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- W4322702935 abstract "The recent findings that key developmental genes are conserved across animal phyla have led to descriptions of evolutionary change in development based on the recruitment of these few molecules. This approach, however, encounters problems in assigning homology across long evolutionary distances. By contrast, reproducibility of the cell lineage of free-living soil nematodes (order Rhabditida) and conservation of larval blast cells across nematode species permit evolutionary comparisons of developmental mechanisms among nematodes at the cellular level. Such comparative studies uncover an unexpected flexibility of developmental mechanisms: Large evolutionary differences have been described between invariant and noninvariant lineages, in the cellular mechanisms specifying a given cell (for instance, the gonadal anchor cell), in the subcellular events leading to asymmetric divisions (for instance, the first division of the egg), and in redundant networks of cell interactions (for instance, those specifying the centered pattern of vulva precursor fates). Interestingly, redundancy of developmental mechanisms favored by selective pressure allows in turn for evolution of these mechanisms. Such evolutionary changes in developmental mechanisms specifying cell fates can occur in the absence of obvious morphological change, which rather correlates with evolution of cell fates per se: death, division, migration, and differentiation (for instance, in the reduction of the posterior gonadal arm in monodelphic species or in change in vulva position). J. Exp. Zool. (Mol. Dev. Evol.) 285:3–18, 1999.© 1999 Wiley-Liss, Inc." @default.
- W4322702935 created "2023-03-02" @default.
- W4322702935 creator A5080275772 @default.
- W4322702935 date "1999-04-15" @default.
- W4322702935 modified "2023-10-16" @default.
- W4322702935 title "Evolution of developmental mechanisms in nematodes" @default.
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