2020
DOI: 10.1590/1678-4685-gmb-2020-0213
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Heterochromatin and microsatellites detection in karyotypes of four sea turtle species: Interspecific chromosomal differences

Abstract: The wide variation in size and content of eukaryotic genomes is mainly attributed to the accumulation of repetitive DNA sequences, like microsatellites, which are tandemly repeated DNA sequences. Sea turtles share a diploid number (2n) of 56, however recent molecular cytogenetic data have shown that karyotype conservatism is not a rule in the group. In this study, the heterochromatin distribution and the chromosomal location of microsatellites (CA) n , (GA) n , (CAG) n , (GATA) n , (GAA) n , (CGC) n and (GACA)… Show more

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Cited by 7 publications
(19 citation statements)
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References 70 publications
(145 reference statements)
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“…Thus, the association of this heteromorphic region as polymorphic or associated with sex should be further investigated in B. albopunctata . However, this pattern of microsatellite organization in the euchromatin was also observed in the karyotypes of other vertebrates, non-related to the sex, as in Cheloniidae ( Machado et al, 2020 ) and Cycloramphidae species ( Bueno et al, 2021 ). Still, the absence of available genomic information does not allow us to understand the structure and functions of these regions.…”
Section: Discussionsupporting
confidence: 52%
See 1 more Smart Citation
“…Thus, the association of this heteromorphic region as polymorphic or associated with sex should be further investigated in B. albopunctata . However, this pattern of microsatellite organization in the euchromatin was also observed in the karyotypes of other vertebrates, non-related to the sex, as in Cheloniidae ( Machado et al, 2020 ) and Cycloramphidae species ( Bueno et al, 2021 ). Still, the absence of available genomic information does not allow us to understand the structure and functions of these regions.…”
Section: Discussionsupporting
confidence: 52%
“…In situ location of repetitive DNAs is considered an excellent chromosomal marker for genomic comparison ( Machado et al, 2020 ; Azambuja et al, 2022 ; Deon et al, 2022 ). Eukaryotic genomes contain a large portion of repetitive DNA sequences ( Sumner, 2003 ).…”
Section: Introductionmentioning
confidence: 99%
“…Despite this substantial homology, some pericentromeric regions of macrochromosomes can also show interspecific chromosomal differences. For example, a comparative analysis of satellite sequences among the four sea turtle species including Chelonia mydas , Caretta caretta , Eretmochelys imbricata, and Lepidochelys olivacea showed species-specific variation of microsatellites in heterochromatin regions [ 65 ]. Chelids have a high diploid number and many microchromosomes (2 n = 50–64) and are similar in this respect to cryptodires (2 n = 50–66).…”
Section: Microchromosome Distribution In Vertebrate Lineagementioning
confidence: 99%
“…The unique exception observed was in the karyotype of Elseya novaeguineae ( Mazzoleni et al, 2020 ), in which an interesting heteromorphism male-specific was observed with (TTAGGG) n probe, revealing richness of the telomeric-like motifs in the interstitial position of the chromosome Y. In sea turtles, the ITS were also observed on the microchromosomes ( Machado et al, 2020a , 2020b ). Despite the prevalence of centromeric ITS in turtle chromosomes, when the karyotypes were analyzed in the phylogenetic context, any occurrence of ITS could be assigned as interchromosomal rearrangements ( Clemente et al , 2020 ).…”
Section: Its and Chromosomal Remodeling In Insects And Vertebratesmentioning
confidence: 99%