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A founder mutation underlies a severe form of phosphoglutamase 3 (PGM3) deficiency in Tunisian patients
- Source :
- Molecular immunology. 90
- Publication Year :
- 2017
-
Abstract
- Phosphoglucomutase 3 (PGM3) protein catalyzes the conversion of N-acetyl-d-glucosamine-6-phosphate (GlcNAc-6-P) to N-acetyl-d-glucosamine-1-phosphate (GlcNAc-1-P), which is required for the synthesis of uridine diphosphate N-acetylglucosamine (UDP-GlcNAc) an important precursor for protein glycosylation. Mutations in PGM3 gene have been recently shown to underlie a new congenital disorder of glycosylation often associated to elevated IgE. Herein, we report twelve PGM3 deficient patients. They belong to three highly consanguineous families, originating from a rural district in the west central Tunisia. The patient's clinical phenotype is characterized by severe respiratory and cutaneous infections as well as developmental delay and severe mental retardation. Fourteen patients died in early infancy before diagnosis supporting the severity of the clinical phenotype. Laboratory findings revealed elevated IgE, CD4 lymphopenia and impaired T cell proliferation in most patients. Genetic analysis showed the presence, of a unique homozygous mutation (p.Glu340del) in PGM3 gene leading to reduced PGM3 abundance. Segregating analysis using fifteen polymorphic markers overlapping PGM3 gene showed that all patients inherited a common homozygous haplotype encompassing 10-Mb on chromosome 6. The founder mutational event was estimated to have occurred approximately 100 years ago. To date, (p.Glu340del) mutation represents the first founder mutation identified in PGM3 gene. These findings will facilitate the development of preventive approaches through genetic counselling and prenatal diagnosis in the affected families.
- Subjects :
- 0301 basic medicine
Male
Glycosylation
Tunisia
Adolescent
Genetic counseling
Immunology
Prenatal diagnosis
Consanguinity
Biology
medicine.disease_cause
03 medical and health sciences
0302 clinical medicine
medicine
Humans
Genetic Predisposition to Disease
Child
Molecular Biology
Gene
Genetics
Mutation
Haplotype
Homozygote
medicine.disease
Pedigree
030104 developmental biology
Haplotypes
Phosphoglucomutase
Genetic marker
Child, Preschool
Female
Congenital disorder of glycosylation
030215 immunology
Subjects
Details
- ISSN :
- 18729142
- Volume :
- 90
- Database :
- OpenAIRE
- Journal :
- Molecular immunology
- Accession number :
- edsair.doi.dedup.....771471e0a2d926a86bb2b7f43af969e1