Multicopy gene family evolution on primate Y chromosomes

Area of Science:

• Genomics
• Evolutionary Biology
• Molecular Biology

Background:

• The primate Y chromosome has limited recombination, gene loss, and repetitive elements.
• Ampliconic genes, found in multiple copies on the Y chromosome, undergo gene conversion for homogenization.
• Understanding ampliconic gene family evolution is crucial for primate evolutionary studies.

Purpose of the Study:

• To investigate the evolution of ampliconic gene families in papionin monkeys.
• To test for evidence of gene conversion in these gene families.
• To develop a statistical framework for evaluating models of gene family evolution.

Main Methods:

• Collected nucleotide sequence and gene copy number data for papionin monkeys.
• Analyzed data for evidence of gene conversion.
• Developed a novel statistical framework to compare gene family evolution models.

Main Results:

• Identified novel instances of gene conversion in papionin monkeys.
• Found that ampliconic gene families exhibit faster evolution than autosomal or Y-linked single-copy genes.
• Observed accelerated evolution of Y-linked and autosomal genes in humans and chimpanzees compared to other Old World monkeys.

Conclusions:

• Rapid evolution of ampliconic genes is influenced by factors beyond Y chromosome location.
• Natural selection and gene conversion are key drivers of evolutionary heterogeneity in primate gene families.
• The study highlights the complex evolutionary dynamics of Y-linked genes.