Comparative analysis of Xenopus tropicalis and Xenopus laevis vitellogenin gene sequences

Linkage arrangement in the vitellogenin gene family of Xenopus laevis as revealed by gene segregation analysis.

Using restriction fragment length polymorphism (RFLP) we have analyzed the segregation of alleles of the different vitellogenin genes of Xenopus laevis. The results demonstrate that the four genes whose expression is controlled by oestrogen, form two linkage groups. The genes A1, A2 and B1 are linked genetically whereas the fourth gene, the gene B2, segregates independently. The possible origin...

Comparison of induction during development between Xenopus tropicalis and Xenopus laevis.

Several in vitro systems exist for the induction of animal caps using growth factors such as activin. In this paper, we compared the competence of activin-treated animal cap cells dissected from the late blastulae of Xenopus tropicalis and Xenopus laevis. The resultant tissue explants from both species differentiated into mesodermal and endodermal tissues in a dose-dependent manner. In addition...

ترتیب اعصای جانبی در دم لارو of Xenopus laevis

Comparison of the organization and fine structure of a chicken and a Xenopus laevis vitellogenin gene.

The structural organization and the coding nucleotide sequence of the Xenopus laevis A2 and the chicken major vitellogenin genes have been compared. Both genes show the same exon-intron organization. However, the degree of homology between the nucleotide and derived amino acid sequences varies extensively along the genes. Several of the 35 exons are quite similar, and a unique cysteine motif in...

More ribosomal spacer sequences from Xenopus laevis.

The base sequence analysis of a Xenopus laevis ribosomal DNA repeat (7) has been extended to cover almost the entire non-transcribed and external transcribed spacer. A compilation of these sequences is presented. All the repetitive and non-repetitive sequence elements of the spacer are identified and their evolution discussed. Comparison of the X.laevis and S.cerevisiae (25,26) ribosomal DNAs s...