Roberts Syndrome (RBS) is an autosomal recessive disorder characterized by pre- and postnatal growth retardation, microcephaly, bilateral cleft lip and palate, and mesomelic symmetric limb reduction. Mental retardation is reported in the majority of affected individuals and mortality is high among severely affected fetuses and newborns. RBS is a chromosome cohesinopathy, and diagnosis typically relies upon cytogenetic testing in peripheral blood of individuals with suggestive clinical findings. However, bi-allelic mutations in the gene ESCO2 recently have been identified in all RBS patients tested. A number of different mutations in ESCO2 have been reported in these families. Exons 2 through 11 of ESCO2 are PCR amplified and subjected to bi-directional sequencing. All nucleotide variations suspected to be pathogenic for RBS are confirmed on a re-extracted DNA sample. Molecular testing of RBS is used for confirmation of a clinical diagnosis, carrier testing of individuals with a family history of the disorder and prenatal diagnosis.
Prior to ordering prenatal testing, please contact our laboratory at 212-241-7518 to discuss.
Please see info sheet below for more details.
1. Vega, H, Waisfisz, Q, Gordillo, M, Sakai, N, Yanagihara, I, Yamada, M, van Gosliga, D, Kayserili, H, Xu, C, Ozono, K, Jabs, EW, Inui, K, Joenje, H, Roberts syndrome is caused by mutations in ESCO2, a human homolog of yeast ECO1 that is essential for the establishment of sister chromatid cohesion. Nat Genet. 2005 May;37(5):468-70.
2. Schüle, B, Oviedo, A, Johnston, K, Pai, S, Francke, U. Inactivating mutations in ESCO2 cause SC phocomelia and Roberts syndrome: no phenotype-genotype correlation. Am J Hum Genet. 2005 Dec;77(6):1117-28.
Post-natal: Two 5-10 mL tubes of anticoagulated blood in EDTA (lavender top) or two 5-10 mL tubes of anticoagulated blood in ACD (yellow top).
- Chorionic Villi: 4 mg in conical tube with sterile saline OR transport media
- Amniotic Fluid: 15 ml in conical tube
- Cultured Cells: two confluent T-25 flasks
Additionally, please send:
- 5-10 ml maternal blood in EDTA (lavender top) required to perform MCC studies on all prenatal samples and in case maternal confirmation studies are necessary
- 5-10 ml paternal blood in EDTA (lavender top) in case paternal confirmation studies are necessary
Shipping: Send at room temperature.
Turnaround Time: 3-4 weeks
CPT Codes: 83891, 83898x12, 83904x12, 83912
Consent Form: Postnatal Consent form [PDF]
Requisition Form: General Test Requisition [PDF]
Additional Information: Roberts Syndrome Infosheet [PDF]