Novel SLC5A6 mutations lead to B lymphocyte maturation defects with metabolic abnormality rescuable by biotin replenishment

Chu Han Hsieh, Ju Lee, Hsiang Hsuan Sung, Ya Fang Huang, Yu Sian Ding, Chia Yi Li, Chia Liang Yen, Chao Kai Hsu, Chun Keung Yu, Hsin Ying Hsieh, Michael Warren Hughes, Peng Chieh Chen, Chi Chang Shieh

Research output: Contribution to journalArticlepeer-review

Abstract

We characterized a family diagnosed with immunodeficiency disease presenting with low immunoglobulin levels and skin dyskeratosis. Exome sequencing revealed compound heterozygous missense variants in SLC5A6, the gene encoding a cellular sodium-dependent multivitamin transporter (SMVT) responsible for transporting vitamins, including biotin (vitamin B7). We showed that the biotin deficiency was caused by the SLC5A6 variants resulting in defective B cell differentiation and antibody deficiency. Altered cellular metabolic profiles, including aberrant mitochondrial respiration and reliance on glycolysis, may underlie the failure in plasma cell maturation. Replenishment of biotin improved plasma cell maturation and recovered the antibody producing activity in the patient and in a CRISPR-Cas9 gene-edited mouse model bearing a patient-specific SLC5A6 variant. Our results demonstrate the critical role of metabolic reprogramming in the maturation of plasma cells and nominate SLC5A6 as a causative gene for immunodeficiency that may be treated by biotin replenishment.

Original languageEnglish
Article number109855
JournalClinical Immunology
Volume257
DOIs
Publication statusPublished - 2023 Dec

All Science Journal Classification (ASJC) codes

  • Immunology and Allergy
  • Immunology

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