title: Assessing the validity of blood-based gene expression profiles for the classification of schizophrenia and bipolar disorder: a preliminary report.
abstract: Recent advances have facilitated the use of blood-derived RNA to conduct genomic analyses of human diseases. This emerging technology represents a rigorous and convenient alternative to traditional tissue biopsy-derived RNA, as it allows for larger sample sizes, better standardization of technical procedures, and the ability to non-invasively profile human subjects. In the present pilot study, we have collected RNA from blood of patients diagnosed with schizophrenia or bipolar disorder (BPD), as well as normal control subjects. Using microarray analysis, we found that each disease state exhibited a unique expressed genome signature, allowing us to discriminate between the schizophrenia, BPD, and control groups. In addition, we validated changes in several potential biomarker genes for schizophrenia and BPD by RT-PCR, and some of these were found to code to chromosomal loci previously linked to schizophrenia. Linear and non-linear combinations of eight putative biomarker genes (APOBEC3B, ADSS, ATM, CLC, CTBP1, DATF1, CXCL1, and S100A9) were able to discriminate between schizophrenia, BPD, and control samples, with an overall accuracy of 95%-97% as indicated by receiver operating characteristic (ROC) curve analysis. We therefore propose that blood cell-derived RNA may have significant value for performing diagnostic functions and identifying disease biomarkers in schizophrenia and BPD.
authors.affiliation: Department of Psychiatry, Institute of Behavioral Genomics, University of California, San Diego, La Jolla, California 92093-0603, USA. mtsuang@ucsd.edu
authors.forename: Ming T
authors.initials: MT
authors.lastname: Tsuang
authors.forename: Nadine
authors.initials: N
authors.lastname: Nossova
authors.forename: Tom
authors.initials: T
authors.lastname: Yager
authors.forename: Min-Min
authors.initials: MM
authors.lastname: Tsuang
authors.forename: Shi-Chin
authors.initials: SC
authors.lastname: Guo
authors.forename: Kou Ge
authors.initials: KG
authors.lastname: Shyu
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: Glatt
authors.forename: C C
authors.initials: CC
authors.lastname: Liew
mesh_terms: D001714:Bipolar Disorder / Q000097:blood / Q000145:classification / Q000235:genetics*; D016000:Cluster Analysis; D018076:DNA, Complementary / Q000235:genetics; D020869:Gene Expression Profiling / Q000379:methods*; D016015:Logistic Models; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods; D012313:RNA / Q000097:blood / Q000235:genetics / Q000302:isolation & purification; D015203:Reproducibility of Results; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012559:Schizophrenia / Q000097:blood / Q000145:classification / Q000235:genetics*
chemical_list: D018076:DNA, Complementary; D012313:RNA