ArticlePloS one2018
Physical mapping of repetitive DNA suggests 2n reduction in Amazon turtles Podocnemis (Testudines: Podocnemididae).
Article in PloS one, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers.
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Who cites it
15 citing papers in PubMed.
- Chromosomal puzzle in snakes: adjacent interstitial telomeric sites on chromosome 5 in three species of genus Vipera.Protoplasma · 2026Article
- Cytogenetic Analysis of Histone Gene and DNA Methylation in Amazonian Turtles (Chelonia: Podocnemididae).ACS omega · 2025Article
- Article
- High Chromosomal Reorganization and Presence of Microchromosomes in Chactidae Scorpions from the Brazilian Amazon.Biology · 2023Article
- Small Body, Large Chromosomes: Centric Fusions Shaped the Karyotype of the Amazonian Miniature FishGenes · 2023Article
- Article
- Matamatas Chelus spp. (Testudines, Chelidae) have a remarkable evolutionary history of sex chromosomes with a long-term stable XY microchromosome system.Scientific reports · 2022Article
- Telomere organization and the interstitial telomeric sites involvement in insects and vertebrates chromosome evolution.Genetics and molecular biology · 2022Article
- Review
- Article
- The Amazonian Red Side-Necked TurtleCells · 2020Article
- Article
- Evolutionary insights in Amazonian turtles (Testudines, Podocnemididae): co-location of 5S rDNA and U2 snRNA and wide distribution of Tc1/Mariner.Biology open · 2020Article
- Article
- Heterochromatin and microsatellites detection in karyotypes of four sea turtle species: Interspecific chromosomal differences.Genetics and molecular biology · 2020Article
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Authors and funding
6 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Cytogenetic studies show that there is great karyotypic diversity in order Testudines (2n = 26-68), and that this may be mainly attributed to the presence/absence of microchromosomes. Members of the Podocnemididae family have the smallest diploid numbers of this order (2n = 26-28), which may be a derived condition of the group. Diverse studies suggest that repetitive-DNA-rich sites generally act as hotspots for double-strand breaks and chromosomal reorganization. In this context, we used fluorescent in situ hybridization (FISH) to map telomeric sequences (TTAGGG)n, 45S rDNA, and the genes encoding histones H1 and H3 in two species of genus Podocnemis. We also observed conservation of the 45S rDNA and H1 histone sequences (probable case of conserved synteny), but multiple conserved and non-conserved clusters of H3 genes, which colocalized with the interstitial telomeric sequences in the Podocnemis genome. Our results suggest that fusions have occurred between macro and microchromosomes or between microchromosomes, leading to the observed reduction in diploid number in the family Podocnemididae.
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