caa a22 4500 445845309 CHVBK 20180317145357.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s10709-012-9629-x doi (NATIONALLICENCE)springer-10.1007/s10709-012-9629-x Genomic content and new insights on the origin of the B chromosome of the cichlid fish Astatotilapia latifasciata [Elektronische Daten] [Bruno Fantinatti, Juliana Mazzuchelli, Guilherme Valente, Diogo Cabral-de-Mello, Cesar Martins] B chromosomes are additional chromosomes widely studied in a diversity of eukaryotic groups, including fungi, plants and animals, but their origin, evolution and possible functions are not clearly understood. To further understand the genomic content and the evolutionary history of B chromosomes, classical and molecular cytogenetic analyses were conducted in the cichlid fish Astatotilapia latifasciata, which harbor 1-2 B chromosomes. Through cytogenetic mapping of several probes, including transposable elements, rRNA genes, a repeated DNA genomic fraction (C 0 t−1 DNA), whole genome probes (comparative genomic hybridization), and BAC clones from Oreochromis niloticus, we found similarities between the B chromosome and the 1st chromosome pair and chromosomes harboring rRNA genes. Based on the cytogenetic mapping data, we suggest the B chromosome may have evolved from a small chromosomal fragment followed by the invasion of the proto-B chromosome by several repeated DNA families. Springer Science+Business Media B.V., 2012 Cytogenetics nationallicence Evolution nationallicence Genome nationallicence Repeated DNA nationallicence Supernumerary chromosome nationallicence Fantinatti Bruno Departamento de Morfologia, Instituto de Biociências, UNESP—Universidade Estadual Paulista, CEP 18618-970, Botucatu, SP, Brazil aut Mazzuchelli Juliana Departamento de Morfologia, Instituto de Biociências, UNESP—Universidade Estadual Paulista, CEP 18618-970, Botucatu, SP, Brazil aut Valente Guilherme Departamento de Morfologia, Instituto de Biociências, UNESP—Universidade Estadual Paulista, CEP 18618-970, Botucatu, SP, Brazil aut Cabral-de-Mello Diogo Departamento de Biologia, Instituto de Biociências, UNESP—Universidade Estadual Paulista, Rio Claro, SP, Brazil aut Martins Cesar Departamento de Morfologia, Instituto de Biociências, UNESP—Universidade Estadual Paulista, CEP 18618-970, Botucatu, SP, Brazil aut Genetica Springer Netherlands 139/10(2011-10-01), 1273-1282 0016-6707 139:10<1273 2011 139 10709 https://doi.org/10.1007/s10709-012-9629-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10709-012-9629-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fantinatti Bruno Departamento de Morfologia, Instituto de Biociências, UNESP—Universidade Estadual Paulista, CEP 18618-970, Botucatu, SP, Brazil aut NATIONALLICENCE 700 1- Mazzuchelli Juliana Departamento de Morfologia, Instituto de Biociências, UNESP—Universidade Estadual Paulista, CEP 18618-970, Botucatu, SP, Brazil aut NATIONALLICENCE 700 1- Valente Guilherme Departamento de Morfologia, Instituto de Biociências, UNESP—Universidade Estadual Paulista, CEP 18618-970, Botucatu, SP, Brazil aut NATIONALLICENCE 700 1- Cabral-de-Mello Diogo Departamento de Biologia, Instituto de Biociências, UNESP—Universidade Estadual Paulista, Rio Claro, SP, Brazil aut NATIONALLICENCE 700 1- Martins Cesar Departamento de Morfologia, Instituto de Biociências, UNESP—Universidade Estadual Paulista, CEP 18618-970, Botucatu, SP, Brazil aut NATIONALLICENCE 773 0- Genetica Springer Netherlands 139/10(2011-10-01), 1273-1282 0016-6707 139:10<1273 2011 139 10709 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer