A wide spectrum of clinical and brain MRI findings in patients with SLC19A3 mutations

Kenichiro Yamada, Kiyokuni Miura, Kenju Hara, Motomasa Suzuki, Keiko Nakanishi, Toshiyuki Kumagai, Naoko Ishihara, Yasukazu Yamada, Ryozo Kuwano, Shoji Tsuji, Nobuaki Wakamatsu

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Abstract

Background: SLC19A3 (solute carrier family 19, member 3) is a thiamin transporter with 12 transmembrane domains. Homozygous or compound heterozygous mutations in SLC19A3 cause two distinct clinical phenotypes, biotin-responsive basal ganglia disease and Wernicke's-like encephalopathy. Biotin and/or thiamin are effective therapies for both diseases.Methods: We conducted on the detailed clinical, brain MRI and molecular genetic analysis of four Japanese patients in a Japanese pedigree who presented with epileptic spasms in early infancy, severe psychomotor retardation, and characteristic brain MRI findings of progressive brain atrophy and bilateral thalami and basal ganglia lesions.Results: Genome-wide linkage analysis revealed a disease locus at chromosome 2q35-37, which enabled identification of the causative mutation in the gene SLC19A3. A pathogenic homozygous mutation (c.958G > C, [p.E320Q]) in SLC19A3 was identified in all four patients and their parents were heterozygous for the mutation. Administration of a high dose of biotin for one year improved neither the neurological symptoms nor the brain MRI findings in one patient.Conclusion: Our cases broaden the phenotypic spectrum of disorders associated with SLC19A3 mutations and highlight the potential benefit of biotin and/or thiamin treatments and the need to assess the clinical efficacy of these treatments.

Original languageEnglish
Article number171
JournalBMC Medical Genetics
Volume11
Issue number1
DOIs
Publication statusPublished - 22-12-2010

All Science Journal Classification (ASJC) codes

  • Genetics
  • Genetics(clinical)

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    Yamada, K., Miura, K., Hara, K., Suzuki, M., Nakanishi, K., Kumagai, T., Ishihara, N., Yamada, Y., Kuwano, R., Tsuji, S., & Wakamatsu, N. (2010). A wide spectrum of clinical and brain MRI findings in patients with SLC19A3 mutations. BMC Medical Genetics, 11(1), [171]. https://doi.org/10.1186/1471-2350-11-171