Vitamin B6-responsive ornithine aminotransferase deficiency with a novel mutation G237D

Yumiko Ohkubo, Akihito Ueta, Tetsuya Ito, Satoshi Sumi, Mari Yamada, Katsuko Ozawa, Hajime Togari

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24 Citations (Scopus)

Abstract

Ornithine aminotransferase (OAT) deficiency (MIM: 258870) is a rare congenital metabolic disorder characterized by gyrate atrophy of the choroid and retina. Here, we report a 37-year-old male with gyrate atrophy of the choroid and retina who has been treated for 18 years. At the age of 7 years, the patient consulted an ophthalmologist due to progressive loss of vision. A large atrophied area was observed in his retina, and OAT deficiency was suspected. At the age of 19 years, amino acid analysis revealed high serum ornithine levels (1140 nmol/ml), with the normal range being 40-100 nmol/ml. He was treated with vitamin B6 300 mg/day for 6 months, which successfully reduced his serum ornithine levels by 20-30%. For 18 years since, his serum ornithine levels have been maintained with vitamin B6 medication. There was no further impairment of vision or increase in the atrophied area, as judged by ophthalmoscopic examination. OAT activity was undetected in white blood cells of the patient and was 105% and 45% of normal values in his wife and son, respectively. OAT gene analysis revealed a novel mutation of Gly237Asp in exon 7 (710G > A) in both alleles of the patient, while his son was a heterozygote for the mutation. Notably, this novel mutation is associated with a vitamin B6-responsive phenotype. Therefore, early diagnosis and treatment with vitamin B6 may prevent loss of vision in some patients with OAT deficiency.

Original languageEnglish
Pages (from-to)335-342
Number of pages8
JournalTohoku Journal of Experimental Medicine
Volume205
Issue number4
DOIs
Publication statusPublished - 04-2005

All Science Journal Classification (ASJC) codes

  • Biochemistry, Genetics and Molecular Biology(all)

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