Diagnostic Odyssey and Application of Targeted Exome Sequencing in the Investigation of Recurrent Infant Deaths in a Syrian Consanguineous Family: a Case of Spinal Muscular Atrophy with Respiratory Distress Type 1
- Author:
Young A KIM
1
;
Hye Young JIN
;
Yoo Mi KIM
Author Information
- Publication Type:Case Report
- Keywords: Exome Sequencing; Infant Death; Spinal Muscular Atrophy with Respiratory Distress Type 1
- MeSH: Carrier Proteins; Contracture; Exome; Failure to Thrive; Fetal Growth Retardation; Foot; Hand; Humans; Immunoglobulins; Infant Death; Infant; Metabolism; Motor Neurons; Muscle Weakness; Muscular Atrophy, Spinal; Neuromuscular Diseases; Respiratory Insufficiency
- From:Journal of Korean Medical Science 2019;34(9):e54-
- CountryRepublic of Korea
- Language:English
- Abstract: Spinal muscular atrophy with respiratory distress type 1 (SMARD1) is a rare autosomal recessive disorder caused by a defect in the immunoglobulin mu binding protein 2 (IGHMBP2) gene, leading to motor neuron degeneration. We identified an infant with SMARD1 by targeted exome sequencing from a consanguineous Syrian family having a history of recurrent infant deaths. The patient initially presented intrauterine growth retardation, poor sucking, failure to thrive, and respiratory failure at the age of two months, and an inborn error of metabolism was suspected at first. Over a period of one month, the infant showed rapid progression of distal muscular weakness with hand and foot contractures, which were suggestive of neuromuscular disease. Using targeted exome sequencing, the mutation in IGHMBP2 was confirmed, although the first report was normal. Targeted exome sequencing enabled identification of the genetic cause of recurrent mysterious deaths in the consanguineous family. Additionally, it is suggested that a detailed phenotypic description and communication between bioinformaticians and clinicians is important to reduce false negative results in exome sequencing.
