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Chromosomes of Lepidochitona caprearum (Scacchi, 1836) (Polyplacophora, Acanthochitonina, Tonicellidae) provide insights into Acanthochitonina karyological evolution
- Source :
- Comparative Cytogenetics 6(4): 397-407, Comparative Cytogenetics, Vol 6, Iss 4, Pp 397-407 (2012), Comparative Cytogenetics
- Publication Year :
- 2012
- Publisher :
- Pensoft Publishers, 2012.
-
Abstract
- We describe the karyotype, location of nucleolus-organizing regions (NORs) and heterochromatin composition and distribution in Lepidochitona caprearum (Scacchi, 1836). The examined specimens had 2n=24 chromosomes; the elements of pairs 1 – 4 were metacentric, subtelocentric those of the fifth pair, telocentric the elements of other pairs. NOR-FISH, AG-NOR- and CMA3 banding showed NORs localized on pericentromeric regions of a medium small sized, telocentric chromosome pair. After C-banding or digestions with restriction enzyme NOR associate heterochromatin only was cytologically evident, resulting CMA3 positive. The comparison with other chitons chromosome data, other than to evidence a karyotypic similarity of L. caprearum to species of suborder Acanthochitonina, allows also to infer that chromosome evolution in the suborder mainly occurred via reduction of the number of the chromosomes by centric fusions, which took place repeatedly and independently in the different lineages of Acanthochitonina.
- Subjects :
- Genetics
lcsh:QH426-470
biology
Heterochromatin
heterochromatin
Chromosome
chromosome evolution
Karyotype
chiton
Plant Science
chitons
Lepidochitona caprearum
chromosome banding
biology.organism_classification
Article
lcsh:Genetics
Restriction enzyme
Polyplacophora
Acanthochitonina
Tonicellidae
Animal Science and Zoology
Biotechnology
Subjects
Details
- Language :
- English
- ISSN :
- 1993078X and 19930771
- Database :
- OpenAIRE
- Journal :
- Comparative Cytogenetics
- Accession number :
- edsair.doi.dedup.....889024dba3f09e657df89414e7c8eab9