NDLI: The B chromosomes of the African cichlid fish Haplochromis obliquidens harbour 18S rRNA gene copies

Content Provider	Springer Nature : BioMed Central
Author	Poletto, Andréia B Ferreira, Irani A Martins, Cesar
Abstract	Background Diverse plant and animal species have B chromosomes, also known as accessory, extra or supernumerary chromosomes. Despite being widely distributed among different taxa, the genomic nature and genetic behavior of B chromosomes are still poorly understood. Results In this study we describe the occurrence of B chromosomes in the African cichlid fish Haplochromis obliquidens. One or two large B chromosome(s) occurring in 39.6% of the analyzed individuals (both male and female) were identified. To better characterize the karyotype and assess the nature of the B chromosomes, fluorescence in situ hybridization (FISH) was performed using probes for telomeric DNA repeats, 18S and 5S rRNA genes, SATA centromeric satellites, and bacterial artificial chromosomes (BACs) enriched in repeated DNA sequences. The B chromosomes are enriched in repeated DNAs, especially non-active 18S rRNA gene-like sequences. Conclusion Our results suggest that the B chromosome could have originated from rDNA bearing subtelo/acrocentric A chromosomes through formation of an isochromosome, or by accumulation of repeated DNAs and rRNA gene-like sequences in a small proto-B chromosome derived from the A complement.
Related Links	https://bmcgenomdata.biomedcentral.com/counter/pdf/10.1186/1471-2156-11-1.pdf
Ending Page	8
Page Count	8
Starting Page	1
File Format	HTM / HTML
ISSN	27306844
DOI	10.1186/1471-2156-11-1
Journal	BMC Genomic Data
Issue Number	1
Volume Number	11
Language	English
Publisher	BioMed Central
Publisher Date	2010-01-05
Access Restriction	Open
Subject Keyword	Life Sciences Animal Genetics and Genomics Microbial Genetics and Genomics Plant Genetics and Genomics Genetics and Population Dynamics Bacterial Artificial Chromosome Repetitive DNAs rDNA Site rDNA Cluster rDNA Copy
Content Type	Text
Resource Type	Article
Subject	Health Informatics Genetics
Journal Impact Factor	1.9/2023
5-Year Journal Impact Factor	1.9/2023

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The B chromosomes of the African cichlid fish Haplochromis obliquidens harbour 18S rRNA gene copies

Erratum to The B chromosome of the cichlid fish Haplochromis obliquidens harbors 18S rRNA genes

The B chromosome of the cichlid fish Haplochromis obliquidens harbors 18S rRNA genes

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The B chromosomes of the African cichlid fish Haplochromis obliquidens harbour 18S rRNA gene copies

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The B chromosomes of the African cichlid fish Haplochromis obliquidens harbour 18S rRNA gene copies

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