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Case Reports
Journal Article
HLA-genotyping by next-generation-sequencing reveals shared and unique HLA alleles in two patients with coexisting neuromyelitis optica spectrum disorder and thymectomized myasthenia gravis: Immunological implications for mutual aetiopathogenesis?
Multiple Sclerosis and related Disorders 2022 July
The exact immunopathogenesis, genetic mechanisms and triggering factors underlying myasthenia gravis (MG) and neuromyelitis optica (NMO) remain unknown and the coexistence may underline an aetiopathogenetic link be- tween these two diseases. We report the cases of two thymectomized patients with acetylcholine receptor (AChR) antibody (Ab)-positive MG who eventually developed AQP4-NMO. Next-Generation Sequencing (NGS) analysis showed that patient-1 had two HLA alleles previously associated with MG, mainly HLA-A*01:01:01 and HLA-DRB1*03:01, present in a haplotype in Caucasian MG patients (HLA-A1-B8-DR3-DQ2). Patient-2, expressed HLA-C*07:01:01, a well characterized MG risk factor and HLA-DQB1*05:02:01, previously described both in MG and NMO patients. Finally, we observed two common alleles in patient 1 and 2, HLA-DQA1*05:01:01 and HLA-DPB1*04:02:01. We believe that this study provides clinical evidence of the role of specific HLA alleles in rare forms of combined human peripheral and CNS autoimmunity, a fact that enhances the aim towards tailor-made therapeutic decision making.
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