Abstract:
:Spinal muscular atrophy (SMA) is caused by functional loss of the survival of motor neuron 1 (SMN1) gene. Despite genetic homogeneity, phenotypic variability indicates the involvement of disease modifiers. SMN1 is located in 5q13.2 segmental duplication, enriched in genes and prone to unequal rearrangements, which results in copy number polymorphism (CNP). We examined the influence of CNP of 5q13.2 genes and their joint effect on childhood-onset SMA phenotype. Multiplex ligation-dependent probe amplification (MLPA) was used to construct 5q13.2 alleles and assess copy number of the SMN2, small EDRK-rich factor 1A (SERF1A) and NLR family apoptosis inhibitory protein (NAIP) genes in 99 Serbian patients with SMN1 homozygous absence (23-type I, 37-type II and 39-mild type III) and 122 patients' parents. Spearman rank test was performed to test correlation of individual genes and SMA type. Generalized linear models and backward selection were performed to obtain a model explaining phenotypic variation with the smallest set of variables. 5q13.2 alleles most commonly associated with type I harbored large-scale deletions, while those detected in types II and III originated from conversion of SMN1 to SMN2. Inverse correlation was observed between SMN2, SERF1A and NAIP CNP and SMA type (P=2.2e-16, P=4.264e-10, P=2.722e-8, respectively). The best minimal model describing phenotypic variability included SMN2 (P<2e-16), SERF1A (P<2e-16) and their interaction (P=0.02628). SMN2 and SERF1A have a joint modifying effect on childhood-onset SMA phenotype.
journal_name
J Hum Genetjournal_title
Journal of human geneticsauthors
Brkušanin M,Kosać A,Jovanović V,Pešović J,Brajušković G,Dimitrijević N,Todorović S,Romac S,Milić Rašić V,Savić-Pavićević Ddoi
10.1038/jhg.2015.104subject
Has Abstractpub_date
2015-11-01 00:00:00pages
723-8issue
11eissn
1434-5161issn
1435-232Xpii
jhg2015104journal_volume
60pub_type
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