Is the P300 wave an endophenotype for schizophrenia? A meta-analysis and a family study

Bramon, Elvira; McDonald, Colm; Croft, Rodney J.; Landau, Sabine; Filbey, Francesca; Gruzelier, John; Sham, Pak; Frangou, Sophia and Murray, Robin. 2005. Is the P300 wave an endophenotype for schizophrenia? A meta-analysis and a family study. NeuroImage, 27(4), pp. 960-968. ISSN 10538119 [Article]

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We assessed the usefulness of the P300 wave as endophenotype for schizophrenia by means of a meta-analysis of the literature as well as our own family study.

Meta-analysis: We conducted a systematic search for articles published between 1983 and 2003 that reported P300 measures in non-psychotic relatives of schizophrenic patients and in healthy controls. Meta-regression analyses were performed using a random effects procedure. The pooled standardized effect size (PSES) was calculated as the difference between the means of the two groups divided by the common standard deviation. Local study: We examined the P300 wave with a standard two-tone oddball paradigm in 30 patients with schizophrenia, 40 non-psychotic relatives, and 40 controls using linear mixed models.

Meta-analysis: We pooled 472 relatives and 513 controls. The P300 amplitude was significantly reduced in relatives (PSES = 0.61; 95% CI: 0.30 to 0.91; P < 0.001). The P300 latency was significantly delayed in relatives (PSES of −0.50; 95% CI: −0.88 to −0.13; P = 0.009]. Local study: The patients showed a trend for amplitude reductions (P = 0.06) and significant latency delays (P < 0.01). The relatives displayed normal amplitude but had significant latency delays (P = 0.01). The P300 amplitude and especially the P300 latency are promising alternative phenotypes for genetic research into schizophrenia.

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Date Deposited:

16 Mar 2011 09:34

Last Modified:

30 Jun 2017 15:27

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Yes, this version has been peer-reviewed.


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