Article Document Academic Article Information Content Entity Journal Article Continuant Continuant Entity Entity Generically Dependent Continuant 2025-06-24T07:45:45 RDF description of Screening for LRRK2 G2019S and clinical comparison of Tunisian and North American Caucasian Parkinson's disease families - http://repository.healthpartners.com/individual/document-rn18837 22 <p>Mutations in the leucine-rich repeat kinase-2 gene (LRRK2) are responsible for some forms of familial as well as sporadic Parkinson's disease (PD). The purpose of this study was to examine the frequency of a single pathogenic mutation (6055G > A) in the kinase domain of this gene in United States and Tunisian familial PD and to compare clinical characteristics between patients with and without the mutation. Standardized case report forms were used for clinical and demographic data collection. We investigated the frequency of the most common substitution of LRRK2 (G2019S, 6055G>A) and its impact on epidemiological and phenotypic features. The frequency of mutations in Tunisian families was 42% (38/91) and in U.S. families 2.6% (1/39), with the unique opportunity to compare homozygous (n = 23) and heterozygous (n = 109) Tunisian carriers of G2019S substitutions. Individuals with G2019S substitutions had an older age at onset but few other differences compared with families negative for the substitution. Patients with LRRK2 mutations had typical clinical features of PD. Comparisons between individuals with heterozygous and homozygous LRRK2 mutations suggested that gene dosage was not correlated with phenotypic differences; however, the estimated penetrance was greater in homozygotes across all age groups.<p> Racial Groups 11361 Parkinson Disease 2022-02-21T22:48:57.408-06:00 Genetics Family public Screening Movement Disorders 1 document-rn18837 17302 10.1002/mds.21180 Screening for LRRK2 G2019S and clinical comparison of Tunisian and North American Caucasian Parkinson's disease families