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Adenosine deaminase deficiency with normal immune function. An acidic enzyme mutation.

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    A rare adenosine deaminase deficiency in a child did not cause immunodeficiency. This suggests residual enzyme activity in other tissues may protect immune function despite low levels in lymphocytes.

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    Area of Science:

    • Biochemistry
    • Immunology
    • Genetics

    Background:

    • Adenosine deaminase (ADA) deficiency typically causes severe combined immunodeficiency (SCID).
    • Purine metabolism is crucial for immune cell function.

    Observation:

    • A male child with markedly deficient erythrocyte and lymphocyte ADA activity presented with normal immune function.
    • Enzyme activity and protein were undetectable in erythrocytes, but present at low levels in lymphocytes, lymphoblasts, and fibroblasts.
    • Plasma adenosine and deoxyadenosine levels were undetectable, with only slight deoxy ATP elevation in blood cells.

    Findings:

    • The patient's lymphoblasts showed no defect in deoxyadenosine metabolism.
    • ADA enzyme kinetics, stability, and molecular weight were normal, but isoelectric pH was abnormal.
    • A unique acidic, heat-stable ADA protein mutation was identified, with <1% lymphocyte ADA activity.

    Implications:

    • This case challenges the typical understanding of ADA deficiency and SCID.
    • Residual ADA activity in non-lymphoid tissues may be sufficient to maintain immune function.
    • Further research into tissue-specific enzyme activity is warranted for understanding immunodeficiency.