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Using the Neandertal genome to study the evolution of small insertions and deletions in modern humans.

Abstract：

BACKGROUND:Small insertions and deletions occur in humans at a lower rate compared to nucleotide changes, but evolve under more constraint than nucleotide changes. While the evolution of insertions and deletions have been investigated using ape outgroups, the now available genome of a Neandertal can shed light on the evolution of indels in more recent times. RESULTS:We used the Neandertal genome together with several primate outgroup genomes to differentiate between human insertion/deletion changes that likely occurred before the split from Neandertals and those that likely arose later. Changes that pre-date the split from Neandertals show a smaller proportion of deletions than those that occurred later. The presence of a Neandertal-shared allele in Europeans or Asians but the absence in Africans was used to detect putatively introgressed indels in Europeans and Asians. A larger proportion of these variants reside in intergenic regions compared to other modern human variants, and some variants are linked to SNPs that have been associated with traits in modern humans. CONCLUSIONS:Our results are in agreement with earlier results that suggested that deletions evolve under more constraint than insertions. When considering Neandertal introgressed variants, we find some evidence that negative selection affected these variants more than other variants segregating in modern humans. Among introgressed variants we also identify indels that may influence the phenotype of their carriers. In particular an introgressed deletion associated with a decrease in the time to menarche may constitute an example of a former Neandertal-specific trait contributing to modern human phenotypic diversity.

journal_name

BMC Evol Biol

journal_title

BMC evolutionary biology

authors

Chintalapati M,Dannemann M,Prüfer K

doi

10.1186/s12862-017-1018-8

subject

Has Abstract

pub_date

2017-08-04 00:00:00

pages

179

issue

1

issn

1471-2148

pii

10.1186/s12862-017-1018-8

journal_volume

17

pub_type

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