title: American College of Medical Genetics and Genomics Standards and Guidelines for Clinical Genetics Laboratories, 2014 edition: technical standards and guidelines for Huntington disease.
abstract: Huntington disease is an autosomal-dominant neurodegenerative disease of mid-life onset caused by expansion of a polymorphic trinucleotide (CAG) repeat. Variable penetrance for alleles carrying 36-39 repeats has been noted, but the disease appears fully penetrant when the repeat numbers are >40. An abnormal CAG repeat may expand, contract, or be stably transmitted when passed from parent to child. Assays used to diagnose Huntington disease must be optimized to ensure the accurate and unambiguous quantitation of CAG repeat length. This document provides an overview of Huntington disease and methodological considerations for Huntington disease testing. Examples of laboratory reports are also included.
authors.affiliation: Department of Human Genetics, Emory University School of Medicine, Atlanta, Georgia, USA.
authors.forename: Lora
authors.initials: L
authors.lastname: Bean
authors.affiliation: Department of Pathology, University of Utah School of Medicine and ARUP Laboratories, Salt Lake City, Utah, USA.
authors.forename: Pinar
authors.initials: P
authors.lastname: Bayrak-Toydemir
mesh_terms: D000293:Adolescent; D000328:Adult; D000483:Alleles; D001483:Base Sequence; D017931:DNA Primers / Q000235:genetics; D056726:Genetic Association Studies; D020022:Genetic Predisposition to Disease; D005826:Genetics, Medical / Q000592:standards*; D023281:Genomics / Q000592:standards*; D006801:Humans; D006816:Huntington Disease / Q000175:diagnosis* / Q000235:genetics*; D008969:Molecular Sequence Data; D019683:Penetrance; D016133:Polymerase Chain Reaction; D011296:Prenatal Diagnosis / Q000379:methods; D015995:Prevalence; D012955:Societies, Medical; D019680:Trinucleotide Repeat Expansion; D018911:Trinucleotide Repeats; D014481:United States; D055815:Young Adult
chemical_list: D017931:DNA Primers