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Italian Journal of Pediatrics

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Open Access 01-12-2021 | Hypoglycemia | Case report

Novel mutation in carnitine palmitoyltransferase 1A detected through newborn screening for a presymptomatic case in China: a case report

Authors: Yi Gan, Fei Yu, Haining Fang

Published in: Italian Journal of Pediatrics | Issue 1/2021

Abstract

Background

Carnitine palmitoyltransferase 1A (CPT1A) deficiency is a rare mitochondrial fatty acid oxidation (FAO) disorder that results in hypoketotic hypoglycemia and hepatic encephalopathy. It is caused by mutation in CPT1A. To date, only two symptomatic cases of CPT1A deficiency have been reported in China.

Case presentation

A newborn male, without any disease-related clinical manifestations, was diagnosed with CPT1A deficiency through newborn screening. Increased free carnitine levels and a significantly increased C0/(C16 + C18) ratio were detected by tandem mass spectrometry, and subsequently, mutations in CPT1A were found by gene sequence analysis. The patient was advised a low-fat, high-protein diet and followed up regularly. During three-years of follow-up since, the patient showed normal growth velocity and developmental milestones. Whole-exome sequence identified two mutations, c.2201 T > C (p.F734S) and c.1318G > A (p.A440T), in the patient. The c.2201 T > C mutation, which has been reported previously, was inherited from his father, while the c.1318G > A, a novel mutation, was inherited from his mother. The amino acid residues encoded by original sequences are highly conserved across different species. These mutations slightly altered the three-dimensional structure of the protein, as analyzed by molecular modeling, suggesting that they may be pathogenic.

Conclusion

This is the first case of CPT1A deficiency detected through newborn screening based on diagnostic levels of free carnitine, in China. Three years follow-up suggested that early diagnosis and diet management may improve the prognosis in CPT1A patient. In addition, we identified a novel mutation c.1318G > A in CPT1A,and a possible unique to Chinese lineage mutation c.2201 T > C. Our findings have expanded the gene spectrum of this rare condition and provided a basis for family genetic counseling and prenatal diagnosis.

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Title: Novel mutation in carnitine palmitoyltransferase 1A detected through newborn screening for a presymptomatic case in China: a case report
Authors: Yi Gan
Fei Yu
Haining Fang
Publication date: 01-12-2021
Publisher: BioMed Central
Keywords: Hypoglycemia
Neonatal Screening
Published in: Italian Journal of Pediatrics / Issue 1/2021
Electronic ISSN: 1824-7288
DOI: https://doi.org/10.1186/s13052-021-01094-5

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Novel mutation in carnitine palmitoyltransferase 1A detected through newborn screening for a presymptomatic case in China: a case report

Abstract

Background

Case presentation

Conclusion

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Background

Case presentation

Conclusion

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