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.
Grandjean
F
F
Université de Poitiers, Laboratoire de Biologie Animale, URA CNRS n. 1452, France.
Rigaud
T
T
Raimond
R
R
Juchault
P
P
Souty-Grosset
C
C
D000818:Animals; D003445:Crustacea / Q000235:genetics* / Q000382:microbiology; D004272:DNA, Mitochondrial / Q000235:genetics*; D005111:Extrachromosomal Inheritance; D005260:Female; D006239:Haplotypes; D057850:Hermaphroditic Organisms; D008297:Male; D008957:Models, Genetic; D011110:Polymorphism, Genetic; D012287:Rickettsiaceae / Q000302:isolation & purification / Q000502:physiology*; D012732:Sex Determination Analysis; D019849:Sex Determination Processes; D012744:Sex Ratio; D013559:Symbiosis
D004272:DNA, Mitochondrial