Selective Forces Related to Spinocerebellar Ataxia Type 2 View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2019-04

AUTHORS

Lucas Schenatto Sena, Raphael Machado Castilhos, Eduardo Preusser Mattos, Gabriel Vasata Furtado, José Luiz Pedroso, Orlando Barsottini, Maria Marla Paiva de Amorim, Clecio Godeiro, Maria Luiza Saraiva Pereira, Laura Bannach Jardim

ABSTRACT

Spinocerebellar ataxia type 2 (SCA2) is caused by an unstable expanded CAG repeat tract (CAGexp) at ATXN2. Although prone to selective forces such as anticipation, SCA2 frequency seems to be stable in populations. Our aim was to estimate reproductive success, segregation patterns, and role of anticipation in SCA2. Adult subjects from families with molecular diagnosis provided data about all his/her relatives. Affected and unaffected sibs older than 65.7 years of age were used to estimate reproductive success and segregation patterns. Twenty-one SCA2 families were studied, including 1017 individuals (164 affected) who were born from 1840 to 2012. The median number of children of the non-carriers and carriers, among 99 subjects included in the reproductive success analysis, were 2 and 3 (p < 0.025), respectively. Therefore, the reproductive success of carriers was 1.5. There were 137 non-carriers (59.6%) and 93 carriers (40.4%) (p = 0.04), among subjects included in the segregation analysis. Age at onset across generations pointed to anticipation as a frequent phenomenon. We raised evidence in favor of increased reproductive success related to the carrier state at ATXN2, and segregation distortion favoring normal alleles. Since majority of normal alleles analyzed carried 22 repeats, we propose that this distortion segregation can be related to the high frequency of this allele in human chromosomes. More... »

PAGES

188-194

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s12311-018-0977-7

DOI

http://dx.doi.org/10.1007/s12311-018-0977-7

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1107037984

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30219976


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