Prevalence of Huntington's disease gene CAG repeat alleles in sporadic amyotrophic lateral sclerosis patients.
Summary of "Prevalence of Huntington's disease gene CAG repeat alleles in sporadic amyotrophic lateral sclerosis patients."
A higher prevalence of intermediate ataxin-2 CAG repeats in amyotrophic lateral sclerosis (ALS) patients has raised the possibility that CAG expansions in other polyglutamine disease genes could contribute to ALS neurodegeneration. We sought to determine whether expansions of the CAG repeat of the HTT gene that causes Huntington's disease, are associated with ALS. We compared the HTT CAG repeat length on a total of 3144 chromosomes from 1572 sporadic ALS patients and 4007 control chromosomes, and also tested its possible effects on ALS-specific parameters, such as age and site of onset and survival rate. Our results show that the CAG repeat in the HTT gene is not a risk factor for ALS nor modifies its clinical presentation. These findings suggest that distinct neuronal degeneration processes are involved in these two different neurodegenerative disorders.
Center for Human Genetic Research, Massachusetts General Hospital , Boston, Massachusetts , USA.
This article was published in the following journal.
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/22409360
- DOI: http://dx.doi.org/10.3109/17482968.2011.653573
Medical and Biotech [MESH] Definitions
The constant presence of diseases or infectious agents within a given geographic area or population group. It may also refer to the usual prevalence of a given disease with such area or group. It includes holoendemic and hyperendemic diseases. A holoendemic disease is one for which a high prevalent level of infection begins early in life and affects most of the child population, leading to a state of equilibrium such that the adult population shows evidence of the disease much less commonly than do children (malaria in many communities is a holoendemic disease). A hyperendemic disease is one that is constantly present at a high incidence and/or prevalence rate and affects all groups equally. (Last, A Dictionary of Epidemiology, 3d ed, p53, 78, 80)
Variant forms of the same gene, occupying the same locus on homologous CHROMOSOMES, and governing the variants in production of the same gene product.
Loss Of Heterozygosity
The loss of one allele at a specific locus, caused by a deletion mutation; or loss of a chromosome from a chromosome pair, resulting in abnormal hemizygosity. It is detected when heterozygous markers for a locus appear monomorphic because one of the ALLELES was deleted. When this occurs at a tumor suppressor gene locus where one of the alleles is already abnormal, it can result in neoplastic transformation (CELL TRANSFORMATION, NEOPLASTIC).
The proportion of one particular in the total of all ALLELES for one genetic locus in a breeding POPULATION.
The different ways GENES and their ALLELES interact during the transmission of genetic traits that effect the outcome of GENE EXPRESSION.
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