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Human-specific gene expansions contribute to brain evolution.

Daniela C Soto1, José M Uribe-Salazar1, Gulhan Kaya1

  • 1Department of Biochemistry & Molecular Medicine, MIND Institute, University of California, Davis, Davis, CA 95616, USA; Genome Center, University of California, Davis, Davis, CA 95616, USA.

Cell
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PubMed
Summary
This summary is machine-generated.

Human-specific gene duplications are key to brain evolution. Researchers identified 362 paralogs in all humans, with two genes, GPR89B and FRMPD2B, showing potential roles in human brain development and features.

Keywords:
braincopy-number variationgene duplicationsgene expressionhuman evolutionnatural selectionneurodevelopmentsegmental duplicationssequencingzebrafish

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Area of Science:

  • Genomics
  • Evolutionary Biology
  • Neuroscience

Background:

  • Gene duplication events in the human lineage are hypothesized to drive brain evolution.
  • Identifying these duplicated genes is challenging due to genome assembly errors.

Purpose of the Study:

  • To identify human-specific gene families and paralogs contributing to universal human brain features.
  • To investigate the functional roles of these genes in brain development.

Main Methods:

  • Utilized a complete telomere-to-telomere genome sequence for gene discovery.
  • Employed long-read DNA sequencing to detect signatures of selection in modern human genomes.
  • Generated zebrafish CRISPR knockout models and performed mRNA humanization experiments.

Main Results:

  • Identified 213 human-specific gene families, with 362 paralogs present in all tested modern human genomes and brain transcriptomes.
  • Detected signatures of selection in specific paralogs, including CD8B.
  • Implicated GPR89B in dosage-dependent brain expansion and FRMPD2B in altered synapse signaling in zebrafish models.

Conclusions:

  • The study provides a comprehensive resource for understanding gene expansion in human brain evolution.
  • GPR89B and FRMPD2B are highlighted as potential contributors to distinct human brain characteristics.