Synonyms: CblC defect | Cobalamin C defect | Combined defect in adenosylcobalamin and methylcobalamin synthesis, type cblC | Methylmalonic aciduria with homocystinuria, type cblC
cblC type methylmalonic acidemia with homocystinuria is a form of methylmalonic acidemia with homocystinuria (see this term) an inborn error of vitamin B12 (cobalamin) metabolism characterized by megaloblastic anemia lethargy failure to thrive developmental delay intellectual deficit and seizures.
Data from Orphanet are used to provide information on a disease's name, synonym(s), and overview. Reference: Access aggregated data from Orphanet at Orphadata. Orphadata: Free access data from Orphanet. © INSERM 1999. Available on http://www.orphadata.org. Data version April 2026
Newly diagnosed with
Methylmalonic acidemia with homocystinuria, type cblC?
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Advocacy Organizations
Charcot-Marie-Tooth Association
Our mission … to support the development of new treatments for CMT, to improve the quality of life for people with CMT, and, ultimately, to find a cure. Our vision … a world without CMT. CMTA was started by patients in 1986, and to this day is powered by a community of patients who are engaged in helping carry out and support our mission.
HCU network america
HCU Network America strives to inform and provide resources for patients and families, create connections, influence state and federal policy, and support the advancement of diagnosis and treatment for HCU and related disorders.
Louisiana Metabolic Disorders Coalition
We support, educate, and advocate for patients & families affected by metabolic disorders.
Mississippi Metabolics Foundation
Our mission at Mississippi Metabolics Foundation (MMF) is to advocate, educate, and support families in MS affected by genetic metabolic disorders/inborn errors of metabolism (IEM's). MMF promotes initiatives and further advancements in legislation, education, research, clinical trials, studies, therapies, targeted treatments, and eventual cures for IEM’s and all rare diseases.
Organic Acidemia Association
We are a 501c3 non-profit organization made up of parents of children with organic acidemia metabolic disorders. Organic Acidemias are a group of inheritable genetic metabolic disorders in which there is a defect in protein metabolism where an essential enzyme is absent or malfunctioning. Our mission is to empower families and health care professionals with knowledge in these disorders. We suppor
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Clinical Trials
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