Mormyrops boulengeri
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA530782 | ENA |
REPOSITORIES: ENA
Similar Datasets
Project description:Scutiger boulengeri Transcriptome or Gene expression
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Project description:Quasipaa boulengeri Transcriptome or Gene expression
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Project description:Scutiger boulengeri Transcriptome or Gene expression
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Project description:Quasipaa boulengeri Transcriptome or Gene expression
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Project description:Quasipaa boulengeri microdissected chromosome 1 Raw sequence reads
| PRJNA493207 | ENA
Project description:Chromosomal rearrangements have long fascinated evolutionary biologists for being widely implicated in causing genetic differentiation. Suppressed recombination has been demonstrated in various species with inversion; however, there is controversy over whether such recombination suppression would facilitate divergence in reciprocal translocation with reduced fitness. In this study, we used the spiny frog, Quasipaa boulengeri, whose western Sichuan Basin populations exhibit translocation polymorphisms, to test whether the genetic markers on translocated (rearranged) or normal chromosomes have driven this genetic differentiation. We also investigated its overall genetic structure and the possibility of chromosomal fixation. Whole-chromosome painting and genetic structure clustering suggested a single origin of the translocation polymorphisms, and high-throughput sequencing of rearranged chromosomes isolated many markers with known localizations on chromosomes. Using these markers, distinct patterns of gene flow were found between rearranged and normal chromosomes. Genetic differentiation was only found in the translocated chromosomes, not in normal chromosomes or the mitochondrial genome. Hybrid unfitness cannot explain the genetic differentiation, as then the differentiation would be observed throughout the whole genome. Our results suggest that suppressed recombination drives genetic differentiation into a balanced chromosomal polymorphism. Mapping to a reference genome, we found that the region of genetic differentiation covered a wide range of translocated chromosomes, not only in the vicinity of chromosomal breakpoints. Our results imply that the suppressed recombination region could be extended by accumulation of repetitive sequences or capture of alleles that are adapted to the local environment, following the spread and/or fixation of chromosomal rearrangement.
| S-EPMC6985567 | biostudies-literature
Project description:The Boulenger's Slug-eating snake Pareas boulengeri is a species of snake in the family Pareidae. The complete mitochondrial genome sequence (mitogenome) of this species was determined by shotgun sequencing. The total length of mitogenome is 16,778 bp and contains 13 protein-coding genes, 22 tRNA genes, two ribosome RNA genes, and two control regions (CR). Its base composition was 31.6% for A, 24.6% for T, 14.5% for G and 29.3% for C. All the protein-coding genes in P. boulengeri were distributed on the H-strand, except for the ND6 subunit gene and eight tRNA genes which were encoded on the L-strand. The phylogenetic tree of P. boulengeri and 13 other related species was reconstructed using the maximum-likelihood (ML) method. The DNA data presented here will be useful to study the evolutionary relationships of P. boulengeri.
| S-EPMC7782912 | biostudies-literature
Project description:Very few natural polymorphisms involving interchromosomal reciprocal translocations are known in amphibians even in vertebrates. In this study, thirty three populations, including 471 individuals of the spiny frog Quasipaa boulengeri, were karyotypically examined using Giemsa stain or FISH. Five different karyomorphs were observed. The observed heteromorphism was autosomal but not sex-related, as the same heteromorphic chromosomes were found both in males and females. Our results indicated that the variant karyotypes resulted from a mutual interchange occurring between chromosomes 1 and 6. The occurrence of a nearly whole-arm translocation between chromosome no. 1 and no. 6 gave rise to a high frequency of alternate segregation and probably resulted in the maintenance of the translocation polymorphisms in a few populations. The translocation polymorphism is explained by different frequencies of segregation modes of the translocation heterozygote during meiosis. Theoretically, nine karyomorphs should be investigated, however, four expected karyotypes were not found. The absent karyomorphs may result from recessive lethal mutations, position effects, duplications and deficiencies. The phylogenetic inference proved that all populations of Q. boulengeri grouped into a monophyletic clade. The mutual translocation likely evolved just once in this species and the dispersal of the one karyomorph (type IV) can explain the chromosomal variations among populations.
| S-EPMC3463521 | biostudies-literature