B chromosomes are apparently dispensable components found in the genomes of many species that are mainly composed of repetitive DNA sequences. Among the numerous questions concerning B chromosomes, the origin of these elements has been widely studied. To date, supernumerary chromosomes have been identified in approximately 60 species of fish, including species of the genus Reinhardt, 1867 in which these elements appear to have independently originated. In this study, we used molecular cytogenetic techniques to investigate the origin of B chromosomes in a population of Travassos, 1955 and determine their relationship with the extra chromosomes of other species of the genus. The results showed that the B chromosomes of had an intraspecific origin, apparently originated independently in relation to the B chromosomes of Travassos, 1956 Gomes, 1947 and Travassos, 1967, since they do not share specific DNA sequences, as well as their possible ancestral chromosomes and belong to different phylogenetic clades. The shared sequences between the supernumerary chromosomes and the autosommal sm pair indicate the origin of these chromosomes.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5599694 | PMC |
| http://dx.doi.org/10.3897/CompCytogen.v11i1.10886 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Friedreich Ataxia: An (Almost) 30-Year History After Gene Discovery.
Neurol Genet
February 2025
Department of Neurology and Neurosurgery, McGill University, Montreal, Canada.
In the late 1800s, Nikolaus Friedreich first described "degenerative atrophy of the posterior columns of the spinal cord," noting its connection to progressive ataxia, sensory loss, and muscle weakness, now recognized as Friedreich ataxia (FRDA). Renewed interest in the disease in the 1970s and 80s by the Quebec Cooperative Group and by Anita Harding led to the development of clinical diagnostic criteria and insights into associated biochemical abnormalities, although the primary defect remained unknown. In 1988, Susan Chamberlain mapped FRDA's location on chromosome 9.
View Article and Find Full Text PDFSynchronous clonally related anaplastic large cell lymphoma and malignant histiocytosis.
Diagn Pathol
January 2025
Laboratoire Hospitalier Universitaire de Bruxelles - Universitair Laboratorium Brussel, Université Libre de Bruxelles LHUB-ULB, Brussels, Belgium.
Background: Synchronous malignant histiocytoses are rare conditions that occur concurrently with another hematologic neoplasm. Most reported cases are associated with B-cell lymphoproliferative disorders, while associations with T-cell hemopathies are less common. These two diseases may share mutations and/or cytogenetic anomalies, which can lead to malignant proliferations.
View Article and Find Full Text PDFTriple mosaic variants of PURA in a patient with multiple congenital anomalies.
J Hum Genet
January 2025
Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Kanagawa, Japan.
In monogenic diseases, double mosaic variants of the same gene have rarely been identified. Here, we report the case of triple mosaic variants in PURA, a gene responsible for a neurodevelopmental syndrome (OMIM# 616158). Whole-exome sequencing identified three somatic PURA variants in our case with a similar neurodevelopmental syndrome: NM_005859.
View Article and Find Full Text PDFExercise intensity and training alter the innate immune cell type and chromosomal origins of circulating cell-free DNA in humans.
Proc Natl Acad Sci U S A
January 2025
Department of Pathology, Stanford University School of Medicine, Stanford, CA 94305.
Exercising regularly promotes health, but these benefits are complicated by acute inflammation induced by exercise. A potential source of inflammation is cell-free DNA (cfDNA), yet the cellular origins, molecular causes, and immune system interactions of exercise-induced cfDNA are unclear. To study these, 10 healthy individuals were randomized to a 12-wk exercise program of either high-intensity tactical training (HITT) or traditional moderate-intensity training (TRAD).
View Article and Find Full Text PDFDiversification and recurrent adaptation of the synaptonemal complex in Drosophila.
PLoS Genet
January 2025
Department of Zoology, University of British Columbia, Vancouver, British Columbia, Canada.
The synaptonemal complex (SC) is a protein-rich structure essential for meiotic recombination and faithful chromosome segregation. Acting like a zipper to paired homologous chromosomes during early prophase I, the complex is a symmetrical structure where central elements are connected on two sides by the transverse filaments to the chromatin-anchoring lateral elements. Despite being found in most major eukaryotic taxa implying a deeply conserved evolutionary origin, several components of the complex exhibit unusually high rates of sequence turnover.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!