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Anatomy of the Brain: Major Regions01:20

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The brain is the most complex organ in the human body. It consists of four main parts: the cerebrum, diencephalon, cerebellum, and brainstem.
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On Expression Patterns and Developmental Origin of Human Brain Regions.

Lior Kirsch1, Gal Chechik1

  • 1The Gonda Multidisciplinary Brain Research Center, Bar-Ilan University, Ramat Gan, Israel.

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Most human genes (92%) show expression patterns aligning with developmental brain regions. This agreement, influenced by gene type and evolutionary age, persists throughout life, reflecting developmental origins.

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Area of Science:

  • Neuroscience
  • Genomics
  • Developmental Biology

Background:

  • Brain regions possess distinct cell types and circuitry reflected in gene expression.
  • Adult rodent studies show transcriptome patterns correlate with embryonic origin, but human data is limited.
  • Understanding how developmental signatures are maintained and evolve in the human brain is crucial.

Purpose of the Study:

  • To quantify gene expression patterns in the adult human brain related to developmental origin.
  • To investigate how these expression patterns change across developmental phases.
  • To explore the relationship between gene similarity, expression correlation, and developmental signatures.

Main Methods:

  • Genome-wide mRNA expression analysis of post-mortem adult human brain tissue.
  • Comparison of gene expression profiles with developmental brain region ontology.
  • Analysis of gene pairs' similarity and spatial correlation strength.

Main Results:

  • 92% of human genes exhibit expression patterns consistent with developmental brain region ontology.
  • This agreement varies across developmental stages and is strong in neuron-specific genes and early-evolved genes.
  • Gene pairs with high developmental agreement show stronger correlations, with spatial correlation changing more in those with stronger embryonic signatures.

Conclusions:

  • Spatial gene expression in the adult human brain is largely tuned by developmental origins.
  • This developmental tuning is dynamic, changing throughout life.
  • The findings suggest a persistent influence of early developmental programs on adult brain gene regulation.