Abstract
Combined methylmalonic acidemia and homocystinuria, cblC type, is stated to be the most common inborn error of intracellular cobalamin metabolism. The disorder can display a wide spectrum of clinical manifestations, spanning the prenatal period through late adulthood. While increased homocysteine concentrations and impaired methyl group metabolism may contribute to disease-related complications, the characteristic macular and retinal degeneration seen in many affected patients appears to be unique to cblC disease. The early detection of cblC disease by newborn screening mandates a careful assessment of therapeutic approaches and provides a new opportunity to improve the outcome of affected patients. The following article reviews the current knowledge on the complications, pathophysiology, and outcome of cblC disease in an effort to better guide clinical practice and future therapeutic trials.
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Abbreviations
- cblC:
-
Cobalamin C disease
- CBS:
-
Cystathionine beta synthase
- CNCbl:
-
Cyanocobalamin
- IM:
-
Intramuscular
- MeCbl:
-
Methylcobalamin
- MMA:
-
Methylmalonic acid
- MTHFR:
-
Methylenetetrahydrofolate reductase
- OHCbl:
-
Hydroxocobalamin
- SAM:
-
S-Adenosylmethionine
- SCD:
-
Subacute combined degeneration of the spinal cord
- tHcy:
-
Total plasma homocysteine
- HcyTL:
-
Homocysteine thiolactone
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Communicated by: Johan Lodewijk Karel Van Hove
References to electronic databases: Methylmalonic aciduria and homocystinuria cblC type: OMIM #277400.
MMACHC gene: OMIM *609831.
Methionine synthase: EC 1.16.1.8.
Methylmalonyl-CoA mutase: EC 5.4.99.2.
Competing interests: None declared
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Supplementary Table 1
Ophthalmologic complications in patients with cblC disease (DOCX 191 kb)
Supplementary Table 2
Outcome of patients with cblC disease and their therapeutic regimens (DOCX 159 kb)
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Carrillo-Carrasco, N., Venditti, C.P. Combined methylmalonic acidemia and homocystinuria, cblC type. II. Complications, pathophysiology, and outcomes. J Inherit Metab Dis 35, 103–114 (2012). https://doi.org/10.1007/s10545-011-9365-x
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DOI: https://doi.org/10.1007/s10545-011-9365-x