alexa A familial cryptic subtelomeric deletion 12p with variable phenotypic effect
Reproductive Medicine

Reproductive Medicine

Clinics in Mother and Child Health

Author(s): Baker E, Hinton L, Callen DF, Haan EA, Dobbie A

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A 15-year-old-boy and his mother, both carrying a cryptic deletion within 12p13.33, are described. The proband has a mild phenotype with moderate mental retardation and severe behavioural problems. The mother had some learning difficulties at school. Conventional GTL-banded high-resolution chromosome analysis showed normal karyotypes. Subsequent analysis by fluorescence in situ hybridization using a set of probes specific for the subtelomeric regions of all chromosomes, plus a series of probes at 12p13.33 extending from the 12p telomere, showed that both mother and son carry a 1.65 Mb terminal deletion in this region. There are 10 predicted genes within the deleted region. The unanticipated familial nature of the deletion emphasizes the value of family studies in all cases with subtelomeric abnormalities. It also demonstrates the difficulty in making a clinical diagnosis of individuals with this deletion. To the best of the present authors' knowledge, the proband and his mother are the first patients described with a submicroscopic deletion at 12p13.33.

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This article was published in Clin Genet and referenced in Clinics in Mother and Child Health

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