Sequence divergence and expression of a transformer gene in the branchiopod crustacean, Daphnia magna.

Abstract:

:Environmental decline triggers a switch in reproductive strategy of Daphnia magna from asexual to sexual reproduction; however, the molecular basis of such environmental sex determination remains largely unknown. In insects most closely related to branchiopod crustaceans, orthologs of the Drosophila transformer gene such as dipteran transformer (tra), honeybee feminizer (fem) and complementary sex determiner (csd) function as sex determining factors. Therefore, we cloned a D. magna transformer gene (dmagtra) and analyzed its expression. The predicted amino acid sequence has 380 amino acids including an arginine-serine-rich region, which is characteristic of insect orthologs of Tra. Residues 180 to 205 are highly conserved with known Tra orthologs. The domain organization of DmagTra is distinct from known Tra orthologs; moreover, dmagtra does not display any detectable sexual dimorphic differences in expression or splicing patterns. We infer from these results that dmagtra may not be responsible for sex determination in D. magna.

journal_name

Genomics

journal_title

Genomics

authors

Kato Y,Kobayashi K,Oda S,Tatarazako N,Watanabe H,Iguchi T

doi

10.1016/j.ygeno.2009.12.005

subject

Has Abstract

pub_date

2010-03-01 00:00:00

pages

160-5

issue

3

eissn

0888-7543

issn

1089-8646

pii

S0888-7543(09)00275-4

journal_volume

95

pub_type

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