Promoter Variant Alters Expression of the Autophagic BECN1 Gene: Implications for Clinical Manifestations of Machado-Joseph Disease View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2017-12

AUTHORS

Nadiya Kazachkova, Mafalda Raposo, Amanda Ramos, Rafael Montiel, Manuela Lima

ABSTRACT

Autophagy is especially important in disorders where accumulation of the mutant protein is a hallmark, such as the Machado-Joseph disease/spinocerebellar ataxia type 3 (MJD/SCA3). We analyzed the promoter of the BECN1 gene, whose overexpression has been reported to exert neuroprotective effects in MJD, with the aim of finding variants that could be associated with expression levels of beclin-1 and could be tested as modifiers of onset and disease severity. A fragment encompassing the BECN1 promoter was sequenced in 95 MJD subjects and 120 controls. The impact of the variation detected on transcription factors (TFs) binding affinity was evaluated in silico and inferences concerning levels of expression were confirmed by fluorescence-based quantitative real-time PCR in a subset of 28 MJD subjects and 26 controls. Four previously described (rs60221525, rs116943570, rs34882610, and rs34037822) and one novel (c.-933delG) variants were identified. In silico analysis performed for the most frequent variants-rs60221525 C allele and rs116943570 T allele-predicted an impact of the presence of these alleles on TF binding affinity. BECN1 expression levels were in agreement with the in silico predictions, showing a tendency for decreased levels in samples with the rs60221525 C allele and for increased levels in samples with the rs116943570 T allele. MJD patients carrying the rs60221525 C allele presented a tendency for earlier estimated age at onset. Moreover, patients with the rs60221525 C allele presented a more severe clinical picture, compared to patients without this allele. The analysis of a larger number of patients from different cohorts, currently unavailable, would be required to confirm these results. More... »

PAGES

957-963

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s12311-017-0875-4

DOI

http://dx.doi.org/10.1007/s12311-017-0875-4

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1090605865

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/28699106


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60 schema:description Autophagy is especially important in disorders where accumulation of the mutant protein is a hallmark, such as the Machado-Joseph disease/spinocerebellar ataxia type 3 (MJD/SCA3). We analyzed the promoter of the BECN1 gene, whose overexpression has been reported to exert neuroprotective effects in MJD, with the aim of finding variants that could be associated with expression levels of beclin-1 and could be tested as modifiers of onset and disease severity. A fragment encompassing the BECN1 promoter was sequenced in 95 MJD subjects and 120 controls. The impact of the variation detected on transcription factors (TFs) binding affinity was evaluated in silico and inferences concerning levels of expression were confirmed by fluorescence-based quantitative real-time PCR in a subset of 28 MJD subjects and 26 controls. Four previously described (rs60221525, rs116943570, rs34882610, and rs34037822) and one novel (c.-933delG) variants were identified. In silico analysis performed for the most frequent variants-rs60221525 C allele and rs116943570 T allele-predicted an impact of the presence of these alleles on TF binding affinity. BECN1 expression levels were in agreement with the in silico predictions, showing a tendency for decreased levels in samples with the rs60221525 C allele and for increased levels in samples with the rs116943570 T allele. MJD patients carrying the rs60221525 C allele presented a tendency for earlier estimated age at onset. Moreover, patients with the rs60221525 C allele presented a more severe clinical picture, compared to patients without this allele. The analysis of a larger number of patients from different cohorts, currently unavailable, would be required to confirm these results.
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