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F Grandjean

Publications and source records attributed to F Grandjean.

4 recordsLinked to original sources
PubMed1997

Preliminary results on the genetic variability of mitochondrial DNA in the signal crayfish, Pacifastacus leniusculus Dana.

This study presents a revised method for the extraction of mitochondrial genome (mtDNA) from crayfish species of aquacultural interest, Pacifastacus leniusculus. The mean size of the mitochondrial genome is approximately 18,000 bp. Restriction fragment length polymorphism (RFLP) analysis performed on the mtDNA has revealed extensive genetic variability within this species. The estimated percentage of nucleotide sequence divergence among the four haplotypes found for P. leniusculus ranges from 1.16 to 3.99%. These data suggest that RFLP analysis of mtDNA may provide greater resolution than protein electrophoresis for population identification among signal crayfish populations. This marker offers new avenues for aquaculture and for understanding the genetic structure and evolutionary history of crayfish populations.

Animals↗
PubMed1993

Mitochondrial DNA polymorphism and feminizing sex factors dynamics in a natural population of Armadillidium vulgare (Crustacea, Isopoda).

Sex determination in Armadillidium vulgare may be under the control of two parasitic sex factors that reverse genetic males into functional neo-females. The first feminizing factor (F) is a Wolbachia and the other (f) is probably a sequence of the F bacterial DNA unstably integrated into the host genome. Both of these feminizing factors are mainly maternally transmitted. Here we investigate the mitochondrial DNA polymorphism of wild iso-female lineages harbouring either F or f. Among the four haplotypes present in the population, two were the f-harbouring lineages, while two were common to the F- and f-harbouring lineages. This result suggests that there has been an introgression of the f factor into lineages infected by F Wolbachia. Based on previous data, we propose two different ways to account for such introgression. Given the particular dynamics of feminizing factors (f-harbouring lineages increase in populations at the expense of F-harbouring lineages), such an introgression should prevent the replacement of F-linked mitochondrial types by f-linked mitochondrial types in wild populations.

Animals↗