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. 1990 Jun;87(11):4406–4410. doi: 10.1073/pnas.87.11.4406

Selector genes and the Cambrian radiation of Bilateria.

D K Jacobs 1
PMCID: PMC54119  PMID: 11607084

Abstract

There is a significantly greater post-Cambrian decline in frequency of ordinal origination among serially constructed Bilateria, such as arthropods, than in nonserially constructed Bilateria. Greater decline in arthropod ordinal origination is not predicted by ecologic, diversity-dependent models of decline in the production of higher taxa. Reduction in ordinal origination indicates increased constraint on arthropod body-plan evolution. The dispersal of selector genes in the genomes of arthropods in conjunction with the retention of a simple regulatory hierarchy in development may have caused the increased constraint seen. Increased constraint would not be expected in those organisms that are not serially constructed and presumably have not retained the simple ancestral regulatory hierarchy in development of selector gene differentiation of serial elements. The hypothesis of differential constraint tested against the fossil record in this paper can be further tested by examination of the distribution of selector genes in the genomes of arthropods.

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Selected References

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