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Neurology. 2011 Jan 18;76(3):219-26. doi: 10.1212/WNL.0b013e318207afeb. Epub 2010 Dec 22.

SPP1 genotype is a determinant of disease severity in Duchenne muscular dystrophy.

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  • 1Neuromuscular Center, Department of Neurosciences, University of Padova, 35128 Padova, Italy elena.pegoraro@unipd.it.

Abstract

OBJECTIVE:

Duchenne muscular dystrophy (DMD) is the most common single-gene lethal disorder. Substantial patient-patient variability in disease onset and progression and response to glucocorticoids is seen, suggesting genetic or environmental modifiers.

METHODS:

Two DMD cohorts were used as test and validation groups to define genetic modifiers: a Padova longitudinal cohort (n = 106) and the Cooperative International Neuromuscular Research Group (CINRG) cross-sectional natural history cohort (n = 156). Single nucleotide polymorphisms to be genotyped were selected from mRNA profiling in patients with severe vs mild DMD, and genome-wide association studies in metabolism and polymorphisms influencing muscle phenotypes in normal volunteers were studied.

RESULTS:

Effects on both disease progression and response to glucocorticoids were observed with polymorphism rs28357094 in the gene promoter of SPP1 (osteopontin). The G allele (dominant model; 35% of subjects) was associated with more rapid progression (Padova cohort log rank p = 0.003), and 12%-19% less grip strength (CINRG cohort p = 0.0003).

CONCLUSIONS:

Osteopontin genotype is a genetic modifier of disease severity in Duchenne dystrophy. Inclusion of genotype data as a covariate or in inclusion criteria in DMD clinical trials would reduce intersubject variance, and increase sensitivity of the trials, particularly in older subjects.

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PMID:
21178099
[PubMed - indexed for MEDLINE]
PMCID:
PMC3034396
Free PMC Article
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