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Nat Genet
2022 Jan 01;541:62-72. doi: 10.1038/s41588-021-00970-4.
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Discovery of a genetic module essential for assigning left-right asymmetry in humans and ancestral vertebrates.
Szenker-Ravi E
,
Ott T
,
Khatoo M
,
Moreau de Bellaing A
,
Goh WX
,
Chong YL
,
Beckers A
,
Kannesan D
,
Louvel G
,
Anujan P
,
Ravi V
,
Bonnard C
,
Moutton S
,
Schoen P
,
Fradin M
,
Colin E
,
Megarbane A
,
Daou L
,
Chehab G
,
Di Filippo S
,
Rooryck C
,
Deleuze JF
,
Boland A
,
Arribard N
,
Eker R
,
Tohari S
,
Ng AY
,
Rio M
,
Lim CT
,
Eisenhaber B
,
Eisenhaber F
,
Venkatesh B
,
Amiel J
,
Crollius HR
,
Gordon CT
,
Gossler A
,
Roy S
,
Attie-Bitach T
,
Blum M
,
Bouvagnet P
,
Reversade B
.
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The vertebrate left-right axis is specified during embryogenesis by a transient organ: the left-rightorganizer (LRO). Species including fish, amphibians, rodents and humans deploy motile cilia in the LRO to break bilateral symmetry, while reptiles, birds, even-toed mammals and cetaceans are believed to have LROs without motile cilia. We searched for genes whose loss during vertebrate evolution follows this pattern and identified five genes encoding extracellular proteins, including a putative protease with hitherto unknown functions that we named ciliated left-rightorganizer metallopeptide (CIROP). Here, we show that CIROP is specifically expressed in ciliated LROs. In zebrafish and Xenopus, CIROP is required solely on the left side, downstream of the leftward flow, but upstream of DAND5, the first asymmetrically expressed gene. We further ascertained 21 human patients with loss-of-function CIROP mutations presenting with recessive situs anomalies. Our findings posit the existence of an ancestral genetic module that has twice disappeared during vertebrate evolution but remains essential for distinguishing left from right in humans.
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