ANRIL/CDKN2B-AS Shows Two-stage Clade-specific Evolution and Becomes Conserved After Transposon Insertions in Simians

Overview

Journal BMC Evol Biol

Publisher Biomed Central

Specialty Biology

Date 2013 Nov 15

PMID 24225082

Citations 22

Authors

Sha He

Weiling Gu

Yize Li

Hao Zhu

Affiliations

Soon will be listed here.

Abstract

Background: Many long non-coding RNA (lncRNA) genes identified in mammals have multiple exons and functional domains, allowing them to bind to polycomb proteins, DNA methyltransferases, and specific DNA sequences to regulate genome methylation. Little is known about the origin and evolution of lncRNAs. ANRIL/CDKN2B-AS consists of 19 exons on human chromosome 9p21 and regulates the expression of three cyclin-dependent kinase inhibitors (CDKN2A/ARF/CDKN2B).

Results: ANRIL/CDKN2B-AS originated in placental mammals, obtained additional exons during mammalian evolution but gradually lost them during rodent evolution, and reached 19 exons only in simians. ANRIL lacks splicing signals in mammals. In simians, multiple transposons were inserted and transformed into exons of the ANRIL gene, after which ANRIL became highly conserved. A further survey reveals that multiple transposons exist in many lncRNAs.

Conclusions: ANRIL shows a two-stage, clade-specific evolutionary process and is fully developed only in simians. The domestication of multiple transposons indicates an impressive pattern of "evolutionary tinkering" and is likely to be important for ANRIL's structure and function. The evolution of lncRNAs and that of transposons may be highly co-opted in primates. Many lncRNAs may be functional only in simians.

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