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15.01.2020 | Original Article

Frequency and distribution of polyQ disease intermediate-length repeat alleles in healthy Italian population

verfasst von: Alessia Mongelli, Stefania Magri, Elena Salvatore, Elena Rizzo, Anna De Rosa, Tommasina Fico, Marta Gatti, Cinzia Gellera, Franco Taroni, Caterina Mariotti, Lorenzo Nanetti

Erschienen in: Neurological Sciences | Ausgabe 6/2020

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Abstract

Background

Huntington disease (HD) and spinocerebellar ataxia type 1-2-17 (SCA1-2-17) are adult-onset autosomal dominant diseases, caused by triplet repeat expansions in the HTT, ATXN1, ATXN2, and TBP genes. Alleles with a repeat number just below the pathological threshold are associated with reduced penetrance and meiotic instability and are defined as intermediate alleles (IAs).

Objectives

We aimed to determine the frequencies of IAs in healthy Italian subjects and to compare the proportion of the IAs with the prevalence of the respective diseases.

Methods

We analyzed the triplet repeat size in HTT, ATXN1, ATXN2, and TBP genes in the DNA samples from 729 consecutive adult healthy Italian subjects.

Results

IAs associated with reduced penetrance were found in ATXN2 gene (1 subject, 0.1%) and TBP gene (0.82%). IAs at risk for meiotic instability were found in HTT (5.3%) and ATXN2 genes (2.7%). In ATXN1, we found a low percentage of IAs (0.4%). Alleles lacking the common CAT interruption within the CAG sequence were also rare (0.3%).

Conclusions

The high frequencies of IAs in HTT and ATXN2 genes suggest a correlation with the prevalence of the diseases in our population and support the hypothesis that IAs could represent a reservoir of new pathological expansions. On the opposite, ATXN1-IA were very rare in respect to the prevalence of SCA1 in our country, and TBP- IA were more frequent than expected, suggesting that other mechanisms could influence the occurrence of novel pathological expansions.

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Titel: Frequency and distribution of polyQ disease intermediate-length repeat alleles in healthy Italian population
verfasst von: Alessia Mongelli
Stefania Magri
Elena Salvatore
Elena Rizzo
Anna De Rosa
Tommasina Fico
Marta Gatti
Cinzia Gellera
Franco Taroni
Caterina Mariotti
Lorenzo Nanetti
Publikationsdatum: 15.01.2020
Verlag: Springer International Publishing
Erschienen in: Neurological Sciences / Ausgabe 6/2020
Print ISSN: 1590-1874
Elektronische ISSN: 1590-3478
DOI: https://doi.org/10.1007/s10072-019-04233-3

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Frequency and distribution of polyQ disease intermediate-length repeat alleles in healthy Italian population