The karyology of the Antarctic whelk, Neobuccinum eationi (Mollusca, Neogastropoda)

Karyotype, location of the nucleolar organizer regions (NORs) and heterochromatin presence and composition were studied in the Antarctic whelk Neobuccinum eatoni. The karyotype exhibits 2n=68 chromosomes with 10 pairs of metacentrics, 14 pairs of meta-submetacentrics, six pairs of submeta-subtelocen...

Full description

Bibliographic Details
Published in:Italian Journal of Zoology
Main Authors: ODIERNA, GAETANO, CAPRIGLIONE, TERESA, G. Aprea, M. Barucca, A. Canapa, E. Olmo
Other Authors: Odierna, Gaetano, G., Aprea, M., Barucca, A., Canapa, Capriglione, Teresa, E., Olmo
Format: Article in Journal/Newspaper
Language:English
Published: 2006
Subjects:
chromosome
chromosome banding
Neobuccinum eatoni
Gastropoda
Antarctica
Antarctic
The Antarctic
Long Arm
Antarc*
Online Access:http://hdl.handle.net/11588/464722
https://doi.org/10.1080/11250000600918076
Description
Summary:Karyotype, location of the nucleolar organizer regions (NORs) and heterochromatin presence and composition were studied in the Antarctic whelk Neobuccinum eatoni. The karyotype exhibits 2n=68 chromosomes with 10 pairs of metacentrics, 14 pairs of meta-submetacentrics, six pairs of submeta-subtelocentrics, and one pair of subtelo-telocentrics. Silver and CMA(3)/ methyl green staining and rDNA FISH evidenced telomeric NORs on the long arm of a pair of medium-sized submetacentrics. Staining with AT-specific fluorochromes evidenced telomeric bands on nearly all chromosomes and interstitial Q bands on two pairs of presumably subtelocentric chromosomes. The karyological evolution of N. eatoni seems to be characterized by a generalized neogastropod karyotype associated with a genome size increase following the accumulation of heterochromatin containing AT-rich repetitive DNA; according to some authors the latter could be related to the modulation of morphological and functional parameters of ecological significance.

Similar Items