Functional analysis of polymorphisms in the promoter regions of genes on 22q11

Human Mutation
Bastiaan HoogendoornPaul R Buckland

Abstract

Segmental aneusomy, which includes chromosome 22 deletion syndrome (del(22)(q11.2q11.2)), has been associated with DiGeorge syndrome (DGS), velocardiofacial syndrome (VCFS), conotruncal anomaly face (CAF) syndrome, cat-eye syndrome (CES), der(22) syndrome, and duplication of the del(22)(q11.2q11.2) syndrome's typically deleted region. Adults with del(22)(q11.2q11.2) may develop psychiatric illnesses, including schizophrenia, schizoaffective disorder, and bipolar disorder, suggesting that lower gene dosage leads to a predisposition to these illnesses. In a bid to identify important regulatory polymorphisms (SNPs) that may emulate changes in gene dosage of the genes within the common deletion, we have analyzed the promoter region of 47 genes (44 of which encode a protein with known function) encoding proteins in and around 22q11 for sequence variants. A total of 33 of the promoters contained polymorphisms. Of those, 25 were cloned into a reporter gene vector, pGL3. The relative ability of each promoter haplotype to promote transcription of the luciferase gene was tested in each of two human cell lines (HEK293t and TE671), using a cotransfected CMV-SPAP plasmid as an internal control. Five genes (PRODH, DGCR14, GSTT2, SERPIND1, an...Continue Reading

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22q11 Deletion Syndrome

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