title: Origin and evolution of Mytilus mussel satellite DNAs.
abstract: A phylogenetic reconstruction based on the amplification of 3 satellite DNAs (stDNAs) was carried out in 1 crustacean species and 15 bivalve species of the subclass Pteriomorphia (10, subfamily Mytilinae; 1, subfamily Litophaginae; 1, subfamily Modiolinae, all belonging to family Mytilidae; 1, family Arcidae; and 2, family Pectinidae). The sequences obtained showed motifs with high similarity to those of A and B boxes of tRNA promoter regions. Dot-blot hybridizations revealed that the 3 stDNAs are present mainly in high copy numbers for each species of the genus Mytilus, whereas for the other species they appear in low copy numbers. Maximum-parsimony trees evidenced a tendency to group Mytilus clones together, and species containing these sequences as a single copy were distributed among the different mytilids. Finally, the possible origin and evolution of these stDNAs is discussed.
authors.affiliation: Departamento de Biología Celular y Molecular, Facultad de Ciencias, Universidade da Coruña, Spain. andres@udc.es
authors.forename: A
authors.initials: A
authors.lastname: Martínez-Lage
authors.forename: F
authors.initials: F
authors.lastname: Rodríguez-Fariña
authors.forename: A
authors.initials: A
authors.lastname: González-Tizón
authors.forename: J
authors.initials: J
authors.lastname: Méndez
mesh_terms: D000818:Animals; D001483:Base Sequence; D049872:Bivalvia / Q000145:classification* / Q000235:genetics*; D004276:DNA, Satellite / Q000235:genetics*; D019143:Evolution, Molecular; D008969:Molecular Sequence Data; D010802:Phylogeny
chemical_list: D004276:DNA, Satellite