Loss of collagen gene expression in the notochord of the tailless tunicate Molgula occulta.

Loss of collagen gene expression in the notochord of the tailless tunicate Molgula occulta.
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无尾被囊动物 Molgula oculta 脊索中胶原蛋白基因表达缺失。

DOI:
10.1093/icb/icad071
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发表时间:
2023
影响因子:
2.6
通讯作者:
Stolfi,Alberto
Stolfi,Alberto
中科院分区:
生物学2区
文献类型:
--
作者:
Popsuj,Sydney;DiGregorio,Anna;Swalla,BillieJ;Stolfi,Alberto

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In tunicates, several species in the Molgulidae family have convergently lost the tailed, swimming larval body plan, including the morphogenesis of the notochord, a major chordate-defining trait. Through the comparison of taillessM. occultaand a close relative, the tailed speciesM. oculata, we show that notochord-specific expression of theCollagen Type I/II Alpha (Col1/2a)gene appears to have been lost specifically in the tailless species. Using CRISPR/Cas9-mediated mutagenesis in the tailed laboratory model tunicateCiona robusta, we demonstrate thatCol1/2aplays a crucial role in the convergent extension of notochord cells during tail elongation. Our results suggest that the expression ofCol1/2ain the notochord, although necessary for its morphogenesis in tailed species, is dispensable for tailless species. This loss is likely a result of the accumulation ofcis-regulatory mutations in the absence of purifying selective pressure. More importantly, the gene itself is not lost, likely due to its roles in other developmental processes, including during the adult stage. Our study further confirms the Molgulidae as an interesting family in which to study the evolutionary loss of tissue-specific expression of indispensable genes.
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