| peptidomic analysis of the extensive array of host-defense peptides in skin secretions of the dodecaploid frog xenopus ruwenzoriensis (pipidae). | the uganda clawed frog xenopus ruwenzoriensis with a karyotype of 2n=108 is one of the very few vertebrates with dodecaploid status. peptidomic analysis of norepinephrine-stimulated skin secretions from this species led to the isolation and structural characterization of 23 host-defense peptides belonging to the following families: magainin (3 peptides), peptide glycine-leucine-amide (pgla; 6 peptides), xenopsin precursor fragment (xpf; 3 peptides), caerulein precursor fragment (cpf; 8 peptides) ... | 2016 | 27290612 |
| the fate of duplicated immunity genes in the dodecaploid xenopus ruwenzoriensis. | the relatively recent dodecaploid xenopus (x.) ruwenzoriensis (108 chromosomes) permits to catch the phenomenon of gene silencing or modification in the act. this is interesting for genes related to the immune system, many of which can be selected as a consequence of their utility or eliminated as a consequence of their cost. among receptor genes, a trend toward diploidization is seen: neither t cell receptor, immunoglobulin, or major histocompatibility complex class i and ii and linked loci are ... | 2009 | 19273062 |
| the fate of duplicated major histocompatibility complex class ia genes in a dodecaploid amphibian, xenopus ruwenzoriensis. | the dodecaploid anuran amphibian xenopus ruwenzoriensis represents the only polyploid species of xenopus in which the full silencing of the extra copies of the major histocompatibility complex (mhc) has not occurred. xenopus ruwenzoriensis is a recent polyploid that has evolved within one of the two tetraploid groups of xenopus through allopolyploidization. family studies of its mhc haplotype suggested a polysomic inheritance of the mhc class i and ii genes. four class ia bands can be detected p ... | 2002 | 12207355 |
| the fate of duplicated major histocompatibility complex class ia genes in a dodecaploid amphibian, xenopus ruwenzoriensis. | the dodecaploid anuran amphibian xenopus ruwenzoriensis represents the only polyploid species of xenopus in which the full silencing of the extra copies of the major histocompatibility complex (mhc) has not occurred. xenopus ruwenzoriensis is a recent polyploid that has evolved within one of the two tetraploid groups of xenopus through allopolyploidization. family studies of its mhc haplotype suggested a polysomic inheritance of the mhc class i and ii genes. four class ia bands can be detected p ... | 2002 | 12115642 |
| the expression of antibody diversity in natural and laboratory-made polyploid individuals of the clawed toad xenopus. | antibody diversity, as measured by isoelectric focusing of dinitrophenol-specific antibodies, was compared in different polyploid species of the clawed toad xenopus. antibody heterogeneity increased with chromosome number and dna content from xenopus tropicalis (2n = 20 chromosome) to xenopus ruwenzoriensis (2n = 108 chromosomes). laboratory allopolyploids made by hybridization between two species showing different antibody diversities and different chromosome numbers gave antibody patterns inte ... | 1982 | 6802750 |
| the karyotype of the hexaploid species xenopus ruwenzoriensis fischberg and kobel (anura: pipidae). | the chromosome number of the hexaploid species xenopus ruwenzoriensis is 108. the chromosomes fall into sets of six usually similar chromosomes (hextets) which can be classified into the morphological groups characteristic for the genus xenopus. however, the three distinct secondary constrictions, typical for x. ruwenzoriensis, appear on two homologs only within a particular hextet, unmasking an underlying heterogeneity. the secondary constrictions on chromosome pair 11 show chromosomal associat ... | 1980 | 7389418 |