's primitive... but it works... mostly...

-------------------------------------------------

#psychology #counseling #socialwork #psychotherapy @psychotherapist @psychotherapists @psychology @socialpsych @socialwork @psychiatry #mentalhealth #psychiatry #healthcare #depression #psychotherapist #PostpartumDepression #GutBrainAxis #MicrobiomeHealth #Bifidobacteriales #Clostridia #Verrucomicrobia #GutMetabolites #Epigenetics #MendelianRandomization #MaternalMentalHealth

DATE: May 20, 2026 at 12:00PM
SOURCE: PSYPOST.ORG

** Research quality varies widely from fantastic to small exploratory studies. Please check research methods when conclusions are very important to you. **
-------------------------------------------------

TITLE: Can gut bacteria cause postpartum depression?

URL: https://www.psypost.org/how-gut-bacteria-change-genetic-switches-to-influence-postpartum-depression/

Recent research suggests a potential causal link between specific gut bacteria, blood metabolism, and the development of postpartum depression. By analyzing massive genetic databases, scientists mapped how microbial communities alter genetic switches and cholesterol levels to influence maternal mental health. The findings were published in the Journal of Affective Disorders.

Postpartum depression affects roughly 14 percent of people after giving birth. The condition impacts maternal quality of life and infant attachment. Currently, treatments remain limited because the biological mechanisms driving the disorder are not entirely understood. By the time symptoms emerge, physicians have few tools to reverse the condition.

Emerging evidence points toward the gut microbiome as a major factor in mood and brain health. Trillions of bacteria living in the digestive tract produce chemicals that communicate with the brain. This connection is often called the gut-brain axis. It regulates everything from immune responses to the maintenance of the blood-brain barrier.

Under normal conditions, intestinal microbes also facilitate the production of neurotransmitters like serotonin and essential energy sources called short-chain fatty acids. During pregnancy and after childbirth, the maternal digestive system undergoes profound remodeling. Researchers suspect that shifts in this bacterial landscape alter the ways the body processes hormones, steroids, and energy.

Zhiyuan Zhang, a researcher at Tongji University in Shanghai, and colleagues sought to map how these gut microbes interact with the host’s metabolism. They wanted to see if specific bacteria drive postpartum depression through blood metabolites and genetic switches.

To investigate this chain of events without the confounding factors of clinical trials, Zhang and colleagues used a technique known as Mendelian randomization. This approach relies on the natural, random assortment of genetic variations passed down during conception. Scientists use these genetic differences as a proxy to test if a specific exposure actually causes a disease, rather than just appearing alongside it.

Because genes are inherited randomly and cannot be altered by a person’s diet or environment later in life, they serve as an objective anchor for observing biological cause and effect. It allows researchers to bypass lifestyle differences that usually obscure nutritional and microbial studies.

The team pulled information from multiple large-scale global databases. They integrated genetic details from the MiBioGen consortium, a massive database covering tens of thousands of individuals, looking at genetic variations linked to the abundance of specific gut bacteria. They then cross-referenced these variations with genetic data from the FinnGen consortium, which included over 13,000 women who had experienced postpartum depression.

In another phase of the study, the investigators looked for biological mediators in the blood. They searched for circulating molecules that might carry signals from the gut to the brain by examining the UK Biobank dataset. In total, they examined 249 different measures of lipids, fatty acids, and small molecules like amino acids.

Finally, they assessed epigenetic factors, which are chemical tags on DNA that turn gene activity up or down without changing the genetic code itself. Specifically, the researchers examined DNA methylation, a process where tiny chemical clusters attach to genes to modify how much of a certain protein the body produces. They analyzed whether variations in these methylation patterns in blood tissue overlapped with the genetic risks for postpartum depression and gut bacteria levels.

The researchers identified totally different roles for various groups of bacteria. Six bacterial groups were associated with an elevated risk of developing postpartum depression. These included the class Clostridia, the order Bifidobacteriales, and several specific genera like Eggerthella. Conversely, a group known as the phylum Verrucomicrobia appeared to exert a protective effect against the disorder.

The team then traced how some of these bacteria influence mental health by looking at blood chemistry. They found that certain fats connected to high-density lipoprotein, commonly known as good cholesterol, acted as an intermediary. Higher levels of Bifidobacteriales reduced the presence of these cholesterol-related fats in the bloodstream, which in turn correlated with an increased risk of postpartum depression.

The epigenetic analysis revealed seven specific genes involved in metabolism that appear to be regulated by DNA methylation in connection with the disease. One primary focus was a gene that produces an enzyme called ferredoxin reductase. This enzyme helps the body manufacture steroid hormones and other cellular compounds.

The results indicated that lower levels of DNA methylation near this gene led to increased enzyme production. This increase in the enzyme actually seemed to protect against postpartum depression. The researchers found that genetic variations affecting this enzyme also influenced the abundance of the Bifidobacterium genus in the gut.

Other identified genes govern different cellular networks, like the synthesis of creatine for brain energy or the transport of amino acids. For example, the analysis suggested that increased activity of a gene responsible for transporting the amino acid cysteine raises the susceptibility to postpartum depression. Another gene, which initiates signaling pathways for cell survival, also appeared to elevate disease risk when highly active.

An enzyme associated with synthesizing creatine emerged as another important factor. Elevated expression of the gene responsible for this enzyme showed a protective effect against postpartum depression. The analysis indicated that epigenetic methylation likely suppresses this gene, thereby increasing the vulnerability to maternal mood disorders.

Despite the extensive data, the study relies on observational genetic statistics rather than direct experiments. The Mendelian randomization method provides mathematically robust hypotheses, but it cannot completely confirm direct biochemical reactions in the human body. Actual confirmation requires physical laboratory tests and clinical trials.

The investigators noted that the genetic databases were predominantly derived from populations of European ancestry. This lack of diversity restricts the ability to generalize the results to other ethnic groups, who might possess different genetic and microbial profiles. The datasets for the gut microbiome also included general population data rather than being exclusive to postpartum individuals.

The researchers acknowledged that they could only categorize bacteria at the broader genus level because of database limitations. Different individual species within a single genus can sometimes have opposite biological effects. Future research will need to use more precise sequencing tools to identify the exact bacterial strains involved in maternal health.

Currently, traditional antidepressant treatments for postpartum depression carry limitations. These medications can take weeks to become effective and often produce adverse side effects that concern parents who are breastfeeding. Moving forward, scientists hope to recreate these microbial frameworks in animal models to watch the biological processes in real time.

Mapping out these specific bacteria and lipid pathways opens the door for targeted therapies. Specialized probiotics or dietary interventions might one day help balance the gut and prevent postpartum depression without relying entirely on traditional medications.

The study, “Host gut microbial metabolic crosstalk in postpartum depression: A multiomics insight linking blood metabolites to epigenetic modulation,” was authored by Zhiyuan Zhang, Xiaobing Hu, Weimin Tao, Ruijing Ma, Yuhan Zheng, Xin Fang, Jiameng Gao, and Zhendong Xu.

URL: https://www.psypost.org/how-gut-bacteria-change-genetic-switches-to-influence-postpartum-depression/

-------------------------------------------------

DAILY EMAIL DIGEST: Email [email protected] -- no subject or message needed.

Private, vetted email list for mental health professionals: https://www.clinicians-exchange.org

Unofficial Psychology Today Xitter to toot feed at Psych Today Unofficial Bot @PTUnofficialBot

NYU Information for Practice puts out 400-500 good quality health-related research posts per week but its too much for many people, so that bot is limited to just subscribers. You can read it or subscribe at @PsychResearchBot

Since 1991 The National Psychologist has focused on keeping practicing psychologists current with news, information and items of interest. Check them out for more free articles, resources, and subscription information: https://www.nationalpsychologist.com

EMAIL DAILY DIGEST OF RSS FEEDS -- SUBSCRIBE: http://subscribe-article-digests.clinicians-exchange.org

READ ONLINE: http://read-the-rss-mega-archive.clinicians-exchange.org

It's primitive... but it works... mostly...

-------------------------------------------------

#psychology #counseling #socialwork #psychotherapy @psychotherapist @psychotherapists @psychology @socialpsych @socialwork @psychiatry #mentalhealth #psychiatry #healthcare #depression #psychotherapist #PostpartumDepression #GutBrainAxis #MicrobiomeHealth #Bifidobacteriales #Clostridia #Verrucomicrobia #GutMetabolites #Epigenetics #MendelianRandomization #MaternalMentalHealth

Genetic insights into causal effects of lipids and lipid-modifying targets on calcific aortic valve stenosis: a Mendelian randomized study

Genetic variant…
#NewsBeep #News #US #USA #UnitedStates #UnitedStatesOfAmerica #Genetics #Calcificaorticvalvestenosis #Cardiovasculargenetics #Epidemiology #eQTL #Geneticsresearch #HumanitiesandSocialSciences #LDL-C #Lipidsprofile #Mendelianrandomization #multidisciplinary #PCSK9 #pQTL #Riskfactors #Science #Valvulardisease
https://www.newsbeep.com/us/76452/

Genetic insights into causal effects of lipids and lipid-modifying targets on calcific aortic valve stenosis: a Mendelian randomized study

Genetic variant…
#NewsBeep #News #US #USA #UnitedStates #UnitedStatesOfAmerica #Genetics #Calcificaorticvalvestenosis #Cardiovasculargenetics #Epidemiology #eQTL #Geneticsresearch #HumanitiesandSocialSciences #LDL-C #Lipidsprofile #Mendelianrandomization #multidisciplinary #PCSK9 #pQTL #Riskfactors #Science #Valvulardisease
https://www.newsbeep.com/us/76452/

STATGEN 2024 talk
Identifying GxE through Mendelian Randomization
Xiaofeng Zhu

Statistical power is low and detecting GxE is a challenge.

See:

Aschard H. A perspective on interaction effects in genetic association studies. Genet Epidemiol. 2016 Dec;40(8):678-688. doi: 10.1002/gepi.21989. Epub 2016 Jul 7. PMID: 27390122; PMCID: PMC5132101.

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#Genetics #STATGEN2024 #StatisticalGenetics #MendelianRandomization

STATGEN 2024 talk
An efficient method for network Mendelian randomization allows network structure discovery and effect estimation.
Jean Morrison

Existing methods

* GenomicSEM
* Network deconvolution
Graph-cML
bimmer

Our method

* Network empirical shrinkage Mendelian randomization (NESMR)
- likelihood-based

Assumptions
1. Causal effects between traits are linear with no interactions

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#Genetics #MendelianRandomization #STATGEN2024 #StatisticalGenetics

STATGEN 2024
Pleiotropy-robust methods for high-dimensional multivariable Mendelian randomization (HDMR)
Nathan LaPierre presenting, co-authors: Matthew Stephens, Xin He

In HDMR, we have many genetically correlated exposures, which may be explained by unobserved shared factors. These can be inferred by factor analysis.

Flexible, modular framework: Factor-Augmented MR
1. Factor Analysis
2. Regression/Variable Selection

#Genetics #StatisticalGenetics #MendelianRandomization #STATGEN2024

https://x.com/michelnivard/status/1511001311755575305?s=12 great thread on limitations of #Mendelianrandomization

https://link.springer.com/article/10.1007/s10654-021-00726-8 #Mendelianrandomization

@jessica if you mean using #MendelianRandomization to pretend your analysis can assess #Causation in a reproducible way then no, you should have used a different study design.

In the nicest possible way, if you're posting this because you're actually experiencing a crisis then I apologize for being flip and please tell me if I can help you in some way.

#BloodPressure Highly Likely to Cause #Neurotic Personality Trait - https://neurosciencenews.com/blood-pressure-neuroticism-21906/… via
@neurosciencenew

#MendelianRandomization #Psychiatry

"#diastolic blood pressure was significantly associated with #neuroticism (over 90%), based on 1074 #SNP's."