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A linkage study of schizophrenia to markers within Xp11 near the MAOB gene
Journal article   Peer reviewed

A linkage study of schizophrenia to markers within Xp11 near the MAOB gene

Janine Dann, Lynn E DeLisi, Marcella Devoto, Steven Laval, Derek J Nancarrow, Gail Shields, Angela Smith, Josephine Loftus, Paula Peterson, Antonio Vita, …
Psychiatry research, v 70(3), pp 131-143
1997
PMID: 9211575

Abstract

ALAS2 ARAF1 DXS228 DXS7 Schizoaffective disorder Sib-pair analysis
A sex chromosome locus for psychosis has been considered on the basis of some sex differences in genetic risk and expression of illness, and an association with X-chromosome anomalies. Previous molecular genetic studies produced weak evidence for linkage of schizophrenia to the proximal short arm of the X-chromosome, while some other regions were not ruled out. Here we report an attempt to expand the Xp findings in: (i) a multicenter collaboration focusing on 92 families with a maternal pattern of inheritance (Study I.); and (ii) an independent sample of 34 families unselected for parental mode of transmission (Study II.). In the multicenter study, a parametric analysis resulted in positive lod scores (highest of 1.97 for dominant and 1.19 for recessive inheritance at a theta of 0.20) for locus DXS7, with scores below 0.50 for other markers in this region ( MAOB, DXS228, and ARAF1). Significant allele sharing among affected sibling pairs was present at DXS7. In the second study, positive lod scores were observed at MAOB (highest of 2.16 at a theta of 0.05 for dominant and 1.64 at a theta of 0.00 for recessive models) and ALAS2 (the highest of 1.36 at a theta of 0.05 for a recessive model), with significant allele sharing ( P=0.003 and 0.01, respectively) at these two loci. These five markers are mapped within a small region of Xp11. Thus, although substantial regions of the X-chromosome have been investigated without evidence for linkage being found, a locus predisposing to schizophrenia in the proximal short arm of the X-chromosome is not excluded. © 1997 Elsevier Science Ireland Ltd.

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