Failure of thymic development: DiGeorge syndrome
Failure of expressiorn of HLA molecules: L Barę lympbocyte syndromes
Lymphoid progenitors
s
Failure of lymphocyte precursors:
Severe combined immune deficiency
• Thymus
Proliferation and maturation of thymocytes
Export of maturę T lymphocytes to periphery
Stern
cells
Bonę
marrow
Failure of normal cytokine production: Cytokine deficiencies
Failure of normal apoptosis: Autoimmune lymphoproliferative syndromes
T-lymphocyte activation and effector function
Apoptotic celi death
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