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2017 ; 6
(ä): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
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English Wikipedia
Repeated losses of PRDM9-directed recombination despite the conservation of PRDM9
across vertebrates
#MMPMID28590247
Baker Z
; Schumer M
; Haba Y
; Bashkirova L
; Holland C
; Rosenthal GG
; Przeworski M
Elife
2017[Jun]; 6
(ä): ä PMID28590247
show ga
Studies of highly diverged species have revealed two mechanisms by which meiotic
recombination is directed to the genome-through PRDM9 binding or by targeting
promoter-like features-that lead to dramatically different evolutionary dynamics
of hotspots. Here, we identify PRDM9 orthologs from genome and transcriptome data
in 225 species. We find the complete PRDM9 ortholog across distantly related
vertebrates but, despite this broad conservation, infer a minimum of six partial
and three complete losses. Strikingly, taxa carrying the complete ortholog of
PRDM9 are precisely those with rapid evolution of its predicted binding affinity,
suggesting that all domains are necessary for directing recombination. Indeed, as
we show, swordtail fish carrying only a partial but conserved ortholog share
recombination properties with PRDM9 knock-outs.