snaR genes: recent descendants of Alu involved in the evolution of chorionic gonadotropins - PubMed (original) (raw)
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snaR genes: recent descendants of Alu involved in the evolution of chorionic gonadotropins
A M Parrott et al. Cold Spring Harb Symp Quant Biol. 2009.
Abstract
We identified a novel family of human noncoding RNAs by in vivo cross-linking to the nuclear factor 90 (NF90) protein. These small NF90-associated RNAs (snaRs) are transcribed by RNA polymerase III and display restricted tissue distribution, with high expression in testis and discrete areas of the brain. The most abundant human transcript, snaR-A, interacts with the cell's transcription and translation systems. snaR genes have evolved in African Great Apes (human, chimpanzee, and gorilla) and some are unique to humans. We traced their ancestry to the Alu SINE (short interspersed nucleotide element) family, via two hitherto unreported sets of short genetic elements termed ASR (Alu/snaR-related) and CAS (Catarrhine ancestor of snaR). This derivation entails a series of internal deletions followed by expansions. The evolution of these genes coincides with major primate speciation events: ASR elements are found in all monkeys and apes, whereas CAS elements are limited to Old World monkeys and apes. In contrast to ASR and CAS elements, which are retrotransposons, human snaR genes are predominantly located in three clusters on chromosome 19 and have been duplicated as part of a larger genetic element. Insertion of the element containing snaR-G into a gene encoding a chorionic gonadotropin beta subunit generated new hormone genes in African Great Apes.
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