Signatures of adaptive evolution within human non-coding sequence.

Abstract:

:The human genome is often portrayed as consisting of three sequence types, each distinguished by their mode of evolution. Purifying selection is estimated to act on 2.5-5.0% of the genome, whereas virtually all remaining sequence is considered to have evolved neutrally and to be devoid of functionality. The third mode of evolution, positive selection of advantageous changes, is considered rare. Such instances have been inferred only for a handful of sites, and these lie almost exclusively within protein-coding genes. Nevertheless, the majority of positively selected sequence is expected to lie within the wealth of functional 'dark matter' present outside of the coding sequence. Here, we review the evolutionary evidence for the majority of human-conserved DNA lying outside of the protein-coding sequence. We argue that within this non-coding fraction lies at least 1 Mb of functional sequence that has accumulated many beneficial nucleotide replacements. Illuminating the functions of this adaptive dark matter will lead to a better understanding of the sequence changes that have shaped the innovative biology of our species.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Ponting CP,Lunter G

doi

10.1093/hmg/ddl182

subject

Has Abstract

pub_date

2006-10-15 00:00:00

pages

R170-5

eissn

0964-6906

issn

1460-2083

pii

15/suppl_2/R170

journal_volume

15 Spec No 2

pub_type

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