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An Education Doesn’t Just Make You Smarter, It Protects Your Gut – Neuroscience News


Summary: Better education has a strong genetic correlation and protective causal association against several disorders that affect the gut, a new study reports.

Source: Edith Cowan University

We’ve long known education is important for many aspects of life, but now a new benefit has been discovered: it can look after your gut health.

Landmark Edith Cowan University (ECU) research has found a better education has a strong genetic correlation and a protective causal association with several gut disorders.

A previous study from ECU’s Centre for Precision Health (CPH) discovered a genetic link between gut health and Alzheimer’s Disease (AD) but couldn’t conclude whether one caused the other.

This study breaks new ground by finding that a higher level of education protects against gut disorders.

CPH Director and study supervisor Professor Simon Laws said these findings build upon the centre’s previous work to provide further evidence of the strong links between the brain and gut, known as the gut-brain axis.

“Gut disorders and Alzheimer’s may not only share a common genetic predisposition but may be similarly influenced by genetic variations underpinning educational attainment,” Professor Laws said.

This large-scale study examined the genetic information of more than 766,000 individuals, with an emphasis on AD, cognitive traits and gut disorders, including peptic ulcer disease (PUD), gastritis-duodenitis, gastroesophageal reflux disease (GERD), irritable bowel syndrome, diverticulosis and inflammatory bowel disease (IBD).

It found higher levels of education and cognitive functioning reduced the risk of gut disorders.

Lead researcher Dr Emmanuel Adewuyi said the findings have significant implications.

“The results support education as a possible avenue for reducing the risk of gut disorders

by, for example, encouraging higher educational attainment or a possible increase in the length of schooling,” he said.

“Hence, policy efforts aimed at increasing educational attainment or cognitive training may contribute to a higher level of intelligence, which could lead to better health outcomes including a reduced risk of gut disorders.”

It goes both ways

ECU’s study further revealed the gut may also influence the brain.

GERD showed evidence of causing a decline in cognitive function across a number of cognitive traits assessed in the study, such as intelligence, cognitive performance, educational attainment and educational qualification.

Although this is the first study to report this finding, the results support recent research reporting an increased incidence of dementia and GERD, which Dr Adewuyi said could help with earlier diagnoses and potential treatments.

“GERD may be a risk factor for cognitive impairment, so it’s important for health workers to look for signs or symptoms of cognitive dysfunction in patients presenting with the gut disorder,” he said.

“This could lead to earlier detection of cognitive decline and therefore earlier interventions aimed at reducing the rate of cognitive decline.

“More studies are needed to investigate whether treatment for, cure or remission of GERD can contribute to a reduced risk of cognitive decline.”

The curious case of IBD

Interestingly, higher levels of education and cognitive function protecting against gut disorders was true of all the disorders examined in the study — but largely with the exception of inflammatory bowel disease.

Further analysis reveals different effects of IBD on cognitive traits and AD at different genomic locations, indicating its relationship depend on effects at specific locations across the genome.

This new understanding may explain the lack of significant genetic correlation of IBD with cognitive traits and AD, and the inconsistency reported in previous observational studies.

Dr Adewuyi said this finding was also important, as it brings a new insight into the relationship of IBD with cognitive traits (and AD), which may shape the direction of future studies.

“For example, some risk genes for AD may be protective against IBD, and vice versa,” he said.

About this gut health research news

Author: Sam Jeremic
Source: Edith Cowan University
Contact: Sam Jeremic – Edith Cowan University
Image: The image is in the public domain

Original Research: Open access.
Relationship of Cognition and Alzheimer’s Disease with Gastrointestinal Tract Disorders: A Large-Scale Genetic Overlap and Mendelian Randomisation Analysis” by Simon Laws et al. International Journal of Molecular Sciences

Relationship of Cognition and Alzheimer’s Disease with Gastrointestinal Tract Disorders: A Large-Scale Genetic Overlap and Mendelian Randomisation Analysis

Emerging observational evidence suggests links between cognitive impairment and a range of gastrointestinal tract (GIT) disorders; however, the mechanisms underlying their relationships remain unclear. Leveraging large-scale genome-wide association studies’ summary statistics, we comprehensively assessed genetic overlap and potential causality of cognitive traits and Alzheimer’s disease (AD) with several GIT disorders.

We demonstrate a strong and highly significant inverse global genetic correlation between cognitive traits and GIT disorders—peptic ulcer disease (PUD), gastritis-duodenitis, diverticulosis, irritable bowel syndrome, and gastroesophageal reflux disease (GERD), but not inflammatory bowel disease (IBD). Further analysis detects 35 significant (p < 4.37 × 10−5) bivariate local genetic correlations between cognitive traits, AD, and GIT disorders (including IBD).

Mendelian randomisation analysis suggests a risk-decreasing causality of educational attainment, intelligence, and other cognitive traits on PUD and GERD, but not IBD, and a putative association of GERD with cognitive function decline.

Gene-based analysis reveals a significant gene-level genetic overlap of cognitive traits with AD and GIT disorders (IBD inclusive, pbinomial-test = 1.18 × 10−3–2.20 × 10−16). Our study supports the protective roles of genetically-influenced educational attainments and other cognitive traits on the risk of GIT disorders and highlights a putative association of GERD with cognitive function decline.

Findings from local genetic correlation analysis provide novel insights, indicating that the relationship of IBD with cognitive traits (and AD) will depend largely on their local effects across the genome.

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