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POMT2 gene mutation in limb-girdle muscular dystrophy with inflammatory changes
Roberta Biancheri1, Antonio Falace, Alessandra Tessa
1Muscular and Neurodegenerative Disease Unit, G. Gaslini Institute and University of Genova, Largo Gaslini 5, 16147 Genova, Italy. roberta@biancheri.com
Biochemical and Biophysical Research Communications
|October 10, 2007
Summary
Defects in the POMT2 gene cause muscular dystrophies. A novel POMT2 mutation resulted in a mild limb-girdle muscular dystrophy (LGMD) phenotype without brain issues, now termed LGMD2N.
Area of Science:
- Genetics
- Neurology
- Biochemistry
Background:
- Defects in alpha-dystroglycan glycosylation are linked to muscular dystrophies.
- Mutations in the POMT2 gene are known to cause congenital muscular dystrophy with brain abnormalities, such as Walker-Warburg/muscle-eye-brain disease or microcephaly with cerebellar hypoplasia.
Observation:
- A patient presented with a mild limb-girdle muscular dystrophy (LGMD) phenotype, significantly elevated serum creatine kinase, and no brain involvement.
- Muscle biopsy showed myopathic and inflammatory changes, alongside a severe reduction in alpha-dystroglycan.
Findings:
- A homozygous missense mutation in the POMT2 gene was identified in the patient.
- This mutation is associated with a milder clinical presentation than previously described POMT2-related disorders.
Implications:
- This finding expands the clinical spectrum of POMT2-related muscular dystrophies.
- The identified phenotype is proposed to be designated as limb-girdle muscular dystrophy type 2N (LGMD2N).
- This expands understanding of genotype-phenotype correlations in dystroglycanopathies.
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