Double trouble: combined myophosphorylase and AMP deaminase deficiency in a child homozygous for nonsense mutations at both loci.

Abstract

A 2-yr-old boy had congenital hypotonia, limb weakness, exercise intolerance and one episode of myoglobinuria. Histochemical and biochemical analysis of muscle showed a combined defect of phosphorylase and AMP deaminase. DNA analysis showed that the child was homozygous for the mutations commonly found in both McArdle's disease and AMP deaminase deficiency. The father was heterozygous for both mutations. The mother was heterozygous for the myophosphorylase gene mutation and homozygous for the mutation in the AMP deaminase 1 gene.

• Authors: S Tsujino, S Shanske, J E Carroll, R L Sabina, S DiMauro
• Journal: Neuromuscular disorders : NMD (Neuromuscul Disord) Vol. 5 Issue 4 Pg. 263-6 (Jul 1995) ISSN: 0960-8966 [Print] England
• PMID: 7580237 (Publication Type: Case Reports, Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, P.H.S.)

Chemical References

• Codon, Nonsense
• Phosphorylases
• AMP Deaminase

Topics

• AMP Deaminase (deficiency, genetics)
• Base Sequence
• Child, Preschool
• Codon, Nonsense (metabolism)
• Female
• Homozygote
• Humans
• Male
• Molecular Sequence Data
• Mutation (physiology)
• Pedigree
• Phenotype
• Phosphorylases (deficiency, genetics)