Evidence for two schizophrenia susceptibility genes on chromosome 22q13.
OBJECTIVE
Previous linkage scans and meta-analyses for schizophrenia susceptibility loci failed to include the most distal portion of chromosome 22q. Accordingly, 27 families having individuals affected with schizophrenia and schizophrenia-spectrum disorders were analyzed using a set of highly informative markers covering all of chromosome 22q.


METHODS
Microsatellite and single nucleotide polymorphism markers were evaluated by nonparametric linkage, parametric linkage, and transmission disequilibrium testing of 22q.


RESULTS
The maximum nonparametric logarithm of odd scores were 2.9 (P=0.0016) for schizophrenia and 2.7 (P=0.003) for a broader disease definition that included schizotypal personality disorder-both at 44.5 cM within the Sult4A1 locus. Parametric models assuming dominant modes of inheritance and genetic heterogeneity gave maximum multipoint logarithm of odd scores for the broader disease definition at the Sult4A1 locus of 3.3 (P=0.0006) and single point logarithm of odd scores of 3.1-4.8 for Sult4A1 markers (P=0.000015-0.0005). A distal locus, centered at 61 cM, shows a maximum nonparametric logarithm of odd scores of 1.5 (P=0.072) for the broader disease definition. Transmission disequilibrium testing for three adjacent microsatellite markers located near the distal linkage peak revealed significant values for marker D22s526 for schizophrenia (P=0.0016-0.14) and for broader disease definitions including schizotypal personality disorder (P=0.0002-0.0003), and both schizotypal personality disorder plus schizoaffective disorder (P=0.00001-0.000077).


CONCLUSIONS
At least two separable, but closely linked, loci within 22q13 influencing susceptibility to schizophrenia-spectrum disorders, might be possible.
Condra
Jodi A
JA
Department of Biochemistry and Molecular Biology, Center for Genetics and Molecular Medicine, University of Louisville School of Medicine, Louisville, KY 40292, USA.
Neibergs
Holly
H
Wei
Wei
W
Brennan
Mark D
MD
D044383:Black People / Q000235:genetics; D002874:Chromosome Mapping; D002892:Chromosomes, Human, Pair 22; D003718:Denmark; D005190:Family; D005260:Female; D005819:Genetic Markers; D020022:Genetic Predisposition to Disease; D006801:Humans; D008297:Male; D011618:Psychotic Disorders / Q000235:genetics*; D012559:Schizophrenia / Q000235:genetics*; D035781:Siblings; D044465:White People / Q000235:genetics
D005819:Genetic Markers