Karyotype and nuclear DNA content of Trichomycterus areolatus (Siluriformes, Trichomycteridae)
Genet. mol. biol
;
29(2): 278-282, 2006. ilus, tab
Article
in English
| LILACS
| ID: lil-432698
ABSTRACT
Cytogenetic analysis of Trichomycterus areolatus, collected from the Tijeral and Huilma Rivers in southern Chile has shown a diploid chromosome number of 2n = 54, a fundamental number of FN = 106, and a karyotypic formula of 44m + 8sm + 2st. Intra-individual polymorphism of chromosome number (2n = 54, 55 and 56) in specimens from the Huilma River has also been documented, providing further evidence of the occurrence of this phenomenon in Trichomycterus. The karyotype exhibited large chromosome pairs: metacentric pairs 1 (relative length 7.54 percent), 2 (5.75 percent) and 3 (5.09 percent), submetacentric pair 23 (5.25 percent), and subtelocentic pair 27 (5.28 percent). Nuclear DNA content analysis showed an average value of 5.04 ± 1.09 pg/nucleus. This DNA content is higher than the mean value described for other species in this genus.
Full text:
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Index:
LILACS (Americas)
Main subject:
DNA
/
Fishes
Limits:
Animals
Language:
English
Journal:
Genet. mol. biol
Journal subject:
Genetics
Year:
2006
Type:
Article
Affiliation country:
Chile
Institution/Affiliation country:
Universidad de Los Lagos/CL
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