Detection of microdeletions in the short arm of the X chromosome by chromosome stretching

被引:6
作者
Kuechler, A
Mueller, CR
Liehr, T
Claussen, U
机构
[1] Inst Humangenet & Anthropol, D-07740 Jena, Germany
[2] Dept Radiat Oncol, D-07740 Jena, Germany
[3] Univ Wurzburg, Inst Human Genet, D-8700 Wurzburg, Germany
来源
CYTOGENETICS AND CELL GENETICS | 2001年 / 95卷 / 1-2期
关键词
D O I
10.1159/000057010
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
The present study was focused on the resolution of "chromosome stretching". In order to determine if this method can be used for the detection of microdeletions, the p-arms of 13 normal X chromosomes were stretched as well as of those with three different deletions of known size within the DMD/BMD region in Xp21 (case A: 0.42-0.45 Mb, case B: 2.3-19 Mb and case C: 3.0-3.5 Nib). The process of band splitting was recorded on a video-tape and the resulting banding pattern analyzed. Stretching of the normal Xp-arms led to a splitting on a maximum band level of 1400 and showed in all cases an identical banding pattern with 13 Giemsa-dark subbands. All new Giemsa-dark and -light subbands were derived from the three initial Giemsa-dark bands at the 400 band level according to ISCN (1995): five subbands from Xp21, four subbands from Xp11.3 and Xp22.2, respectively. The origin of these subbands is partly in contrast to the high resolution ISCN (1995) ideograms: subband Xp11.22 does not originate from the Giemsa-light band Xp11.2, but from the Giemsa-dark band Xp11.3; Xp22.12 originates from Xp21; Xp22.32 from Xp22.2. Stretching of the chromosomes containing deletions showed in cases A and B no differences in banding patterns and splitting order compared to normal X chromosomes. Only in patient C was a significant difference with the normal pattern visible due to the absence of one dark subband. In this case only four Giemsa-dark subbands derived from band Xp21. Thus, at least in the DMD/BMD region, the minimal size of a deletion detected by chromosome-stretching-generated high-resolution ideograms is about 3.0-3.5 Mb. Copyright (C) 2002 S. Karger AG, Basel.
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页码:12 / 16
页数:5
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