mtDNA copy number associated with age of onset in familial amyloid polyneuropathy

• Type: Article in International Scientific Journal
• Date: 2018

Authors

Santos, D (Author) Other; Santos, MJ (Author) Other; Alves Ferreira, M (Author) Other; Coelho, T (Author) Other; Sequeiros, J (Author) Other; Alonso, I (Author) Other; oliveira, p (Author) ICBAS; Sousa, A (Author) Other; Carolina Lemos (Author) ICBAS; Grazina, M (Author) Other

Journal

Title: Journal of Neurology, Neurosurgery and Psychiatry

Vol. 89

Pages: 300-304

ISSN: 0022-3050

Publisher: BMJ PUBLISHING GROUP

Indexing

ISI Web of Knowledge - 4 Citations

Scopus - 9 Citations

Other information

Authenticus ID: P-00N-QE0

DOI: 10.1136/jnnp-2017-316657

Abstract (EN): Background Transthyretin-related familial amyloid polyneuropathy (TTR-FAP Val30Met) shows a wide variation in age-at-onset (AO) between generations and genders, as in Portuguese families, where women display a later onset and a larger anticipation (> 10 years). Mitochondrial DNA (mtDNA) copy number was assessed to clarify whether it has a modifier effect on AO variability in Portuguese patients. Methods The mtDNA copy number of 262 samples (175 Val30Met TTR carriers and 87 controls (proven Val30Val)) was quantified by quantitative real-time PCR. Statistical analysis was performed using IBM SPS V.23 software. Results This study shows that Val30Met TTR carriers have a significantly higher (p<0.001) mean mtDNA copy number than controls. Furthermore, the highest mtDNA copy number mean was observed in early-onset patients (AO <40 years). Importantly, early-onset offspring showed a significant increase (p=0.002) in the mtDNA copy number, when compared with their late AO parents. Conclusions The present findings suggest, for the first time, that mtDNA copy number may be associated with earlier events and may therefore be further explored as a potential biomarker for follow-up of TTR-FAP Val30Met carriers.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5