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Quantitative and antigenic differences in complement component C4 between American blacks and whites.

J M Moulds1, N B Warner, F C Arnett

  • 1Division of Rheumatology and Clinical Immunogenetics, University of Texas Health Science Center, Houston.

Complement and Inflammation
|January 1, 1991
PubMed
Summary
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Black Americans have higher total complement component 4 (C4) levels, primarily due to increased C4B, compared to Caucasians. C4 allotyping is recommended for accurate C4A and C4B quantification in Black populations.

Area of Science:

  • Immunogenetics
  • Human Complement System

Background:

  • Complement component 4 (C4) plays a crucial role in immune responses.
  • Normal ranges for C4, C4A, and C4B levels are essential for clinical diagnostics.
  • Existing data on C4 levels primarily reflects Caucasian populations.

Purpose of the Study:

  • To establish normal ranges for total C4, C4A, and C4B in healthy Black Americans.
  • To compare C4 levels in Black Americans with those in Caucasian populations.
  • To investigate the specific contributions of C4A and C4B to total C4 differences.

Main Methods:

  • Enzyme-linked immunoassay (EIA) was used to quantify C4 levels.
  • A cohort of 98 healthy Black Americans was studied.
  • Statistical analysis (p-values) was employed to determine significance.

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Main Results:

  • Mean total C4 levels in Black Americans (44 +/- 12.8 mg/dl) were significantly higher than in Caucasians (31.7 +/- 11.5 mg/dl; p < 0.001).
  • Increased C4B levels (mean = 24.4 mg/dl) in Black Americans accounted for the difference in total C4 compared to Caucasians (mean = 15.7 mg/dl; p < 0.001).
  • These differences persisted even after excluding samples with the C4A 91 phenotype.

Conclusions:

  • Significant ethnic variations exist in complement component 4 levels, particularly C4B.
  • Enzyme-linked immunoassays may require careful interpretation for C4A and C4B in Black populations.
  • C4 allotyping is recommended for accurate C4A and C4B quantitation in Black Americans due to potential EIA limitations.