Cytogenetic study in the Brazilian semiarid lizard Tropidurus hispidus (Squamata, Tropiduridae)

Autores/as

  • Marcelo João da Silva
  • Ana Paula de Araújo Vieira
  • Flávia Manoela Galvão Cipriano
  • Maria Rita dos Santos Cândido
  • Tamaris Gimenez Pinheiro
  • Edivaldo Herculano Correa Oliveira
  • Edson Lourenço da Silva

Palabras clave:

Reptile chromosomes, Microsatellite, 18S rDNA, Telomeric repeats

Resumen

Different classes of repetitive DNA sequences are found in eukaryotes, often composing substantial portions of the genome, associated with their important role in the structural and functional genome organization. In this work, we mapped repetitive DNA sequences (18S rDNA, microsatellites and telomeric motifs) in the karyotype of Tropidurus hispidus, a species of lizard
from the Brazilian semiarid region. We found a diploid number of 2n = 36 (6 pairs of biarmed macrochromosomes and 12 pairs of microchromosomes). The 18S rDNA clusters were localized at the subterminal region of the long arm of pair 2. The telomeric probes produced signals at terminal, interstitial and centromeric positions of some chromosome pairs, which might indicate
the occurrence of chromosomal rearrangements via chromosome fusions. Microsatellite sequences were found in at least two distinct patterns - clustered in the telomeric/pericentromeric regions or observed as scattered signals in the chromosomes. This study represents an initial step to explore the evolutionary dynamics of repetitive sequences in the Tropidurus genus and
considering the scarcity of data concerning the chromosomal mapping of repetitive sequences in Tropiduridae species, it reinforces the importance of integrating other methodologies, including the isolation and physical mapping of different repetitive DNA sequences, contributing to understanding the patterns of karyotypic evolution in lizards.

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Publicado

24-04-2023

Cómo citar

da Silva, M. J., de Araújo Vieira, A. P., Galvão Cipriano, F. M., dos Santos Cândido, M. R., Gimenez Pinheiro, T., Correa Oliveira, E. H., & da Silva, E. L. (2023). Cytogenetic study in the Brazilian semiarid lizard Tropidurus hispidus (Squamata, Tropiduridae). Cuadernos De Herpetología, 37(1). Recuperado a partir de https://cuadernosdeherpetologia.com/index.php/CdH/article/view/79