Confirmation of the association of the C4B null allelle in autism.
The objective of this study was to examine and attempt to confirm our previous findings of an increased frequency of the C4B null allele (C4BQ0) in subjects with autism. Newly identified subjects from Utah and Oregon were studied. Families evaluated included 85 who had a child with autism and 69 control families. Of the subjects with autism studied, 42.4% carried at least one C4BQ0, compared with 14.5% of the control subjects (p = 0.00013), with a relative risk of 4.33. Over half of the C4B null alleles in the subjects with autism involved C4A duplications. A marked increase in the ancestral haplotype 44.1 that lacks a C4B gene and has 2 C4A genes was also observed. The results of this study suggest that the human leukocyte antigen class III C4BQ0 significantly increases the risk for autism.
Odell
Dennis
D
Center for Persons with Disabilities, Utah State University, Logan, UT 84322, USA. dennis@cpd2.usu.edu
Maciulis
Alma
A
Cutler
Adele
A
Warren
Louise
L
McMahon
William M
WM
Coon
Hilary
H
Stubbs
Gene
G
Henley
Kathy
K
Torres
Anthony
A
D001321:Autistic Disorder / Q000235:genetics*; D015935:Complement C4b / Q000235:genetics*; D005787:Gene Frequency; D005838:Genotype; D006649:Histocompatibility Antigens / Q000235:genetics; D006801:Humans; D016133:Polymerase Chain Reaction
D006649:Histocompatibility Antigens; D015935:Complement C4b