Abstract:
BACKGROUND:During eukaryotic genome evolution, tandem gene duplication is the most frequent event giving rise to clustered gene families. However, how expression divergence between tandemly duplicated genes has emerged and maintained remain unclear. In particular, it is unknown if epigenetic regulators have been involved in the process. RESULTS:We demonstrate that CCCTC-binding factor (CTCF), the master epigenetic regulator and the only known insulator protein in humans, has played a predominant role in generating divergence in both expression profiles and expression levels between adjacent paralogs in the human genome. This phenomenon was not observed for non-paralogous adjacent genes. After tandem duplication events, CTCF-binding sites gradually accumulate between paralogs. This trend was more prominent for genes involved in particular functions. CONCLUSIONS:The accumulation of CTCF-binding sites drives expression divergence of tandemly duplicated genes. This process is likely targeted by natural selection. Our study reveals the importance of CTCF to the evolution of animal diversity and complexity.
journal_name
BMC Genomicsjournal_title
BMC genomicsauthors
Liao BY,Chang Adoi
10.1186/1471-2164-15-S1-S8subject
Has Abstractpub_date
2014-01-01 00:00:00pages
S8issn
1471-2164pii
1471-2164-15-S1-S8journal_volume
15 Suppl 1pub_type
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