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A very short, functionally constrained sequence diagnoses cone snails in several Conasprella clades.

Abstract：

:The traditional taxonomy of ca. 700 cone snails assigns all species to a single genus, Conus Linnaeus 1758. However, an increasing body of evidence suggests that some belong to a phylogenetically distinct clade that is sometimes referred to as Conasprella. Previous work (Kraus et al., 2011) showed that a short (259 bp) conserved intronic sequence (CIS) of the γ-glutamyl carboxylase gene (intron 9) can be used to delineate deep phylogenetic relationships among some groups of Conus. The work described here uses intron 9 (338 bp) to resolve problematic relationships among the conasprellans and to distinguish them from Conus proper. Synapomorphic mutations at just 39 sites can resolve several groups within Conasprella because the informative region of intron 9 is so well conserved that the phylogenetic signal is not obscured by homoplasies at conflicting sites. Intron 9 also unambiguously distinguishes Conasprella as a whole from Conus because the conserved regions that are so well conserved within each group are not alignable and clearly not homologous between them. This pattern suggests that expression of the γ-glutamyl carboxylase gene may have undergone a functionally significant change in Conus or Conasprella shortly after they diverged.

journal_name

Mol Phylogenet Evol

journal_title

Molecular phylogenetics and evolution

authors

Kraus NJ,Watkins M,Bandyopadhyay PK,Seger J,Olivera BM,Corneli PS

doi

10.1016/j.ympev.2012.06.014

subject

Has Abstract

pub_date

2012-10-01 00:00:00

pages

335-8

issue

1

eissn

1055-7903

issn

1095-9513

pii

S1055-7903(12)00228-X

journal_volume

65

pub_type

杂志文章

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