title: C4A deficiency due to a 2 bp insertion is increased in patients with systemic lupus erythematosus.
abstract: OBJECTIVE
  The association of C4A deficiency with systemic lupus erythematosus (SLE) is well documented. In Caucasian populations, the most common cause of C4A deficiency is a large gene deletion in linkage disequilibrium with a conserved MHC haplotype. Because of this linkage disequilibrium, it has been difficult to determine which of the genes constitutes the disease susceptibility allele. Evidence from non-caucasoid populations has supported a role for C4A deficiency in SLE. We investigated whether a specific genetic cause of C4A deficiency, not associated with A1, B8, DR3, is found with increased frequency in SLE compared to controls.
  
  
  METHODS
  Polymerase chain reaction was used to identify carriers of a 2 base pair (bp) insertion in exon 29. In total, 188 patients with SLE from the Johns Hopkins lupus cohort and 222 controls were genotyped.
  
  
  RESULTS
  The 2 bp insertion was found more frequently in patients with SLE compared to controls and was more common in Caucasian than in African American SLE patients. There were no clinical differences between patients that carried the mutation and those that did not.
  
  
  CONCLUSIONS
  The association of this C4A null allele with SLE supports a role for C4A deficiency independent of other MHC associations in the etiopathogenesis of SLE.
authors.affiliation: Department of Pediatrics, Children's Hospital of Philadelphia, University of Pennsylvania School of Medicine, 19104, USA.
authors.forename: K E
authors.initials: KE
authors.lastname: Sullivan
authors.forename: N A
authors.initials: NA
authors.lastname: Kim
authors.forename: D
authors.initials: D
authors.lastname: Goldman
authors.forename: M A
authors.initials: MA
authors.lastname: Petri
mesh_terms: D044383:Black People / Q000235:genetics; D015331:Cohort Studies; D015934:Complement C4a / Q000172:deficiency* / Q000235:genetics / Q000378:metabolism; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D006801:Humans; D008180:Lupus Erythematosus, Systemic / Q000208:ethnology / Q000235:genetics* / Q000378:metabolism; D008285:Major Histocompatibility Complex / Q000235:genetics; D016254:Mutagenesis, Insertional; D044465:White People / Q000235:genetics; D001741:Black or African American
chemical_list: D015934:Complement C4a