Leigh syndrome is a heterogeneous disorder, usually due to a defect in oxidati ve metabolism. Mutations in SURF1 gene have been identified in patients with cyt ochrome c oxidase deficiency. We report a homozygous spli...Leigh syndrome is a heterogeneous disorder, usually due to a defect in oxidati ve metabolism. Mutations in SURF1 gene have been identified in patients with cyt ochrome c oxidase deficiency. We report a homozygous splice site deletion [516- 2 516-1delAG] in a young girl presenting with cytochrome c oxidase-deficient L eigh syndrome. Identification of molecular defect is indispensable for genetic c ounselling and prenatal diagnosis.展开更多
Haim-Munk syndrome (HMS) is a rare autosomal recessive disorder characterized clinically by abnormal palmoplantar hyperkeratosis and destruction of the periodontium, with hallmarks of onychogryphosis and arachnodactyl...Haim-Munk syndrome (HMS) is a rare autosomal recessive disorder characterized clinically by abnormal palmoplantar hyperkeratosis and destruction of the periodontium, with hallmarks of onychogryphosis and arachnodactyly. Germline mutations in the lysosomal protease cathepsin C gene (CTSC)have been described in a single patient with HMS and in several individuals with the clinically related disorderPapillon-Lef` evre syndrome (PLS). We describe a patient with HMS. We have analysed the cathepsin C gene in the proband and her mother. Sequence analysis of CTSC in the proband revealed a homozygous mutation at codon 196 (587T → C) within exon 4 that altered the conserved leucine to proline (Leu196Pro), whereas the patient’ s mother was heterozygous for that mutation. The same mutation has previously been described in an unrelated Brazilian family with PLS. An identical single missense mutation in the cathepsin C gene may underlie both PLS and HMS. These findings confirm that HMS and PLS are allelic variants of cathepsin C gene mutations and suggest that other factors (environmental or genetic) may be important determinants of the clinical phenotype of HMS and PLS.展开更多
文摘Leigh syndrome is a heterogeneous disorder, usually due to a defect in oxidati ve metabolism. Mutations in SURF1 gene have been identified in patients with cyt ochrome c oxidase deficiency. We report a homozygous splice site deletion [516- 2 516-1delAG] in a young girl presenting with cytochrome c oxidase-deficient L eigh syndrome. Identification of molecular defect is indispensable for genetic c ounselling and prenatal diagnosis.
文摘Haim-Munk syndrome (HMS) is a rare autosomal recessive disorder characterized clinically by abnormal palmoplantar hyperkeratosis and destruction of the periodontium, with hallmarks of onychogryphosis and arachnodactyly. Germline mutations in the lysosomal protease cathepsin C gene (CTSC)have been described in a single patient with HMS and in several individuals with the clinically related disorderPapillon-Lef` evre syndrome (PLS). We describe a patient with HMS. We have analysed the cathepsin C gene in the proband and her mother. Sequence analysis of CTSC in the proband revealed a homozygous mutation at codon 196 (587T → C) within exon 4 that altered the conserved leucine to proline (Leu196Pro), whereas the patient’ s mother was heterozygous for that mutation. The same mutation has previously been described in an unrelated Brazilian family with PLS. An identical single missense mutation in the cathepsin C gene may underlie both PLS and HMS. These findings confirm that HMS and PLS are allelic variants of cathepsin C gene mutations and suggest that other factors (environmental or genetic) may be important determinants of the clinical phenotype of HMS and PLS.
