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Comprehensive transcriptomic analysis indicates brain regional specific alterations in type 2 diabetes.

Zhe Zhou1,2, Yizhang Zhu1,2, Yang Liu2

  • 1Institute of Systems Biomedicine, School of Basic Medical Sciences, Peking University Health Science Center, Beijing 100191, China.

Aging
|August 27, 2019
PubMed
Summary
This summary is machine-generated.

Type 2 diabetes (T2D) significantly alters brain gene expression, particularly in the caudate and hippocampus. This study reveals molecular insights into T2D-related brain disorders and neurodegeneration.

Keywords:
braincaudateco-expression networktranscriptometype 2 diabetes

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Area of Science:

  • Neuroscience
  • Genomics
  • Endocrinology

Background:

  • Type 2 diabetes (T2D) is linked to various comorbidities, including brain disorders.
  • The molecular mechanisms underlying T2D's impact on the brain remain largely unknown.

Purpose of the Study:

  • To investigate the transcriptomic differences in thirteen human brain regions between individuals with and without T2D.
  • To identify molecular pathways and genes associated with T2D in the brain.

Main Methods:

  • Comprehensive transcriptomic analysis of 304 T2D and 608 control brain samples across thirteen regions.
  • Functional enrichment analysis and co-expression network analysis of differentially expressed genes.
  • Analysis of T2D risk single nucleotide polymorphisms (SNPs) in relation to identified gene modules.

Main Results:

  • Significant transcriptomic alterations were observed in T2D brains, most prominently in the caudate and hippocampus.
  • Functional analysis indicated impaired synaptic functions and links to neurodegenerative diseases.
  • A T2D-disorganized co-expression module in the caudate was identified, enriched with T2D risk SNPs, implicating genes like NSF and ADD2.

Conclusions:

  • Transcriptomic profiles of brain regions differ substantially in Type 2 diabetes.
  • The study provides molecular evidence linking T2D to synaptic dysfunction and neurodegeneration, particularly in the caudate nucleus.
  • Identified gene modules and hub genes offer potential targets for understanding and treating T2D-associated brain disorders.