PMID- 9609664 OWN - NLM STAT- MEDLINE DCOM- 19980729 LR - 20191102 IS - 0967-3849 (Print) IS - 0967-3849 (Linking) VI - 6 IP - 3 DP - 1998 Apr TI - Molecular cytogenetic analysis of heterochromatin in the chromosomes of tilapia, Oreochromis niloticus (Teleostei: Cichlidae). PG - 205-11 AB - The structure of the heterochromatic bands in mitotic chromosomes of the important tropical aquaculture species of tilapia, Oreochromis niloticus, was investigated by the combination of the C-banding technique, chromosomal digestion with two restriction endonucleases and fluorescence in situ hybridization (FISH) of two satellite DNAs (SATA and SATB). The tilapia chromosomes presented heterochromatic bands in the centromeres and in the short arms of almost all chromosomes that were differentially digested by the restriction endonucleases HaeIII and EcoRI. FISH of SATA showed that this satellite sequence is distributed in the centromeric region of all chromosomes of tilapia. FISH also revealed an intense hybridization signal for SATB in only one chromosome pair, but less intense signals were also present in several other pairs. The digestion of tilapia chromosomes by HaeIII and EcoRI was positively correlated with the position of SATA and SATB in chromosomes as revealed by FISH. The results obtained may be useful in future molecular and genetic studies of tilapias. FAU - Oliveira, C AU - Oliveira C AD - Departamento de Morfologia, Instituto de Biociencias, UNESP, Botucatu, Sao Paulo, Brazil. FAU - Wright, J M AU - Wright JM LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - Netherlands TA - Chromosome Res JT - Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology JID - 9313452 RN - 0 (DNA, Satellite) RN - 0 (Heterochromatin) SB - IM MH - Animals MH - Chromosome Banding MH - Chromosomes/*chemistry MH - DNA, Satellite/chemistry MH - Female MH - Heterochromatin/*genetics MH - Human Genome Project MH - In Situ Hybridization, Fluorescence MH - Male MH - Restriction Mapping MH - Tilapia/*genetics EDAT- 1998/06/03 00:00 MHDA- 1998/06/03 00:01 CRDT- 1998/06/03 00:00 PHST- 1998/06/03 00:00 [pubmed] PHST- 1998/06/03 00:01 [medline] PHST- 1998/06/03 00:00 [entrez] AID - 10.1023/a:1009211701829 [doi] PST - ppublish SO - Chromosome Res. 1998 Apr;6(3):205-11. doi: 10.1023/a:1009211701829.