title: Highly repetitive DNA sequence in parthenogenetic Artemia.
abstract: The study of the structural organization of the eukaryotic genome is one of the most important tools for disclosing the evolutionary relationships between species. Artemia (Crustacea, Phyllopoda) offers a very interesting model for speciation studies. The genus, distributed all over the world, comprises both bisexual sibling species and parthenogenetic populations, exhibiting different chromosome numbers (diploidy, polyploidy, and heteroploidy). Digestion of genomic DNA of the parthenogenetic Artemia sp. from Tsing-Tao (China) with the restriction enzymes Eco RI and Alu I reveals that a highly repetitive sequence of 133 bp is present. The Eco RI fragment has been cloned and characterized by genomic organization. The distribution of the Eco RI family of repeats was also studied in several bisexual and parthenogenetic Artemia populations and compared with an Alu I repetitive fragment previously identified in Artemia franciscana.
authors.affiliation: Dipartimento di Genetica e di Biologia dei Microrganismi, Università degli Studi di Milano, Italy.
authors.forename: G
authors.initials: G
authors.lastname: Badaracco
authors.forename: G
authors.initials: G
authors.lastname: Tubiello
authors.forename: R
authors.initials: R
authors.lastname: Benfante
authors.forename: F
authors.initials: F
authors.lastname: Cotelli
authors.forename: D
authors.initials: D
authors.lastname: Maiorano
authors.forename: N
authors.initials: N
authors.lastname: Landsberger
mesh_terms: D000818:Animals; D001156:Artemia / Q000235:genetics*; D001483:Base Sequence; D005075:Biological Evolution; D002869:Chromosome Aberrations; D003001:Cloning, Molecular; D004247:DNA / Q000737:chemistry*; D005787:Gene Frequency; D008969:Molecular Sequence Data; D010312:Parthenogenesis / Q000235:genetics*; D012091:Repetitive Sequences, Nucleic Acid; D015183:Restriction Mapping; D012727:Sex Characteristics
chemical_list: D004247:DNA