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A unifying genetic model for facioscapulohumeral muscular dystrophy.
Science ; 329(5999): 1650-3, 2010 Sep 24.
Article em En | MEDLINE | ID: mdl-20724583
ABSTRACT
Facioscapulohumeral muscular dystrophy (FSHD) is a common form of muscular dystrophy in adults that is foremost characterized by progressive wasting of muscles in the upper body. FSHD is associated with contraction of D4Z4 macrosatellite repeats on chromosome 4q35, but this contraction is pathogenic only in certain "permissive" chromosomal backgrounds. Here, we show that FSHD patients carry specific single-nucleotide polymorphisms in the chromosomal region distal to the last D4Z4 repeat. This FSHD-predisposing configuration creates a canonical polyadenylation signal for transcripts derived from DUX4, a double homeobox gene of unknown function that straddles the last repeat unit and the adjacent sequence. Transfection studies revealed that DUX4 transcripts are efficiently polyadenylated and are more stable when expressed from permissive chromosomes. These findings suggest that FSHD arises through a toxic gain of function attributable to the stabilized distal DUX4 transcript.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Cromossomos Humanos Par 4 / Sequências Repetitivas de Ácido Nucleico / Proteínas de Homeodomínio / Distrofia Muscular Facioescapuloumeral Tipo de estudo: Prognostic_studies Limite: Adolescent / Adult / Aged / Child, preschool / Female / Humans / Male / Middle aged Idioma: En Ano de publicação: 2010 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Cromossomos Humanos Par 4 / Sequências Repetitivas de Ácido Nucleico / Proteínas de Homeodomínio / Distrofia Muscular Facioescapuloumeral Tipo de estudo: Prognostic_studies Limite: Adolescent / Adult / Aged / Child, preschool / Female / Humans / Male / Middle aged Idioma: En Ano de publicação: 2010 Tipo de documento: Article