Data/hora: 10/06/2024 03:00:00

Provedor de dados: 	Neotropical Ichthyology	
País: 	Brazil	
Título: 	Comparative cytogenetic analyses in Ancistrus species (Siluriformes: Loricariidae)	
Autores: 	Glugoski,Larissa; Deon,Geize; Schott,Stephane; Vicari,Marcelo R.; Nogaroto,Viviane; Moreira-Filho,Orlando.	
Data: 	2020-01-01	
Ano: 	2020	
Palavras-chave: 	Armored catfish; FISH; 5S rDNA; 18S rDNA; Telomeric sequence.	
Resumo: 	ABSTRACT Ancistrus is a specious genus of armored catfishes that has been extensively used for cytogenetic studies in the last 17 years. A comparison of the extensive karyotypic plasticity within this genus is presented with new cytogenetic analysis for Ancistrus cf. multispinis and Ancistrus aguaboensis. This study aims to improve our understanding of chromosomal evolution associated with changes in the diploid number (2n) and the dispersion of ribosomal DNAs (rDNAs) within Ancistrus. Ancistrus cf. multispinis and A. aguaboensis exhibit 2n of 52 and 50 chromosomes, respectively. Given that A. cf. multispinis shares a 2n = 52 also found in Pterygoplichthyini, the sister group for Ancistrini, a Robertsonian (Rb) fusion event is proposed for the 2n reduction in A. aguaboensis. 5S rDNAs pseudogenes sites have already been associated with Rb fusion in Ancistrus and our analysis suggests that the 2n reduction in A. aguaboensis was triggered by double strand breaks (DSBs) and chromosomal rearrangements at 5S rDNA sites. The presence of evolutionary breakpoint regions (EBRs) into rDNA cluster is proposed to explain part of the Rb fusion in Ancistrus. Cytogenetic data presented extends the diversity already documented in Ancistrus to further understand the role of chromosomal rearrangements in the diversification of Ancistrini.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252020000200217	
Editor: 	Sociedade Brasileira de Ictiologia	
Relação: 	10.1590/1982-0224-2020-0013	
Formato: 	text/html	
Fonte: 	Neotropical Ichthyology  v.18 n.2 2020	
Fonte: 	info:eu-repo/semantics/openAccess