Extended Data Figure 5: Detailed analysis of the association of schizophrenia to genetic variation at and around C4, in data from 28,799 schizophrenia cases and 35,986 controls.
From: Schizophrenia risk from complex variation of complement component 4
(Psychiatric Genomics Consortium, ref. 6.) SCZ, schizophrenia; β, estimated effect size per copy of the genomic feature or allele indicated; SE, standard error. Detailed association analyses of HLA alleles are in Extended Data Figs 6 and 7. The single asterisk (*) indicates that we specifically tested C4B-null status because a 1985 study52 reported an analysis of 165 schizophrenia patients and 330 controls in which rare C4B-null status associated with elevated risk of schizophrenia, though two subsequent studies53,54 found no association of schizophrenia to C4B-null genotype. We sought to evaluate this using the large data set in this study, finding no association to C4B-null status. The double asterisk (**) indicates total copy number of C4 is also strongly correlated to copy number of the CYP21A2P pseudogene, which is present on duplicated copies of the sequence shown in Extended Data Fig. 1g.
