PMID- 10761113 OWN - NLM STAT- MEDLINE DCOM- 20000427 LR - 20220321 IS - 0016-6707 (Print) IS - 0016-6707 (Linking) VI - 105 IP - 3 DP - 1999 TI - NOR polymorphism in the Iberian species Chondrostoma lusitanicum (Pisces: Cyprinidae)--re-examination by FISH. PG - 301-3 AB - Chromosomal polymorphism regarding the number of chromosomal NOR sites in the cyprinid fish Chondrostoma lusitanicum reported previously (Rodrigues & Collares-Pereira, 1996) was re-examined using fluorescence in situ hybridization (FISH) with a ribosomal DNA (rDNA) probe. All positive CMA3-bands contained ribosomal DNA documented by either two or four FISH positive signals in the respective karyotypes. This polymorphism suggests the occurrence of structural rearrangements of translocation type in rDNA region from one ancestral NOR-bearing chromosome pair ubiquitous among leuciscine cyprinid fishes to another pair. The absence of individuals heterozygous for this polymorphism is discussed. FAU - Collares-Pereira, M J AU - Collares-Pereira MJ AD - Centro de Biologia Ambiental/Departamento de Zoologia e Antropologia, Faculdade de Ciencias, Lisboa, Portugal. mcolares@fc.ul.pt FAU - Rab, P AU - Rab P LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - Netherlands TA - Genetica JT - Genetica JID - 0370740 SB - IM MH - Animals MH - Cyprinidae/*genetics MH - In Situ Hybridization, Fluorescence MH - Nucleolus Organizer Region/*genetics MH - *Polymorphism, Genetic EDAT- 2000/04/13 09:00 MHDA- 2000/04/29 09:00 CRDT- 2000/04/13 09:00 PHST- 2000/04/13 09:00 [pubmed] PHST- 2000/04/29 09:00 [medline] PHST- 2000/04/13 09:00 [entrez] AID - 10.1023/a:1003885922023 [doi] PST - ppublish SO - Genetica. 1999;105(3):301-3. doi: 10.1023/a:1003885922023.