Exome Sequencing Identifies a DYNC1H1 Mutation in a Large Pedigree with Dominant Axonal Charcot-Marie-Tooth Disease
Identifieur interne : 004E94 ( Main/Curation ); précédent : 004E93; suivant : 004E95Exome Sequencing Identifies a DYNC1H1 Mutation in a Large Pedigree with Dominant Axonal Charcot-Marie-Tooth Disease
Auteurs : Michael N. Weedon [Royaume-Uni] ; Robert Hastings [Royaume-Uni] ; Richard Caswell [Royaume-Uni] ; Weijia Xie [Royaume-Uni] ; Konrad Paszkiewicz [Royaume-Uni] ; Thalia Antoniadi [Royaume-Uni] ; Maggie Williams [Royaume-Uni] ; Cath King [Royaume-Uni] ; Lynn Greenhalgh [Royaume-Uni] ; Ruth Newbury-Ecob [Royaume-Uni] ; Sian Ellard [Royaume-Uni]Source :
- American Journal of Human Genetics [ 0002-9297 ] ; 2011.
Abstract
Charcot-Marie-Tooth disease is characterized by length-dependent axonal degeneration with distal sensory loss and weakness, deep-tendon-reflex abnormalities, and skeletal deformities. It is caused by mutations in more than 40 genes. We investigated a four-generation family with 23 members affected by the axonal form (type 2), for which the common causes had been excluded by Sanger sequencing. Exome sequencing of three affected individuals separated by eight meioses identified a single shared novel heterozygous variant, c.917A>G, in
Url:
DOI: 10.1016/j.ajhg.2011.07.002
PubMed: 21820100
PubMed Central: 3155164
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<front><div type="abstract" xml:lang="en"><p>Charcot-Marie-Tooth disease is characterized by length-dependent axonal degeneration with distal sensory loss and weakness, deep-tendon-reflex abnormalities, and skeletal deformities. It is caused by mutations in more than 40 genes. We investigated a four-generation family with 23 members affected by the axonal form (type 2), for which the common causes had been excluded by Sanger sequencing. Exome sequencing of three affected individuals separated by eight meioses identified a single shared novel heterozygous variant, c.917A>G, in <italic>DYNC1H1</italic>
, which encodes the cytoplasmic dynein heavy chain 1 (here, <italic>novel</italic>
refers to a variant that has not been seen in dbSNP131or the August 2010 release of the 1000 Genomes project). Testing of six additional affected family members showed cosegregation and a maximum LOD score of 3.6. The shared <italic>DYNC1H1</italic>
gene variant is a missense substitution, p.His306Arg, at a highly conserved residue within the homodimerization domain. Three mouse models with different mutations within this domain have previously been reported with age-related progressive loss of muscle bulk and locomotor ability. Cytoplasmic dynein is a large multisubunit motor protein complex and has a key role in retrograde axonal transport in neurons. Our results highlight the importance of dynein and retrograde axonal transport in neuronal function in humans.</p>
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