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Pristionchus pacificus vulva formation: polarized division, cell migration, cell fusion, and evolution of invagination.

Abstract：

:Tube formation is a widespread process during organogenesis. Specific cellular behaviors participate in the invagination of epithelial monolayers that form tubes. However, little is known about the evolutionary mechanisms of cell assembly into tubes during development. In Caenorhabditis elegans, the detailed step-to-step process of vulva formation has been studied in wild type and in several mutants. Here we show that cellular processes during vulva development, which involve toroidal cell formation and stacking of rings, are conserved between C. elegans and Pristionchus pacificus, two species of nematodes that diverged approximately 100 million years ago. These cellular behaviors are divided into phases of cell proliferation, short-range migration, and cell fusion that are temporally distinct in C. elegans but not in P. pacificus. Thus, we identify heterochronic changes in the cellular events of vulva development between these two species. We find that alterations in the division axes of two equivalent vulval cells from Left-Right cleavage in C. elegans to Anterior-Posterior division in P. pacificus can cause the formation of an additional eighth ring. Thus, orthogonal changes in cell division axes with alterations in the number and sequence of cell fusion events result in dramatic differences in vulval shape and in the number of rings in the species studied. Our characterization of vulva formation in P. pacificus compared to C. elegans provides an evolutionary-developmental foundation for molecular genetic analyses of organogenesis in different species within the phylum Nematoda.

journal_name

Dev Biol

journal_title

Developmental biology

authors

Kolotuev I,Podbilewicz B

doi

10.1016/j.ydbio.2003.10.029

subject

Has Abstract

pub_date

2004-02-15 00:00:00

pages

322-33

issue

2

eissn

0012-1606

issn

1095-564X

pii

S0012160603006663

journal_volume

266

pub_type

杂志文章

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