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Delayed presentation of severe combined immunodeficiency due to prolonged maternal T cell engraftment

Saleh Z Al-Muhsen1

  • 1Department of Pediatrics, King Khaled University Hospital, King Saud University, Riyadh, Saudi Arabia. almuhsen@ksu.edu.sa

Annals of Saudi Medicine
|April 30, 2010
PubMed

Insights

Maternal T cell engraftment can mask severe combined immunodeficiency (SCID), delaying diagnosis. This case highlights how persistent maternal cells can temporarily restore immune function in SCID patients.

Area of Science:

  • Immunology
  • Genetics

Background:

  • Severe combined immunodeficiency (SCID) is a group of rare genetic disorders.
  • SCID is characterized by profound defects in T-cell and often B-cell immunity.

Observation:

  • A 9-year-old boy presented with opportunistic infections (Pneumocystis jiroveci pneumonia, cytomegalovirus).
  • Immunological evaluation revealed a T- B+SCID phenotype.
  • Maternal T cell engraftment was identified as the masking factor.

Findings:

  • The patient's SCID was masked by persistent, functional maternal T cells.
  • Infections likely occurred after the exhaustion of maternally engrafted cells.
  • This case demonstrates a T- B+SCID with delayed presentation.

Implications:

  • Maternal T cell engraftment can lead to a delayed clinical presentation of SCID.
  • This phenomenon can complicate the diagnosis of primary immunodeficiencies.
  • Consider maternal engraftment in atypical SCID cases with partial immune function.

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