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GTR Home > Conditions/Phenotypes > Methylmalonic acidemia with homocystinuria, type cblX

Methylmalonic acidemia with homocystinuria, type cblX

Synonyms
INTELLECTUAL DEVELOPMENTAL DISORDER, X-LINKED 3
Modes of inheritance
X-linked recessive inheritance (Orphanet)

Summary

Excerpted from the GeneReview: Disorders of Intracellular Cobalamin Metabolism
Disorders of intracellular cobalamin metabolism have a variable phenotype and age of onset that are influenced by the severity and location within the pathway of the defect. The prototype and best understood phenotype is cblC; it is also the most common of these disorders. The age of initial presentation of cblC spans a wide range: In utero with fetal presentation of nonimmune hydrops, cardiomyopathy, and intrauterine growth restriction. Newborns, who can have microcephaly, poor feeding, and encephalopathy. Infants, who can have poor feeding and slow growth, neurologic abnormality, and, rarely, hemolytic uremic syndrome (HUS). Toddlers, who can have poor growth, progressive microcephaly, cytopenias (including megaloblastic anemia), global developmental delay, encephalopathy, and neurologic signs such as hypotonia and seizures. Adolescents and adults, who can have neuropsychiatric symptoms, progressive cognitive decline, thromboembolic complications, and/or subacute combined degeneration of the spinal cord.
Full text of GeneReview (by section):
Summary
GeneReview Scope
Diagnosis
Clinical Characteristics
Genetically Related (Allelic) Disorders
Differential Diagnosis
Management
Genetic Counseling
Resources
Molecular Genetics
Chapter Notes
References
Authors:
Jennifer L Sloan
Nuria Carrillo
David Adams
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Available tests

33 tests are in the database for this condition.

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Clinical tests (33 available)

Biochemical Genetics Tests

Molecular Genetics Tests

Genes See tests for all associated and related genes

  • Also known as: CFF, HCF, HCF-1, HCF1, HFC1, MAHCX, MRX3, PPP1R89, VCAF, XLID3, HCFC1
    Summary: host cell factor C1

Clinical features

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Imported from Human Phenotype Ontology (HPO)

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Reviews

Clinical resources

Practice guidelines

  • ACMG ACT, 2022
    American College of Medical Genetics and Genomics, Newborn Screening ACT Sheet, Elevated C3 Acylcarnitine, Propionic Acidemia (PA) and Methylmalonic Acidemia (MMA), 2022
  • ACMG Algorithm, 2022
    American College of Medical Genetics and Genomics, Algorithm, Propionic and Methylmalonic Acidemia: C3 Elevated, 2022

Molecular resources

Consumer resources

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