Expression of hindlimb abnormalities under rearing temperature effects during the larval development of the salamander Pleurodeles waltl (urodele amphibian).

Anomalie m.p. is a spontaneous and heritable hindlimb abnormality described earlier.

Hereditary abnormal activation in Pleurodeles waltl oocytes.

A mutation which affects the eggs was detected in a Pleurodeles waltl laboratory strain. About 4 to 5 hours after fertilization, i.e.

Genetic evidence for linkage with the Z and W sex chromosomes of two distinct couples of alleles controlling larval and postmetamorphic skin pigmentation in salamander.

In Pleurodeles waltl, progeny resulting from a cross between 2 individuals of the Z/W sexual genotype include 25% of W/W individuals, while those issued from crossing a Z/W neomale with a W/W thelygenous female include 50% of W/W individuals. W/W individuals can be identified through the peptidase-1 zymogram since, in P. waltl, this enzyme is controlled by codominant alleles which are linked to the sex chromosomes.

Sex-linked peptidase-1 patterns in Pleurodeles waltlii Michah (Urodele Amphibian): genetic evidence for a new codominant allele on the W sex chromosome and identification of ZZ, ZW and WW sexual genotypes.

In Pleurodeles waltlii, peptidase-1 is a dimeric enzyme which has been shown to be controlled by two codominant alleles, Pep-1A and Pep-1B (Ferrier et al., 1980, 1983), linked respectively to the Z and W sex chromosomes. The enzymatic patterns obtained after starch gel electrophoresis were used routinely to identify the sexual genotypes of animals reared in our laboratory.

[Ultrastructural localization of 3-beta-hydroxysteroid dehydrogenase activity in the glandular tissue cells of the testis of Pleurodeles waltlii Michach. (Amphibia, Urodela)].

With the potassium ferricyanide method, the localization of the sites of 3 beta-hydroxysteroid dehydrogenase activity has been investigated in the glandular tissue cells, previously fixed, of the Pleurodeles testis. An abundant copper ferrocyanide precipitate, the final reaction product, is observed in the vicinity of the external faces of the membranes of the smooth endoplasmic reticulum, or in contact with them. A very weak reaction occurs in mitochondrial cristae.