Heterogeneity in Roberts syndrome

American Journal of Medical Genetics
D J Allingham-Hawkins, D J Tomkins

Abstract

Roberts syndrome (RS) is a rare, autosomal recessive condition characterized primarily by growth retardation, developmental delay, and limb anomalies. Some RS patients (RS+), but not others (RS-), have an abnormality of their constitutive heterochromatin (the "RS effect"). RS+ patients also show a cellular hypersensitivity to DNA damaging agents such as mitomycin C (MMC). Lymphoblastoid cell lines from 2 unrelated RS+ patients were fused and hybrid cells examined for correction of the RS effect and MMC hypersensitivity. Neither cellular defect was corrected in the 2 hybrid cell lines examined, suggesting that these 2 patients represent a single complementation group. Fusions were also performed between one RS+ cell line and 2 different RS- cell lines. In both fusions, the hybrids demonstrated correction of both the heterochromatin abnormality and MMC hypersensitivity. These observations suggest that RS+ and RS- patients belong to different complementation groups and do not arise from the same single gene mutation.

References

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Citations

Jan 20, 1997·American Journal of Medical Genetics·T J de RavelC A Wright
Aug 5, 2000·American Journal of Medical Genetics·L D McDanielR A Schultz
Mar 1, 1996·Human Genetics·G MèhesK Mèhes
Dec 10, 2002·Journal of Medical Genetics·K L GreenhalghR A Newbury-Ecob
Oct 23, 1997·American Journal of Medical Genetics·M UrbanP Krietsch

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