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Heterochromatic marker regions (nucleolar organisers) in the chromosomes of the common mussel Mytilus edulis (Mollusca: Pelecypoda)
Dixon, D.R.; McFadzen, I.R.B.; Sisley, K. (1986). Heterochromatic marker regions (nucleolar organisers) in the chromosomes of the common mussel Mytilus edulis (Mollusca: Pelecypoda). J. Exp. Mar. Biol. Ecol. 97: 205-212
In: Journal of Experimental Marine Biology and Ecology. Elsevier: New York. ISSN 0022-0981, more
Peer reviewed article  

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Keywords
    Chromosomes; Genes; Heterochromatin; Nucleolus; Mytilus edulis Linnaeus, 1758 [WoRMS]; Marine

Authors  Top 
  • Dixon, D.R.
  • McFadzen, I.R.B.
  • Sisley, K.

Abstract
    The chromosomes of Mytilus edulis were studied using chromosome banding (G- and C-banding) and silver (Ag-) staining techniques. Four pairs of chromosomes, out of the total complement of 14 pairs, were characterized by the presence of conspicuous, G-band negative/C-band positive, heterochromatic regions terminal to their long arms. The affected chromosomes were identified as pairs 1, 8, 11, and 14. Ag-staining revealed that these heterochromatic regions were also the sites of the nucleolar organiser regions (NORs): the specific gene sequences responsible for coding for ribosomal RNA, and which function as the morphological sites around which nucleoli develop at the end of mitosis.

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