Mitotic and Meiotic Behavior of B Chromosomes in Crenicichla lepidota: New Report in the Family Cichlidae

The Journal of Heredity
Larissa B PiresAna Lucia Dias

Abstract

B chromosomes are additional genetic elements to the standard complement. They display distinctive features and have been found in 15% of eukaryote species. In this study, we analyzed 4 populations of Crenicichla lepidota from hydrographic system of Laguna dos Patos/RS (Brazil). All specimens showed 2n = 48 with 6m + 42st - a, FN = 54, with a secondary constriction on the first pair of the complement. Among the 18 samples analyzed, 6 individuals belonging to the Gasômetro and Saco da Alemoa populations presented 1-3 small-sized heterochromatic B chromosomes, with intra- and interindividual variation. Simple AgNORs coincident with 18S rDNA and CMA3 positive/DAPI negative sites were present in all populations. The extra chromosomes did not exhibit any 18S rDNA sites. The meiotic analyses showed heteropycnotic regions in leptotene and zygotene stages, which may be related to the presence of B chromosomes. During pachytene were found 24 bivalents and 1 spatially separated, as well as during metaphases I and diplotene, indicating that there is no association between B chromosomes and those of the A complement. During diakinesis, an unusual meiotic configuration was observed, revealing a proximity between the bivalent and chromosome ...Continue Reading

References

May 1, 1986·Proceedings of the National Academy of Sciences of the United States of America·D PinkelJ W Gray
Nov 1, 1972·Experimental Cell Research·A T Sumner
Mar 21, 2000·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·J P CamachoL W Beukeboom
Aug 5, 2004·Cytogenetic and Genome Research·E FeldbergD C Benzaquem
Sep 9, 2004·The Journal of Cell Biology·Anthony Kar Lun LeungAngus I Lamond
Feb 28, 2006·Genetica·G D C Severi-AguiarM T V Azeredo-Oliveira
Nov 30, 2007·Histochemistry and Cell Biology·Valentina SirriDanièle Hernandez-Verdun
Apr 23, 2010·Journal of Fish Biology·M C GrossE Feldberg
Apr 15, 2011·Genetics and Molecular Research : GMR·M R BegueliniE Morielle-Versute
Apr 8, 2014·Genome Génome / Conseil National De Recherches Canada·Tatiane R SampaioAna Lúcia Dias

❮ Previous
Next ❯

Citations

Dec 20, 2015·Zebrafish·Isabel Araújo OliveiraPaulo Roberto Antunes de Mello Affonso
Sep 16, 2016·The Journal of Heredity·Frances E ClarkThomas D Kocher
May 1, 2019·Biology Open·Luan Felipe da Silva FradeRenata Coelho Rodrigues Noronha
Dec 20, 2018·Genes·Frances E ClarkThomas D Kocher
Feb 7, 2021·Genes & Genomics·Cesar Martins, Maryam Jehangir

❮ Previous
Next ❯

Related Concepts

Related Feeds

Cell Migration

Cell migration is involved in a variety of physiological and pathological processes such as embryonic development, cancer metastasis, blood vessel formation and remoulding, tissue regeneration, immune surveillance and inflammation. Here is the latest research.