Molecular characterisation and prenatal diagnosis of Asparto-acylase deficiency (Canavan disease)--report of two novel and two known mutations from the Indian subcontinent.
Indian J Pediatr 2013;
80:26-31. [PMID:
22878930 DOI:
10.1007/s12098-012-0862-1]
[Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2012] [Accepted: 07/11/2012] [Indexed: 10/28/2022]
Abstract
OBJECTIVES
To establish a technique for mutation identification and prenatal screening in confirmed cases of Canavan disease.
METHOD
Mutations in ASPA gene were identified by sequencing. Six exons of ASPA gene were amplified using intronic primers flanking the exons and then sequenced on ABI 3500Dx automated unit. This technique was used to identify mutations in three cases of Canavan disease. Prenatal diagnosis was performed in two families.
RESULTS
Two reported mutations c.162 C > A (p.Asn54Lys) and c.859 G > A (p.Ala287Thr) were identified in two different cases of Canavan disease. Third case was compound heterozygous for two novel mutations (c.728 T > G, p.Ile243Ser; c.902 T > C, p.Leu301Pro). Prenatal diagnosis was performed in three pregnancies in two families, two affected fetuses and one unaffected fetus were identified.
CONCLUSIONS
Molecular characterization of Canavan disease helps identify the cause at genetic level, thus confirming diagnosis and enabling identification of carriers in the family. Though enzyme assay and NAA measurement allows diagnosis and prenatal diagnosis of Canavan diasease, molecular methods have the advantage of bringing accuracy in prenatal testing with an earlier result. This is the first case report of mutation studies in Canavan disease from Indian subcontinent.
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