PMID- 8563757 OWN - NLM STAT- MEDLINE DCOM- 19960305 LR - 20131121 IS - 1061-4036 (Print) IS - 1061-4036 (Linking) VI - 12 IP - 2 DP - 1996 Feb TI - Chromosomal localization of long trinucleotide repeats in the human genome by fluorescence in situ hybridization. PG - 183-5 AB - Trinucleotide microsatellites are widespread in the human and other mammalian genomes. Expansions of unstable trinucleotide repeats have been associated so far with a number of different genetic diseases including fragile X, myotonic dystrophy (DM) and Huntington disease. While ten possible trinucleotides can occur at the DNA level, only CTG and CCG repeats are involved in the disorders described so far. However, the repeat expansion detection (RED) technique has identified additional large repeats of ATG, CCT, CTT, and TGG of potentially pathological significance in the human genome. We now show that conclusive information about the chromosomal localization of long trinucleotide repeats can be achieved in a relatively short time using fluorescence in situ hybridization (FISH) with biotin-labelled trinucleotide polymers. Large CTG expansions (> 1 kb) in DM and an unstable (CTG)306 repeat in a patient with schizophrenia were detected by eye through the microscope without electronic enhancement. Digital imaging was used to analyse the chromosomal distribution of long CCA and AGG repeats. Our results suggest that long trinucleotide repeats occur in the normal human genome and that the size of individual repeat loci may be polymorphic. FAU - Haaf, T AU - Haaf T AD - Max-Planck-Institute of Molecular Genetics, Berlin, Germany. FAU - Sirugo, G AU - Sirugo G FAU - Kidd, K K AU - Kidd KK FAU - Ward, D C AU - Ward DC LA - eng GR - MH-30929/MH/NIMH NIH HHS/United States GR - MH-39239/MH/NIMH NIH HHS/United States GR - MH-50390/MH/NIMH NIH HHS/United States GR - etc. PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Research Support, U.S. Gov't, P.H.S. PL - United States TA - Nat Genet JT - Nature genetics JID - 9216904 RN - 0 (DNA Probes) RN - 6SO6U10H04 (Biotin) SB - IM MH - Base Sequence MH - Biotin MH - Chromosome Mapping/*methods MH - DNA Probes MH - Genome MH - Humans MH - Image Processing, Computer-Assisted MH - In Situ Hybridization, Fluorescence/*methods MH - Molecular Sequence Data MH - Schizophrenia, Paranoid/genetics MH - Trinucleotide Repeats/*genetics EDAT- 1996/02/01 00:00 MHDA- 1996/02/01 00:01 CRDT- 1996/02/01 00:00 PHST- 1996/02/01 00:00 [pubmed] PHST- 1996/02/01 00:01 [medline] PHST- 1996/02/01 00:00 [entrez] AID - 10.1038/ng0296-183 [doi] PST - ppublish SO - Nat Genet. 1996 Feb;12(2):183-5. doi: 10.1038/ng0296-183.