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Researchers mapped structural variants (SVs) in rhesus macaques, identifying human-specific inversions that impact brain development and cognitive abilities. This study clarifies genetic differences underlying human uniqueness.

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Area of Science:

  • Genomics
  • Evolutionary Biology
  • Primate Genetics

Background:

  • Structural variants (SVs) in nonhuman primates are crucial for understanding human-specific traits but are underrepresented in research.
  • Accurate SV maps are needed to investigate genetic variations and their functional impacts.

Purpose of the Study:

  • To create a comprehensive SV map in rhesus macaques.
  • To identify and prioritize functional human-specific inversions.
  • To explore the role of these inversions in human brain development and cognitive evolution.

Main Methods:

  • Generated an accurate SV map using long-read sequencing data from 562 rhesus macaques.
  • Validated SV calls using in-house benchmarks of multiple macaque genomes.
  • Identified and prioritized 75 human-specific inversions based on functional constraints.

Main Results:

  • The macaque SV map revealed stronger selective constraints on inversions within regulatory regions.
  • Prioritized human-specific inversions significantly altered the human transcriptome.
  • These inversions reconfigured ancestral genomic architecture and introduced mutation hotspots.
  • Linked theAPCDD1 gene, located on a human-specific inversion, to neuronal maturation and cognitive ability.

Conclusions:

  • Structural variants, particularly inversions, play a significant role in shaping human uniqueness.
  • Inversions contribute to human brain development and cognitive evolution by altering gene regulation and genomic architecture.
  • This study provides a valuable resource for understanding primate genomics and human evolution.