The karyology of the Antarctic whelk, Neobuccinum eatoni (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...

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Bibliographic Details
Published in:Italian Journal of Zoology
Main Authors: ODIERNA G, APREA G, CAPRIGLIONE T, BARUCCA, MARCO, CANAPA, Adriana, OLMO, ETTORE
Other Authors: Odierna, G, Aprea, G, Barucca, Marco, Canapa, Adriana, Capriglione, T, Olmo, Ettore
Format: Article in Journal/Newspaper
Language:English
Published: 2006
Subjects:
Antarctic
The Antarctic
Long Arm
Antarc*
Online Access:http://hdl.handle.net/11566/53271
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.

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