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Proc Natl Acad Sci U S A
2005 Aug 16;10233:11769-74. doi: 10.1073/pnas.0505291102.
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An evolutionary constraint: strongly disfavored class of change in DNA sequence during divergence of cis-regulatory modules.
Cameron RA
,
Chow SH
,
Berney K
,
Chiu TY
,
Yuan QA
,
Krämer A
,
Helguero A
,
Ransick A
,
Yun M
,
Davidson EH
.
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The DNA of functional cis-regulatory modules displays extensive sequence conservation in comparisons of genomes from modestly distant species. Patches of sequence that are several hundred base pairs in length within these modules are often seen to be 80-95% identical, although the flanking sequence cannot even be aligned. However, it is unlikely that base pairs located between the transcription factor target sites of cis-regulatory modules have sequence-dependent function, and the mechanism that constrains evolutionary change within cis-regulatory modules is incompletely understood. We chose five functionally characterized cis-regulatory modules from the Strongylocentrotus purpuratus (sea urchin) genome and obtained orthologous regulatory and flanking sequences from a bacterial artificial chromosome genome library of a congener, Strongylocentrotus franciscanus. As expected, single-nucleotide substitutions and small indels occur freely at many positions within the regulatory modules of these two species, as they do outside the regulatory modules. However, large indels (>20 bp) are statistically almost absent within the regulatory modules, although they are common in flanking intergenic or intronic sequence. The result helps to explain the patterns of evolutionary sequence divergence characteristic of cis-regulatory DNA.
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