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Old 04-20-2012, 03:40 AM   #1
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Default ChIP-Seq: TSSi - An R package for transcription start site identification from 5' mRN

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TSSi - An R package for transcription start site identification from 5' mRNA tag data.

Bioinformatics. 2012 Apr 17;

Authors: Kreutz C, Gehring JS, Lang D, Reski R, Timmer J, Rensing SA

Abstract
SUMMARY: High throughput sequencing has become an essential experimental approach for the investigation of transcriptional mechanisms. For some applications like ChIP-seq, several approaches for the prediction of peak locations exist. However, these methods are not designed for the identification of transcription start sites (TSSs) because such data sets contain qualitatively different noise.In this application note, the R package TSSi is presented which provides a heuristic framework for the identification of TSSs based on 5' mRNA tag data. Probabilistic assumptions for the distribution of the data, i.e. for the observed positions of the mapped reads, as well as for systematic errors, i.e. for reads which map closely but not exactly to a real TSS, are made and can be adapted by the user. The framework also comprises a regularization procedure which can be applied as a preprocessing step to decrease the noise and thereby reduce the number of false predictions. AVAILABILITY: The R package TSSi is available from the Bioconductor web site: http://www.bioconductor.org/packages...html/TSSi.html CONTACT: ckreutz@fdm.uni-freiburg.deSupplementary information is provided online.


PMID: 22513994 [PubMed - as supplied by publisher]



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