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DNA methylation age-acceleration is associated with disease duration and age at onset in C9orf72 patients.
- Source :
-
Acta neuropathologica [Acta Neuropathol] 2017 Aug; Vol. 134 (2), pp. 271-279. Date of Electronic Publication: 2017 Apr 24. - Publication Year :
- 2017
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Abstract
- The repeat expansion in C9orf72 is the most common cause of amyotrophic lateral sclerosis and frontotemporal dementia. C9orf72 patients present with a wide range in disease duration and age of onset. The strongest risk factor for both syndromes is aging, which was linked to DNA methylation (DNAm) age based on the cumulative assessment of the methylation levels of 353 CpGs included on the genome-wide 450k BeadChip. DNAm age may reflect biological age better than chronological age. We conducted a genome-wide blood DNA methylation study of 46 unrelated C9orf72 patients. After correction for multiple testing, none of the CpGs demonstrated association between its methylation level and disease duration or age of onset. However, we detected a significant reverse correlation of DNAm age-acceleration with disease duration and age of onset, suggesting that for every 5-year increase in DNAm age-acceleration there is a 3.2-year earlier age of onset and 1.5-year shorter disease duration. The significant correlations remain after adjusting for gender, TMEM106B genotypes, disease phenotype and C9orf72 5'CpG island methylation status. A similar trend was observed for the blood DNA of affected members of an extended C9orf72 family; and tissues from the central nervous system of C9orf72 autopsy cases. For instance, regression analysis suggested that a 5-year increase in DNAm age-acceleration is linked to an earlier age of onset by 4.7 or 5.5 years for frontal cortex or spinal cord, respectively. Blood DNAm age may be a useful biomarker for biological age, because blood DNAm age-acceleration was similar to all investigated brain tissues, except for cerebellum that ages more slowly. In conclusion, DNA methylation analysis of C9orf72 patients revealed that increased DNAm age-acceleration is associated with a more severe disease phenotype with a shorter disease duration and earlier age of onset.
- Subjects :
- Age of Onset
Aged
Aged, 80 and over
Amyotrophic Lateral Sclerosis pathology
Central Nervous System metabolism
Central Nervous System pathology
Family Health
Female
Frontotemporal Dementia pathology
Genetic Testing
Humans
Male
Middle Aged
Aging
Amyotrophic Lateral Sclerosis genetics
C9orf72 Protein genetics
DNA Methylation genetics
DNA Repeat Expansion genetics
Frontotemporal Dementia genetics
Subjects
Details
- Language :
- English
- ISSN :
- 1432-0533
- Volume :
- 134
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- Acta neuropathologica
- Publication Type :
- Academic Journal
- Accession number :
- 28439722
- Full Text :
- https://doi.org/10.1007/s00401-017-1713-y