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HNRNPA2B1 myopathy presenting in a family with an early onset oculopharyngeal muscular dystrophy-like phenotype.
Neuromuscular Disorders : NMD 2023 November 18
Genetic variation at HNRNPA2B1 is associated with inclusion body myopathy, Paget's disease and paediatric onset oculopharyngeal muscular dystrophy. We present a pedigree where a mother and two daughters presented with adolescent to early-adulthood onset of symptoms reminiscent of oculopharyngeal muscular dystrophy or chronic progressive external ophthalmoplegia, with a later limb-girdle pattern of weakness. Creatine Kinase was ∼1000 U/L. Myoimaging identified fatty replacement of sartorius, adductors longus and magnus, biceps femoris, semitendinosus and gastrocnemii. Muscle biopsies showed a variation of fibre size, occasional rimmed vacuoles and increased internalised myonuclei. Cases were heterozygous for a frameshift variant at HNRNPA2B1, consistent with a dominant and fully-penetrant mode of inheritance. Genetic variation at HNRNPA2B1 should be considered in adults with an oculopharyngeal muscular dystrophy-like or chronic progressive external ophthalmoplegia-like myopathy where initial testing fails to identify a cause.
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