PhenoChipping of psychotic disorders

A novel approach for deconstructing and quantitating psychiatric phenotypes

Alexander Niculescu, Len L. Lulow, Corey A. Ogden, Helen Le-Niculescu, Daniel R. Salomon, Nicholas J. Schork, Michael P. Caligiuri, James B. Lohr

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Psychiatric phenotypes as currently defined are primarily the result of clinical consensus criteria rather than empirical research. We propose, and present initial proof of principle for, a novel approach to characterizing psychiatric phenotypes. We have termed our approach PhenoChipping, by analogy with, and borrowing paradigms and tools from, gene expression microarray studies (GeneChipping). A massive parallel profiling of cognitive and affective state is done with a PhenoChip composed of a battery of existing and new quantitative psychiatric rating scales, as well as hand neuromotor measures. We present preliminary data from 104 subjects, 72 with psychotic disorders (bipolar disorder-41, schizophrenia-17, schizoaffective disorder-14), and 32 normal controls. Microarray data analysis software and visualization tools were used to investigate: 1. relationships between phenotypic items ("phenes"), including with objective motor measures, and 2. relationships between subjects. Our analyses revealed phenotypic overlap among, as well as phenotypic heterogeneity within, the three major psychotic disorders studied. This approach may be useful in helping us move beyond current diagnostic classifications, and suggests a combinatorial building-block (Lego-like) structure underlies psychiatric syndromes. The adaptation of microarray informatic tools for phenotypic analysis readily facilitates direct integration with gene expression profiling of lymphocytes in the same individuals, a strategy for molecular biomarker identification. Empirically derived clusterings of (endo)phenotypes and of patients will better serve genetic, pharmacological, and imaging research, as well as clinical practice.

Original languageEnglish
Pages (from-to)653-662
Number of pages10
JournalAmerican Journal of Medical Genetics, Part B: Neuropsychiatric Genetics
Volume141
Issue number6
DOIs
StatePublished - Sep 5 2006

Fingerprint

Psychotic Disorders
Psychiatry
Phenotype
Informatics
Empirical Research
Gene Expression Profiling
Microarray Analysis
Bipolar Disorder
Cluster Analysis
Schizophrenia
Consensus
Software
Hand
Biomarkers
Pharmacology
Lymphocytes
Gene Expression
Research

Keywords

  • Biomarkers
  • Bipolar
  • Endophenotypes
  • Microarrays
  • Psychiatric profiling
  • Schizophrenia

ASJC Scopus subject areas

  • Genetics(clinical)
  • Neuropsychology and Physiological Psychology
  • Neuroscience(all)

Cite this

PhenoChipping of psychotic disorders : A novel approach for deconstructing and quantitating psychiatric phenotypes. / Niculescu, Alexander; Lulow, Len L.; Ogden, Corey A.; Le-Niculescu, Helen; Salomon, Daniel R.; Schork, Nicholas J.; Caligiuri, Michael P.; Lohr, James B.

In: American Journal of Medical Genetics, Part B: Neuropsychiatric Genetics, Vol. 141, No. 6, 05.09.2006, p. 653-662.

Research output: Contribution to journalArticle

Niculescu, Alexander ; Lulow, Len L. ; Ogden, Corey A. ; Le-Niculescu, Helen ; Salomon, Daniel R. ; Schork, Nicholas J. ; Caligiuri, Michael P. ; Lohr, James B. / PhenoChipping of psychotic disorders : A novel approach for deconstructing and quantitating psychiatric phenotypes. In: American Journal of Medical Genetics, Part B: Neuropsychiatric Genetics. 2006 ; Vol. 141, No. 6. pp. 653-662.
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