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Disease Profile

Corticosteroid-binding globulin deficiency

Prevalence estimates on Rare Medical Network websites are calculated based on data available from numerous sources, including US and European government statistics, the NIH, Orphanet, and published epidemiologic studies. Rare disease population data is recognized to be highly variable, and based on a wide variety of source data and methodologies, so the prevalence data on this site should be assumed to be estimated and cannot be considered to be absolutely correct.


US Estimated

Europe Estimated

Age of onset





Autosomal dominant A pathogenic variant in only one gene copy in each cell is sufficient to cause an autosomal dominant disease.


Autosomal recessive Pathogenic variants in both copies of each gene of the chromosome are needed to cause an autosomal recessive disease and observe the mutant phenotype.


dominant X-linked dominant inheritance, sometimes referred to as X-linked dominance, is a mode of genetic inheritance by which a dominant gene is carried on the X chromosome.


recessive Pathogenic variants in both copies of a gene on the X chromosome cause an X-linked recessive disorder.


Mitochondrial or multigenic Mitochondrial genetic disorders can be caused by changes (mutations) in either the mitochondrial DNA or nuclear DNA that lead to dysfunction of the mitochondria and inadequate production of energy.


Multigenic or multifactor Inheritance involving many factors, of which at least one is genetic but none is of overwhelming importance, as in the causation of a disease by multiple genetic and environmental factors.


Not applicable


Other names (AKA)

CBG deficiency; Transcortin deficiency


Congenital and Genetic Diseases; Endocrine Diseases


Corticosteroid-binding globulin deficiency is a genetic disorder characterized by extreme tiredness (fatigue), particularly after physical exertion, and low blood pressure (hypotension).[1][2] Corticosteroid-binding globulin (CBG) is a protein primarily produced in the liver that attaches to cortisol, a hormone with numerous functions, including maintaining blood sugar levels, protecting the body from stress, and suppressing inflammation. When cortisol is needed in the body, CBG delivers the cortisol where it is needed and releases it.[1][3]

Signs and symptoms of CBG deficiency vary. While some individuals may experience no symptoms, others are found to have a fatty liver and chronic pain. Some people with CBG deficiency also have chronic fatigue syndrome. CGB deficiency is caused by mutations in the SERPINA6 gene. The SERPINA6 gene is commonly also referred to as the CBG gene. Both autosomal dominant and autosomal recessive inheritance have been reported.[1][2] While there is still no cure, treatment options will depend on the type and severity of symptoms present and may involve several specialists.


This table lists symptoms that people with this disease may have. For most diseases, symptoms will vary from person to person. People with the same disease may not have all the symptoms listed. This information comes from a database called the Human Phenotype Ontology (HPO) . The HPO collects information on symptoms that have been described in medical resources. The HPO is updated regularly. Use the HPO ID to access more in-depth information about a symptom.

Medical Terms Other Names
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Percent of people who have these symptoms is not available through HPO
Abnormality of metabolism/homeostasis
Laboratory abnormality
Metabolism abnormality

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Autosomal dominant inheritance
Autosomal recessive inheritance

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Low blood pressure
Increased muscle fatiguability

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These resources provide more information about this condition or associated symptoms. The in-depth resources contain medical and scientific language that may be hard to understand. You may want to review these resources with a medical professional.

Where to Start

  • Genetics Home Reference (GHR) contains information on Corticosteroid-binding globulin deficiency. This website is maintained by the National Library of Medicine.

In-Depth Information

  • Online Mendelian Inheritance in Man (OMIM) is a catalog of human genes and genetic disorders. Each entry has a summary of related medical articles. It is meant for health care professionals and researchers. OMIM is maintained by Johns Hopkins University School of Medicine. 
  • Orphanet is a European reference portal for information on rare diseases and orphan drugs. Access to this database is free of charge.


  1. corticosteroid-binding globulin deficiency. Genetics Home Reference. March 2014; https://ghr.nlm.nih.gov/condition/corticosteroid-binding-globulin-deficiency.
  2. Cassandra L. Kniffin. corticosteroid-binding globulin deficiency. OMIM. 6/1/2011; https://www.omim.org/entry/611489.
  3. D. J. Torpy, J. T. Ho. Corticosteroid-binding Globulin Gene Polymorphisms: Clinical Implications and Links to Idiopathic Chronic Fatigue Disorders. Clinical Endocrinology. 2007; 67(2):161-167. https://www.medscape.com/viewarticle/562049.