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Ann Neurol. 2015 Nov;78(5):762-74. doi: 10.1002/ana.24511. Epub 2015 Sep 18.

Copy number variations in multiple sclerosis and neuromyelitis optica.

Author information

1
Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka.
2
Department of Medical Chemistry, Kurume University School of Medicine, Kurume.
3
Department of Neurological Therapeutics, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka.
4
Department of Clinical Research, Hokkaido Medical Center, Hokkaido.
5
Sapporo Neurology Clinic, Hokkaido, Japan.

Abstract

OBJECTIVE:

To clarify the potential association of copy number variations (CNVs) with multiple sclerosis (MS) and neuromyelitis optica (NMO) in Japanese cases.

METHODS:

Genome-wide association analyses of CNVs among 277 MS patients, 135 NMO/NMO spectrum disorder (NMOSD) patients, and 288 healthy individuals as a discovery cohort, and among 296 MS patients, 76 NMO/NMOSD patients, and 790 healthy individuals as a replication cohort were performed using high-density single nucleotide polymorphism microarrays.

RESULTS:

A series of discovery and replication studies revealed that most identified CNVs were 5 to 50kb deletions at particular T cell receptor (TCR) gamma and alpha loci regions. Among these CNVs, a TCR gamma locus deletion was found in 16.40% of MS patients (p = 2.44E-40, odds ratio [OR] = 52.6), and deletion at the TCR alpha locus was found in 17.28% of MS patients (p = 1.70E-31, OR = 13.0) and 13.27% of NMO/NMOSD patients (p = 5.79E-20, OR = 54.6). These CNVs were observed in peripheral blood T-cell subsets only, suggesting the CNVs were somatically acquired. NMO/NMOSD patients carrying the CNV tended to be seronegative for anti-aquaporin-4 antibody or had significantly lower titers than those without CNV.

INTERPRETATION:

Deletion-type CNVs at specific TCR loci regions contribute to MS and NMO susceptibility.

PMID:
26296936
DOI:
10.1002/ana.24511
[Indexed for MEDLINE]

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