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Istituto di scienza dell'alimentazione

Torna all'elenco Contributi in rivista anno 2007

Contributo in rivista

Tipo: Articolo in rivista

Titolo: A Bayesian approach to estimation and testing in time-course microarray experiments

Anno di pubblicazione: 2007

Formato: Elettronico

Autori: Angelini C.; De Canditiis D.; Mutarelli M.; Pensky M.

Affiliazioni autori: Istituto per le Applicazioni del Calcolo Laboratorio di Bioinformatica, Seconda Universita di Napoli University of Central Florida

Autori CNR:

  • CLAUDIA ANGELINI
  • DANIELA DE CANDITIIS

Lingua: inglese

Abstract: The objective of the present paper is to develop a truly functional Bayesian method specifically designed for time series microarray data. The method allows one to identify differentially expressed genes in a time-course microarray experiment, to rank them and to estimate their expression profiles. Each gene expression profile is modeled as an expansion over some orthonormal basis, where the coefficients and the number of basis functions are estimated from the data. The proposed procedure deals successfully with various technical difficulties that arise in typical microarray experiments such as a small number of observations, non-uniform sampling intervals and missing or replicated data. The procedure allows one to account for various types of errors and offers a good compromise between nonparametric techniques and techniques based on normality assumptions. In addition, all evaluations are performed using analytic expressions, so the entire procedure requires very small computational effort. The procedure is studied using both simulated and real data, and is compared with competitive recent approaches. Finally, the procedure is applied to a case study of a human breast cancer cell line stimulated with estrogen. We succeeded in finding new significant genes that were not marked in an earlier work on the same dataset.

Lingua abstract: inglese

Pagine totali: 32

Rivista:

Statistical applications in genetics and molecular biology Berkeley Electronic Press,
Paese di pubblicazione: Stati Uniti d'America
Lingua: inglese
ISSN: 1544-6115

Numero volume: 6

DOI: 10.2202/1544-6115.1299

Referee: Sė: Internazionale

Indicizzato da:

  • ISI Web of Science (WOS) [000249844800002]
  • PubMed [17910530]
  • MathSciNet (Mathematical Reviews on the web) [2349917]
  • Google Scholar [http://scholar.google.it/]
  • Scopus [2-s2.0-34548752486]

Parole chiave:

  • Time course microarray
  • testing
  • Bayes Factor

URL: http://www.degruyter.com/view/j/sagmb.2007.6.1/sagmb.2007.6.1.1299/sagmb.2007.6.1.1299.xml

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