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The p. R151C Polymorphism in MC1R Gene Modifies the Age of Onset in Spanish Huntington’s Disease Patients

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Abstract

The expansion of CAG repeats (≥36 CAG) in the HTT gene is the only known genetic cause of Huntington’s disease (HD) and the main determinant of the course of the disease. The length of the expanded CAG repeats correlates inversely with the age of onset (AOO) but does not completely determine it. We investigated the role of the melanocortin 1 receptor (MC1R) gene as a modifier factor of AOO in 600 HD patients from Spain. We sequenced the entire region of the MC1R gene and analyzed all the nonsynonymous MC1R genetic variants with a minor allele frequency of at least 0.01 in HD patients. The variability in AOO attributable to the CAG repeats and MC1R polymorphisms was evaluated using a multiple linear regression model. We found that the loss-of-function p. R151C MC1R polymorphism has a significant influence on the AOO (P = 0.004; Bonferroni-corrected P = 0.032) which explains 1.42% of the variance in AOO that cannot be accounted for by the expanded CAG repeat. Our results suggest that the MC1R gene could modify the AOO in Spanish HD patients and encourage the evaluation of loss-of-function MC1R polymorphisms in other HD populations with a higher frequency of these MC1R polymorphisms.

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Acknowledgements

We are grateful to the patients for participating in the study, to the geneticists for providing DNA samples, and to Pablo Gonzalez Navarro, technician from the Department of Genetics-Jimenez Diaz Foundation University Hospital (IIS-FJD), for his work in relation to this project.

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Correspondence to Susana Puig.

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The authors declare that they have no conflict of interest.

Funding

The research at the Melanoma Unit in Barcelona is partially funded by the Grants from Fondo de Investigaciones Sanitarias (12/00840) Spain, by the AGAUR 2014_SGR_603 of the Catalan Government, Spain, by the European Commission under the 6th Framework Programme, Contract nr: LSHC-CT-2006-018702 (GenoMEL), and by the National Cancer Institute (NCI) of the US National Institute of Health (NIH) (CA83115). Miriam Potrony is the recipient of a PhD Fellowship FI14/00231 (PFIS) from Instituto de Salud Carlos III, Spain.

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Montserrat Milà and Susana Puig contributed equally to this work.

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Tell-Marti, G., Puig-Butille, J.A., Gimenez-Xavier, P. et al. The p. R151C Polymorphism in MC1R Gene Modifies the Age of Onset in Spanish Huntington’s Disease Patients. Mol Neurobiol 54, 3906–3910 (2017). https://doi.org/10.1007/s12035-016-0305-5

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  • DOI: https://doi.org/10.1007/s12035-016-0305-5

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