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Ring chromosome 9 [r(9)(p24q34)]: A report of two cases
Author(s) -
Purandare Smita M.,
Lee Jiyun,
Hassed Susan,
Steele Marilyn I.,
Blackett Piers R.,
Mulvihill John J.,
Li Shibo
Publication year - 2005
Publication title -
american journal of medical genetics part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.064
H-Index - 112
eISSN - 1552-4833
pISSN - 1552-4825
DOI - 10.1002/ajmg.a.30382
Subject(s) - ring chromosome , ring (chemistry) , genetics , chromosome , biology , chemistry , karyotype , gene , organic chemistry
We report clinical and molecular cytogenetic studies in two patients with ring chromosome 9. Cytogenetics and fluorescent in situ hybridization (FISH) analysis using the p16 gene probe on 9p21, the ABL gene on 9q34, chromosome 9 alpha satellite‐centromeric probes, and TelVision 9p and 9q probes which identify subtelomere‐specific sequences on chromosome 9p and 9q, revealed 46,XX,r(9)(p24q34).ish r(9)(305J7‐T7‐,p16+,ABL+, D9S325−) and 46XY,r(9)(p24q34).ish r(9)(305J7‐T7‐,p16+,ABL+, D9S325−). Based on FISH analysis at least 115 kb was deleted on terminal 9p, and at least 95 kb from terminal 9q. In comparison with other reports of r(9), deletion 9p, and deletion 9q, both patients had clinical characteristics of ring 9 and additional features of deletion 9q or deletion 9p syndrome. The variability between the two cases with r(9) despite similar breakpoints identified by GTG‐banding and FISH may be explained by submicroscopic differences between deletion breakpoints, ring instability, interaction of other genes on the phenotype, and variation in fetal environmental conditions. © 2005 Wiley‐Liss, Inc.