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Cobalamin C disease is the most common complementation class of cobalamin disorders. Here, we present a case of a 14-yr-old male with early-onset cblC disease and autism spectrum disorder (ASD) admitted to our inpatient medical service for behavioral decompensation. We use this case to highlight key aspects of the neurodevelopmental and neuropsychiatric disorders associated with cblC disease. By incorporating a comprehensive review of existing literature, we highlight salient domains of psychological impairment in cblC disease, discuss the full range of neuropsychiatric presentations, and review clinical management implications unique to cblC disease.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8958916 | PMC |
http://dx.doi.org/10.1101/mcs.a006179 | DOI Listing |
Orphanet J Rare Dis
August 2025
Department of Pediatric Endocrinology and Genetic Metabolism, Xinhua Hospital, Shanghai Institute of Pediatric Research, Shanghai Jiao Tong University School of Medicine, 1665 KongJiang Road, Shanghai, 200092, China.
Objective: cblC deficiency is the most common organic acidemia in China. Hydroxocobalamin (OHCbl) is the main important therapeutic approach, while no approved protocols on its dosage during stable periods exist. This study aims to analyze OHCbl dosage and explore its influencing factors, providing reference for the option of OHCbl dosage.
View Article and Find Full Text PDFOrphanet J Rare Dis
August 2025
Department of Pediatrics, The Second Hospital of Hebei Medical University, Shijiazhuang, 050000, China.
Background: To investigate the clinical characteristics, treatment response, and prognosis of patients with methylmalonic acidemia (MMA) and homocysteinemia complicated by cardiovascular manifestations and to raise awareness regarding MMA and homocysteinemia.
Methods: A total of 16 children diagnosed with MMA and homocysteinemia with cardiovascular manifestations who were admitted to the Department of Pediatrics of the Second Hospital of Hebei Medical University from June 2018 to October 2024 were retrospectively analyzed.
Results: All 16 patients had varying degrees of neurological manifestations, and all had cardiovascular manifestations, 3 patients were diagnosed with MMA and homocysteinemia by newborn screening and received conventional treatment, the remaining 13 patients had nausea, vomiting, anemia, recurrent pneumonitis, respiratory distress, and lethargy as their first symptoms.
Eur Biophys J
June 2025
Institute of Biophysics, National Research Council, Palermo, Italy.
Vitamin B12 (cobalamin, Cbl) is a coordination compound of the cobalt, located at the center of a corrin ring composed of four pyrrolic-like groups. The cobalt ion can be bound to a variety of upper axial ligands, which vary among different cobalamin forms, including hydroxocobalamin (OHCbl), cyanocobalamin (CNCbl), methylcobalamin (MeCbl), and adenosylcobalamin (AdoCbl). MeCbl and AdoCbl are considered the biologically active forms, serving as cofactors in the metabolism of methylmalonic acid (MMA) and homocysteine (HCY).
View Article and Find Full Text PDFBackground: Methylmalonic acidemia combined with homocystinuria (cblC) can lead to infantile maculopathy. Although significant visual deterioration is commonly reported in early-onset cblC, we found poor awareness regarding formal assessments of ocular complications, especially in newborns, and of how these complications relate to the timing of therapy initiation. In this work, we present our experience and perform a literature review.
View Article and Find Full Text PDFMol Genet Metab
August 2025
Department of Pediatric Endocrinology and Genetic Metabolism, Xinhua Hospital, Shanghai Institute for Pediatric Research, Shanghai Jiaotong University School of Medicine, Shanghai 200092, China. Electronic address:
Background: Combined methylmalonic acidemia and homocystinuria cblC type (cblC) is a multisystemic disease with diverse clinical presentations and known genotype-phenotype correlations. This study aims to define and explain the phenotypes and outcomes associated with the MMACHC variant c.1A>G (p.
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