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 in | Nature genetics Vol. 44; no. 10; pp. 1152 - 1155 |
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Main Authors | , , , , , , , , , , , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
New York
Nature Publishing Group US
01.10.2012
Nature Publishing Group |
Subjects | |
Online Access | Get full text |
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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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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 1061-4036 1546-1718 |
DOI: | 10.1038/ng.2386 |