Journal
AMERICAN JOURNAL OF MEDICAL GENETICS PART A
Volume 152A, Issue 7, Pages 1764-1769Publisher
WILEY
DOI: 10.1002/ajmg.a.33426
Keywords
deletion; 4q34; no phenotypic effect; non-pathogenic; gene paucity; de novo
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Cytogenetically visible imbalances without phenotypic effect are still rare despite the extent of large-scale copy number variation in the normal population revealed by array CGH. Here we report on a phenotypically normal 30-year-old female with a de novo, cytogenetically visible, interstitial deletion of band 4q34. She was referred following three successive miscarriages, one of which was an intra-uterine death with subendocardial fibroelastosis and dilated cardiomyopathy. There was no other notable medical or family history, she was of normal intelligence and had no dysmorphic features. FISH and Array CGH with a customized 1 Mb BAC array showed that the deletion is a minimum of 9.3 and a maximum of 10.7 Mb in size, between similar to 173 Mb in 4q34.1 and similar to 182 Mb in 4q34.3. The deletion contains only 23 known coding genes giving a low average gene density of similar to 2 genes/Mb. This case further illustrates that (1) sizeable imbalances can be associated with apparent phenotypic normality, (2) gene density is a better guide to possible phenotypic consequences than aberration size, and (3) it is not always safe to assume that de novo imbalances will be causal. (C) 2010 Wiley-Liss, Inc.
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