Natural selection and geographical variation in a known sex-linked gene of the Common Lizard in Europe. Implications for chromosomal evolution

Abstract

The gene coding for mannose phosphate isomerase (MPI) has been found to be sex-linked in Common Lizard (Lacerta vivipara) samples from Russia to France. Both sex chromosomes can express one or two codominant alleles. The results are in agreement with the Z1Z2W heteromorphic karyotype described in L. vivipara populations from central France. Allozyme frequencies can strongly vary between regions; in the Austrian population sampled, an allele that is rare or absent elsewhere has been fixed on chromosome W. The possibility is raised that habitat selection involving MPI allozymes will be demonstrated with suitable sampling, while the existence of endocyclic selection has been substantiated. The data suggest that the ZIZ2W sex determination system is older than implied by the literature and possibly fixed in the whole species, but it is concluded that another sex-linked gene than MPI has been instrumental in fixing the translocation involved.

A sex-linked locus (Mpi) in the opossum shrimp Mysis relicta: implications for early postglacial colonization history

“…Recombination between the marker genes and sex factor is common in such instances, allele frequencies in the sexes being similar. Yet, cases in which marker alleles are differentially associated with sex, suggesting recombination suppression, are also known: from amphibians (Ferrier et al, 1983), reptiles (Salvido et al, 1990), insects (Berlocher, 1984;Santos & Luykx, 1985) and two crustaceans (Shaklee, 1983;Siegismund & Christensen, 1992). In all these instances, the heterochromosome (Y or W) is fixed for one of the marker alleles -as in Mysis.…”

A sex-linked locus (Mpi) in the opossum shrimp Mysis relicta: implications for early postglacial colonization history

“…Yet, cases in which marker alleles are differentially associated with sex, suggesting recombination suppression, are also known: from amphibians (Ferrier et al, 1983), reptiles (Salvido et al, 1990), insects (Berlocher, 1984;Santos & Luykx, 1985) and two crustaceans (Shaklee, 1983;Siegismund & Christensen, 1992). In all these instances, the heterochromosome (Y or W) is fixed for one of the marker alleles -as in Mysis.…”

“…In all these instances, the heterochromosome (Y or W) is fixed for one of the marker alleles -as in Mysis. Notably, both in the Hawaiian spiny lobster Panulirus marginatus (XY; Shaklee, 1983) and in the common lizard Lacerta vivipara (Z 1 Z 2 W; Salvido et al, 1990), the sex-associated locus is Mpi. Mpi is also sex-linked, but X-limited, in several ostracod crustaceans (Havel et al, 1990).…”