Definition

1. Noun:
   • X-linked severe combined immunodeficiency: A specific, inherited form of Severe Combined Immunodeficiency (SCID) that primarily affects male children. It results from a mutation in a gene located on the X chromosome. This gene normally codes for a protein essential for the proper development and function of T cells and other immune cells.

Usage Examples

• Noun:
  • The infant was diagnosed with X-linked SCID, requiring immediate isolation and treatment.
  • Early detection of X-linked SCID through newborn screening can be life-saving.
  • The research focuses on gene therapy for X-linked SCID.

Advanced Usage

• Medical Context: The term is used almost exclusively in clinical, genetic, and research contexts to specify this particular genetic etiology of SCID.
  • The study compared outcomes for patients with X-linked SCID versus other forms of the disorder.

Variants and Related Words

• SCID (noun): Severe Combined Immunodeficiency, the broader category of disorders.
• X-SCID (noun): A common abbreviated form for X-linked SCID.
• ADA-SCID (noun): Another form of SCID caused by adenosine deaminase deficiency, often contrasted with X-linked SCID.

Synonyms

• X-linked severe combined immunodeficiency (noun): The full medical term.
• X-SCID (noun): The standard abbreviation.

Notes on Meaning

This term refers specifically to a medical condition with a known genetic cause (an X-linked mutation). It is not a general term for immune deficiency but names a precise diagnosis. The definition highlights the mechanism: the mutated gene prevents T cells from developing a functional receptor for a crucial growth factor.

Noun

1. SCID in male children resulting from mutation of a gene that codes for a protein on the surface of T cells that allows them to develop a growth factor receptor