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Nat Ecol Evol. 2017;1(3):69. doi: 10.1038/s41559-016-0069. Epub 2017 Feb 17.

The evolution and population diversity of human-specific segmental duplications.

Author information

1
Genome Center, MIND Institute, and Department of Biochemistry & Molecular Medicine, University of California, Davis, CA 95616, USA.
2
Department of Genome Sciences, University of Washington School of Medicine, Seattle, WA 98195, USA.
3
Howard Hughes Medical Institute, University of Washington, Seattle, WA 98195, USA.
4
Dipartimento di Biologia, Università degli Studi di Bari "Aldo Moro", Bari 70125, Italy.
5
McDonnell Genome Institute at Washington University, Washington University School of Medicine, St. Louis, MO 63108, USA.

Abstract

Segmental duplications contribute to human evolution, adaptation and genomic instability but are often poorly characterized. We investigate the evolution, genetic variation and coding potential of human-specific segmental duplications (HSDs). We identify 218 HSDs based on analysis of 322 deeply sequenced archaic and contemporary hominid genomes. We sequence 550 human and nonhuman primate genomic clones to reconstruct the evolution of the largest, most complex regions with protein-coding potential (n=80 genes/33 gene families). We show that HSDs are non-randomly organized, associate preferentially with ancestral ape duplications termed "core duplicons", and evolved primarily in an interspersed inverted orientation. In addition to Homo sapiens-specific gene expansions (e.g., TCAF1/2), we highlight ten gene families (e.g., ARHGAP11B and SRGAP2C) where copy number never returns to the ancestral state, there is evidence of mRNA splicing, and no common gene-disruptive mutations are observed in the general population. Such duplicates are candidates for the evolution of human-specific adaptive traits.

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