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Genetica

, Volume 126, Issue 3, pp 291–301 | Cite as

Karyotype and Chromosomal Location of 18S–28S and 5S Ribosomal DNA in the Scallops Pecten maximus and Mimachlamys varia (Bivalvia: Pectinidae)

  • Ana Insua
  • María José López-Piñón
  • Ruth Freire
  • Josefina Méndez
Article

Abstract

This work describes the karyotype and chromosomal location of the ribosomal DNA (rDNA) of Pecten maximus and Mimachlamys varia, two commercial scallop species from Europe. According to the chromosome centromeric index values found, the karyotype of P. maximus is composed of 1 metacentric, 2 metacentric–submetacentric, 1 telocentric–subtelocentric and 15 telocentric pairs, and that of M. varia of 4 metacentric, 2 subtelocentric–submetacentric, 9 subtelocentric, 3 subtelocentric–telocentric and 1 telocentric–subtelocentric pairs. In P. maximus, 18S-28S rDNA was located by FISH on a metacentric–submetacentric pair, and in M. varia on a subtelocentric–submetacentric pair using both silver staining and FISH. PCR amplification of the 5S rDNA unit yielded a single product of about 460 bp (P. maximus) and 450 bp (M. varia), that used as probe revealed a 5S rDNA site on a telocentric pair in P. maximus and a subtelocentric pair in M. varia. Two-color FISH or sequential silver staining of 5S rDNA-FISH-metaphases corroborated that the two gene families are located on different chromosomes in both species. A comparative analysis of the data allowed the inference of karyotypic relationships within scallops.

Keywords

FISH karyotype Mimachlamys varia Pecten maximus ribosomal DNA scallops 

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Copyright information

© Springer 2006

Authors and Affiliations

  • Ana Insua
    • 1
  • María José López-Piñón
    • 1
  • Ruth Freire
    • 1
  • Josefina Méndez
    • 1
  1. 1.Departamento de Biología Celular y MolecularUniversidade da CoruñaA CoruñaSpain

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