| host-defense peptides in skin secretions of the tetraploid frog silurana epitropicalis with potent activity against methicillin-resistant staphylococcus aureus (mrsa). | a putative genome duplication event within the silurana lineage has given rise to the tetraploid cameroon clawed frog silurana epitropicalis (fischberg, colombelli, and picard, 1982). peptidomic analysis of norepinephrine-stimulated skin secretions of s. epitropicalis led to identification of 10 peptides with varying degrees of growth-inhibitory activity against escherichia coli and staphylococcus aureus. structural characterization identified the peptides as belonging to the magainin family (ma ... | 2012 | 22800690 |
| chromosome divergence during evolution of the tetraploid clawed frogs, xenopus mellotropicalis and xenopus epitropicalis as revealed by zoo-fish. | whole genome duplication (wgd) generates new species and genomic redundancy. in african clawed frogs of the genus xenopus, this phenomenon has been especially important in that (i) all but one extant species are polyploid and (ii) whole genome sequences of some species provide an evidence for genomic rearrangements prior to or after wgd. within xenopus in the subgenus silurana, at least one allotetraploidization event gave rise to three extant tetraploid (2n = 4x = 40) species-xenopus mellotropi ... | 2017 | 28545147 |
| caerulein precursor fragment (cpf) peptides from the skin secretions of xenopus laevis and silurana epitropicalis are potent insulin-releasing agents. | peptidomic analysis of norepinephrine-stimulated skin secretions of the tetraploid clawed frog xenopus laevis (pipidae) led to the identification of 10 peptides with the ability to stimulate the release of insulin from the rat brin-bd11 clonal β cell line. these peptides were purified to near homogeneity and structural characterization showed that they belong to the magainin (2 peptides), peptide glycine-leucine-amide (pgla) (1 peptide), xenopsin precursor fragment (1 peptide), and caerulein pre ... | 2013 | 23142129 |
| a comparison of the karyotype, constitutive heterochromatin, and nucleolar organizer regions of the new tetraploid species xenopus epitropicalis fischberg and picard with those of xenopus tropicalis gray (anura, pipidae). | a cytological analsis of the recently discovered tetraploid species xenopus epitropicalis was carried out, using, in addition to the classical orcein method, silver staining and alkaline giemsa banding techniques. the chromosome number of x. epitropicalis was found to be 40. the chromosomes can be grouped in to sets of four similar chromosomes (quartets), resembling the karyotype of x. tropicalis (2n = 20). however, c-band patterns revealed heterogeneity within the quartets, dividing each of the ... | 1982 | 7151486 |