High frequency of beta-propeller protein-associated neurodegeneration (BPAN) among patients with intellectual disability and young-onset parkinsonism

Kenya Nishioka, Genko Oyama, Hiroyo Yoshino, Yuanzhe Li, Takashi Matsushima, Chisen Takeuchi, Yoko Mochizuki, Madoka Mori-Yoshimura, Miho Murata, Chikara Yamasita, Norimichi Nakamura, Yohei Konishi, Kazuki Ohi, Keiji Ichikawa, Tatsuhiro Terada, Tomokazu Obi, Manabu Funayama, Shinji Saiki, Nobutaka Hattori
Neurobiology of Aging 2015, 36 (5): 2004.e9-2004.e15
Neurodegeneration with brain iron accumulation (NBIA) is a genetically heterogeneous disorder, characterized by the accumulation of iron in regions such as the basal ganglia. We enrolled 28 patients with childhood intellectual disability and young-onset parkinsonism (≤40 years at onset) and 4 patients with infantile neuroaxonal dystrophy. All had been clinically diagnosed, and the prevalence of genetic mutations linked to NBIA (PANK2 [exons 1-7], PLA2G6 [exons 2-17], C19orf12 [exons 1-3], WDR45 [exons 2-11], COASY [exons 1-9], FA2H [exons 1-7], and RAB39B [exons 1, 2]) was evaluated. We detected 7 female patients (25.0%, 7 of 28) with de novo heterozygote WDR45 mutations, which are known to be pathogenic for beta-propeller protein-associated neurodegeneration. All 7 patients had common clinical features. Pathogenic mutations in other NBIA genes were not found. We also screened 98 patients with early-onset parkinsonism without intellectual disability and 110 normal controls of Japanese origin for WDR45 mutations. None had WDR45 mutations. Our data suggest a high frequency of beta-propeller protein-associated neurodegeneration mutations in the Japanese population.

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