Journal Article
Karyotypic divergence of two co-occurring species of Andean climbing catfishes (Siluriformes: Loricarioidei: Astroblepidae)
Conde-Saldan, C.C., Souza Cunha, M., Albornoz-Garzo, J.G., Valiati Barreto, C.A., Ibagon, N., Villa-Navarro, F.A. and Abdala Dergam, J.
Record Number:
4437
Year:
2019
Journal:
Zebrafish
Pages:
106-114
Volume:
16
Abstract:
The monotypic Astroblepidae fish family includes 81 species distributed along Central and Northern Andes in
South America and Panama´ in Central America; most aspects regarding its biology, taxonomy, and chromosomal
features remain largely unknown. This study reports the karyotype of two sympatric Astroblepus species
from the Colombian Andes, aiming to provide novel information on karyotype organization and reveal possible
chromosomal rearrangements occurred on these species, through mapping of different repetitive DNA
classes, including microsatellites and ribosomal DNA multigene families. The results showed differences in
the chromosome number and karyotypic formula: Astroblepus grixalvii had 2n = 52 (28m+8sm +12st +4a) with
the metacentric pair number 1 as the largest chromosome pair, whereas Astroblepus homodon had 2n = 54
(30m+8sm +8st +8a) and less evident chromosome size differences. Microsatellite probes marked the tips of all
chromosomes in both species except the short arms of acrocentric pair numbers 24 and 25 in A. homodon. Each
ribosomal probe marked different chromosome pairs in both species. Microsatellite patterns suggest that the 2n
increase probably involved a centric fission event that occurred during the evolutionary history of these species.
This is the first karyotype description of an Astroblepus species and it contributes to the theoretical framework
about the karyoevolutionary trends within Loricarioidei.
Keywords: centric fission, karyotypic evolution, Astroblepus, repetitive DNA
Times Cited:
2
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