THE ORIGIN OF CYTOLOGICALLY UNIDENTIFIABLE CHROMOSOME-ABNORMALITIES - 6 CASES ASCERTAINED BY TARGETED CHROMOSOME-BAND PAINTING

被引:56
作者
OHTA, T
TOHMA, T
SOEJIMA, H
FUKUSHIMA, Y
NAGAI, T
YOSHIURA, K
JINNO, Y
NIIKAWA, N
机构
[1] UNIV RYUKYUS,SCH MED,DEPT PEDIAT,NAHA,OKINAWA 903,JAPAN
[2] SAITAMA CHILDRENS HOSP,DIV MED GENET,SAITAMA,JAPAN
[3] KIYOSE METROPOLITAN HOSP,DEPT PEDIAT,TOKYO,JAPAN
关键词
D O I
10.1007/BF00216136
中图分类号
Q3 [遗传学];
学科分类号
071007 ; 090102 ;
摘要
De novo chromosome structural abnormalities cannot always be diagnosed by the use of standard cytogenetic techniques. We applied a previously developed chromosome-band-specific painting method to the diagnosis of such rearrangements. The diagnostic procedures consisted of microdissection of an aberrant chromosomal region of a given patient, polymerase chain reaction (PCR) amplification of the dissected chromosomal DNA, and subsequent competitive fluorescence in situ hybridization (FISH) using the PCR products as a probe pool on metaphase chromosomes from the patient and/or a karyotypically normal person. With this strategy, we studied 6 de novo rearrangements (6p+, 6q+, 9p+, 17p+, +mar, and +mar) in 6 patients. These rearrangements had been seen by conventional banding but their origin could not be identified. In all 6 patients, we successfully ascertained the origin. Using an aberrant region-specific probe pool, FISH signals appeared on both the aberrant region and a region of another specific chromosome pair. A reverse probe pool that was generated through the microdissection of normal chromosomes at a candidate region for the origin of the aberration hybridized with both the aberrant and the candidate regions. We thus diagnosed one patient with 17p+ as having trisomy for 14q32-qter, one with 9p+ as having trisomy for 12pter-p12, one with 6q+ as having a tandem duplication (trisomy) of a 6q23-q25 segment, one with 6p+ as having a tandem duplication (trisomy) of a 6p23-q21.3 segment, one with a supernumerary metacentric marker chromosome as having tetrasomy for 18pter-cen, and the last with an additional small marker chromosome as having trisomy for 18p11.1 (or p11.2)-q11.2. The present targeted chromosome-band-painting method provides the simple and rapid preparation of a probe pool for region-specific FISH, and is useful for the diagnosis of chromosome abnormalities of unknown origin.
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页码:1 / 5
页数:5
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