NDLI: Genomic content and new insights on the origin of the B chromosome of the cichlid fish Astatotilapia latifasciata

Content Provider	Springer Nature Link
Author	Fantinatti, Bru E. A. Mazzuchelli, Juliana Valente, Guilherme T. Cabral de Mello, Diogo C. Martins, Cesar
Copyright Year	2012
Abstract	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.
Starting Page	1273
Ending Page	1282
Page Count	10
File Format	PDF
ISSN	00166707
Journal	Genetica
Volume Number	139
Issue Number	10
e-ISSN	15736857
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-01-29
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cytogenetics Evolution Genome Repeated DNA Supernumerary chromosome Plant Genetics & Genomics Human Genetics Life Sciences Animal Genetics and Genomics Microbial Genetics and Genomics
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science Medicine Animal Science and Zoology Insect Science

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