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Sonakar, Akhilesh K; Shamim, Uzma; Srivastava, MV Padma; Faruq, Mohd; Srivastava, Achal K
Parkinsonism & related disorders, August 2021, 2021-08-00, 20210801, Letnik: 89Journal Article
Spinocerebellar ataxia-2 is one of the most prevalent SCA type across the world and one of the commonest in India. We aimed to characterize SCA2 patients both clinically and genetically (ATXN2-CAG repeats and its haplotypic background). A total of 436 SCA2 patients were recruited consecutively comprising individuals of multiple ethnicities and two large multigenerational families. A detailed clinical evaluation and genetic analysis for CAG repeat length estimation and two marker based haplotype analysis rs695871 and rs695872 located 177 bp and 106 bp upstream of CAG sequence in Exon 1 of ATXN2 was performed. Generalized limb ataxia and slow saccades were prevalent features in majority of our patients, while hyporeflexia and extrapyramidal features were less commonly observed manifestations. Slow ocular saccades, upper limb ataxia and tremor showed significant associations with age of onset, CAG repeat length and disease duration. We observed a 100% association of C-C haplotype with the expanded ATXN2 repeats. This study represents the largest study of SCA2 Indian patients that highlights the clinico-genetic manifestations and haplotype analysis. A significant proportion of patients have not shown the characteristic slow saccades and hyporeflexia thus indicating the influences of other factors in modulation of the disease which warrants further investigations. The observation of CC haplotype in all our SCA2 patients indicates a common origin across all Indian sub populations and that also indicate a common global founder event in the past. •Large SCA2 study cohort (n = 436) from mixed Indian population and endogamous community.•Association of haplotype CC (rs695871 and rs695872) with expanded ATXN2 allele across all subpopulations.•Variable expression of slow saccades and areflexia among Indian SCA2 cases.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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