Efficient identification of marker chromosomes in 27 patients by stepwise hybridization with alpha-satellite DNA probes |
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Authors: | Rina Plattner Nyla A. Heerema Yuri B. Yurov Catherine G. Palmer |
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Affiliation: | (1) Department of Medical and Molecular Genetics, Indiana University School of Medicine, 975 West Walnut Street, 46202 Indianapolis, IN, USA;(2) All-Union Research Center of Mental Health, Academy of Medical Sciences of USSR, Zargorodnoe sh.2, 113152 Moscow, USSR |
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Abstract: | Using a procedure involving stepwise hybridization of alpha-satellite DNA probes at various conditions of stringency, 33 marker chromosomes from 27 patients were identified. The markers were ascertained prenatally in fetal amniotic fluid and chorionic villi samples or postnatally in blood from liveborn children. The marker chromosomes first were characterized by cytogenetic techniques and later identified by fluorescence in situ hybridization. There were 14 bisatellited markers, 3 metacentric nonsatellited marker chromosomes, 2 nonsupernumerary sex-chromosomal rings, and 9 patients carrying markers that appeared to be small rings. Multiple stringency conditions were used for the identification of 14 supernumerary ringlike chromosomes detected in 8 patients. Ring-like markers were initially screened at low stringency and grouped into alpha-satellite families. Subsequent higher stringency hybridization led to marker identification. Ringlike chromosomes originated from chromosomes 1, 2, 8, 12, 13 or 21, 14 or 22, 15, 18, and X. Multiple ringlike markers ascertained in a single patient were determined to originate from different chromosomes. |
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