Bloom syndrome (BS) is an autosomal recessive disorder characterized clinically by proportionate pre- and postnatal growth deficiency, sun-sensitive, telangiectatic, hypo- and hyperpigmented skin, predisposition to malignancy, and chromosomal instability. BS is more prevalent in the Ashkenazi Jewish population with a carrier frequency of approximately 1 in 134. The most common mutation in this population, termed Blm Ash, is a 6 bp deletion and 7 bp insertion in the BLM gene (c.2207_2212delATCTGAinsTAGATTC (2281del6/ins7)). Testing for this mutation identifies approximately 99% of Ashkenazi Jewish carriers of BS. The American College of Medical Genetics recommends that carrier screening for BS be offered to individuals with at least one grandparent of Eastern European (Ashkenazi) Jewish ancestry before/during pregnancy.
Full gene sequencing is available for reproductive partners of known mutation carriers. Prenatal diagnosis is also available. Prior to ordering prenatal testing, please contact our laboratory at 212-241-7518 to discuss.
1. Ellis, N.A. et. al. The Bloom?s syndrome gene product is homologous to RecQ helicases. Cell 83:655-666, 1995.
2. Scott, S.A., Edelmann, L., Liu, L., Luo, M., Desnick, R.J. and Kornreich, R. Experience with carrier screening and prenatal diagnosis for sixteen Ashkenazi Jewish Genetic Diseases. Hum. Mutat. 31:1-11, 2010.
Two 5-10 ml tubes of anticoagulated blood. The preferred anticoagulant is EDTA (lavendar top tubes) or two 5-10 mL tubes of anticoagulated blood in ACD (yellow top).
Amniotic Fluid: 10ml in conical tube
Cultured Cells: two confluent T-25 flasks
Additionally, please send:
5-10ml paternal blood in EDTA (lavender top) in case paternal confirmation studies are necessary
Forms and Brochures
Carrier Screening Requisition and Consent[PDF]
Expanded Ashkenazi Jewish Carrier Screening Brochure[PDF]
Prior to ordering prenatal testing, please contact our laboratory at 212-241-7518 to discuss.