Abstract

Citrullinemia type I: molecular screening of the ASS1 gene by exonic sequencing and targeted mutation analysis

Author(s): R. Marquis-Nicholson, E. Glamuzina, D. Prosser, C. Wilson and D.R. Love

We developed a mutation-screening protocol for the ASS1 gene in order to guide clinical management of neonates with elevated citrulline detected during routine newborn screening. An exon-based amplification and sequencing method was designed and successfully applied to patients to identify disease-associated mutations. The sequencing-based method was applied to three patients with mild or asymptomatic clinical courses. Identification of a homozygous mutation in these patients, c.787G>A (p.Val263Met), led to the development of a tetra-primer ARMS-PCR method that successfully detected the mutation in DNA extracted from blood or from Guthrie card spots.

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