Mutations in ABCD4 cause a new inborn error of vitamin B12 metabolism

Brian Fowler, David Rosenblatt and colleagues show that mutations in the ABC transporter gene ABCD4 cause a new inborn error of vitamin B 12 metabolism. ABCD4 colocalizes with the lysosomal proteins LAMP1 and LMBD1 and may be involved in intracellular processing of vitamin B 12 . Inherited disorders...

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Published inNature genetics Vol. 44; no. 10; pp. 1152 - 1155
Main Authors Coelho, David, Kim, Jaeseung C, Miousse, Isabelle R, Fung, Stephen, du Moulin, Marcel, Buers, Insa, Suormala, Terttu, Burda, Patricie, Frapolli, Michele, Stucki, Martin, Nürnberg, Peter, Thiele, Holger, Robenek, Horst, Höhne, Wolfgang, Longo, Nicola, Pasquali, Marzia, Mengel, Eugen, Watkins, David, Shoubridge, Eric A, Majewski, Jacek, Rosenblatt, David S, Fowler, Brian, Rutsch, Frank, Baumgartner, Matthias R
Format Journal Article
LanguageEnglish
Published New York Nature Publishing Group US 01.10.2012
Nature Publishing Group
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Summary:Brian Fowler, David Rosenblatt and colleagues show that mutations in the ABC transporter gene ABCD4 cause a new inborn error of vitamin B 12 metabolism. ABCD4 colocalizes with the lysosomal proteins LAMP1 and LMBD1 and may be involved in intracellular processing of vitamin B 12 . Inherited disorders of vitamin B 12 (cobalamin) have provided important clues to how this vitamin, which is essential for hematological and neurological function, is transported and metabolized. We describe a new disease that results in failure to release vitamin B 12 from lysosomes, which mimics the cblF defect caused by LMBRD1 mutations. Using microcell-mediated chromosome transfer and exome sequencing, we identified causal mutations in ABCD4 , a gene that codes for an ABC transporter, which was previously thought to have peroxisomal localization and function. Our results show that ABCD4 colocalizes with the lysosomal proteins LAMP1 and LMBD1, the latter of which is deficient in the cblF defect. Furthermore, we show that mutations altering the putative ATPase domain of ABCD4 affect its function, suggesting that the ATPase activity of ABCD4 may be involved in intracellular processing of vitamin B 12 .
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ISSN:1061-4036
1546-1718
DOI:10.1038/ng.2386