Combined immunodeficiency

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Combined immunodeficiency due to CD3gamma deficiency

ORPHA:169082Disease

What it is

A rare autosomal recessive primary immunodeficiency characterized by partial T lymphopenia (in particular cytotoxic CD8+ cells) and decreased expression of the T cell receptor (TCR)/CD3 complex with impaired proliferative response to TCR-dependent stimuli, while the mature memory T cell pool is comparatively well preserved, and B cells, natural killer cells, and immunoglobulins are typically normal. The clinical phenotype is highly heterogeneous, ranging from asymptomatic to infancy-onset of severe recurrent infections, as well as occurrence of autoimmune disease or enteropathy.

Key facts

Age of onset
Infancy
Inheritance
Autosomal recessive
Classified as
Disease

Gene

CD3GDisease-causing germline mutation(s)

ICD-10 codes

D81.2filed under a broader ICD-10 category — shared with 11 other rare diseases

ICD-10 has no distinct code for most rare diseases, so many are filed under the nearest available one. A shared code identifies the group, not this disease — the ORPHAcode above is what identifies it.

Related health topics

Reached through the ICD-10 categories this disease is filed under, so these describe the broader group rather than this disease specifically.

Cross-references

MONDO 0014276OMIM 615607UMLS C4510864

Orphadata Science: Free access data from Orphanet. © INSERM 1999. Data version 2026-06-23. Available under CC BY 4.0. This is a reference, not medical advice.

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