Is period gene causally involved in the photoperiodic regulation of reproductive diapause in the linden bug, Pyrrhocoris apterus?
Language English Country Great Britain, England Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
15993130
DOI
10.1016/j.jinsphys.2005.01.009
PII: S0022-1910(05)00026-0
Knihovny.cz E-resources
- MeSH
- DNA metabolism MeSH
- Phenotype MeSH
- Photoperiod * MeSH
- Genetic Linkage MeSH
- Heteroptera genetics physiology MeSH
- Insect Proteins biosynthesis MeSH
- Polymorphism, Single Nucleotide MeSH
- Larva genetics physiology MeSH
- RNA, Messenger metabolism MeSH
- Mutation MeSH
- Reproduction genetics physiology MeSH
- Up-Regulation MeSH
- Gene Expression Regulation, Developmental genetics MeSH
- Animals MeSH
- Check Tag
- Male MeSH
- Female MeSH
- Animals MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- DNA MeSH
- Insect Proteins MeSH
- RNA, Messenger MeSH
Earlier experiments demonstrated a strong up-regulation of per mRNA in wild-type (Wt) females of Pyrrhocoris apterus reared under diapause-inducing short days, while per mRNA levels were low in females of two non-diapause mutant strains (Nd), irrespective of photoperiod. In the present study, different sequences of per DNA in two strains of geographically different origin enabled us to analyse genetic linkage between the per gene and the Nd phenotype. Crosses between Wt females originating from C. Budejovice (Czech Republic) and Nd males originating from Lyon (France) resulted in F(2) progeny where 411 females entered diapause under short days and 120 females were reproducing. Thus, the segregation was very close to the 3:1 ratio in favour of diapause females, suggesting that the Nd trait behaves as a single autosomal recessive. Analysis of DNA in 20 females of the F(2) progeny revealed that their phenotype was not linked to the per genotype. We conclude that the per gene is not primarily responsible for the block to diapause photoresponsiveness in Nd mutants and its role, if any, is downstream from other gene(s) controlling diapause. This is the first attempt at genetic linkage analysis between a bona fide circadian clock gene and photoperiodism in a "non-drosophilid" species.
Biological Faculty University of South Bohemia Branisovska 31 Ceske Budejovice 370 05 Czech Republic
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