نتایج جستجو برای: a3243g

تعداد نتایج: 187  

2000
Anne Chomyn José Antonio Enriquez Vicente Micol Patricio Fernandez-Silva Giuseppe Attardi

The pathogenetic mechanism of the mitochondrial tRNA A3243G transition associated with the mitochondrial myopathy, encephalopathy, lactic acidosis, and stroke-like episodes (MELAS) syndrome has been investigated in transmitochondrial cell lines constructed by transfer of mutant mitochondrial DNA (mtDNA)-carrying mitochondria from three genetically unrelated MELAS patients or of isogenic wild-ty...

Journal: :Clinical chemistry 2002
Diane K Hancock Frederick P Schwarz Fenhong Song Lee-Jun C Wong Barbara C Levin

BACKGROUND Most pathogenic human mitochondrial DNA (mtDNA) mutations are heteroplasmic (i.e., mutant and wild-type mtDNA coexist in the same individual) and are difficult to detect when their concentration is a small proportion of that of wild-type mtDNA molecules. We describe a simple methodology to detect low proportions of the single base pair heteroplasmic mutation, A3243G, that has been as...

Journal: :Folia neuropathologica 2016
W Zhiping L Quwen Z Hai Z Jian G Peiyi

AIM We report molecular imaging combined with gene diagnosis in a family with 7 members who carried an A3243G mutation in mitochondrial tRNA and p.Thr 137 Met in cationic trypsinogen (PRSS1) gene presented with mitochondrial encephalomyopathy, lactic acidosis, and stroke-like episodes (MELAS), diabetes, and recurrent pancreatitis. MATERIAL AND METHODS DNA sequencing was used to detect and val...

Journal: :Diabetes 2002
Alan T W Choo-Kang Stephen Lynn Geoffrey A Taylor Mark E Daly Sarbpreet S Sihota Teressa M Wardell Patrick F Chinnery Douglass M Turnbull Mark Walker

For any mitochondrial DNA (mtDNA) mutation, the ratio of mutant to wild-type mtDNA (% heteroplasmy) varies across tissues, with low levels in leukocytes and high levels in postmitotic tissues (e.g., skeletal muscle). Direct sequencing is the gold-standard method used to detect novel mutations, but can only reliably detect % heteroplasmy >25%, which is rare in leukocytes. Therefore, we investiga...

2008

Maternally inherited diabetes and deafness (MIDD) has been related to an A to G transition in the mitochondrial tRNA Leu (UUR) gene at the base pair 3243. This subtype of diabetes is characterized by maternal transmission, young age at onset and bilateral hearing impairment. Besides diabetes and deafness, the main diagnostic features, a wide range of multisystemic symptoms may be associated wit...

Journal: :Human molecular genetics 2009
Michelina Iacovino Caroline Granycome Hiroshi Sembongi Monika Bokori-Brown Ronald A Butow Ian J Holt Joseph M Bateman

Maintenance of an intact mitochondrial genome is essential for oxidative phosphorylation in all eukaryotes. Depletion of mitochondrial genome copy number can have severe pathological consequences due to loss of respiratory capacity. In Saccharomyces cerevisiae, several bifunctional metabolic enzymes have been shown to be required for mitochondrial DNA (mtDNA) maintenance. For example, Ilv5 is r...

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