%\VignetteIndexEntry{focalCall}
%\VignetteDepends{CGHcall}
%\VignetteKeywords{Calling aberrations for array CGH tumor profiles.}
%\VignettePackage{focalCall}

\documentclass[11pt]{article}

\usepackage{amsmath}
\usepackage[authoryear,round]{natbib}
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\SweaveOpts{echo=FALSE}

\begin{document}
\SweaveOpts{concordance=TRUE}

\setkeys{Gin}{width=0.99\textwidth}

\title{\bf FocalCall: An R package for the annotation of focal copy number aberrations.}

\author{Oscar Krijgsman}

\maketitle

\begin{center}
Department of Pathology
VU University Medical Center
the Netherlands
Current adres:
Department of Molecular Oncology
Netherlands Cancer Institute 
the Netherlands
\end{center}

\begin{center}

{\tt oscarkrijgsman@gmail.com}
{\tt o.krijgsman@nki.nl}

\end{center}


\tableofcontents

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\section{Overview}

To identify somatic focal copy number aberrations (CNAs) in cancer specimens and 
distinguish them from germ-line copy number variations (CNVs) we developed a software 
package named, focalCall. focalCall permits user-defined size cut-offs to recognize focal aberrations and builds on established array CGH segmentation and calling algorithms. 
To differentiate CNAs from CNVs the algorithm can either make use of a matched normal 
reference signal or, if this is not available, an external CNV track. focalCall
furthermore differentiates between homozygous and hemizygous deletions as well as gains 
and amplifications and is applicable to high-resolution array and sequencing data. 

\section{Example}

In this section we will use focalCall to analyse the dataset previously published by 
\citep{Bierkens} Bierkens et al. (2013) and preprocessed using \citep{CGHcall} by Wiel et al. (2007). The example set used here only contains complete chromosome 2. 
For the other chromosomes only a small portion of the CGH probes are included. The 
complete dataset can be downloaded from the NCBI Gene Expression Omnibus (GEO), 
accession number GSE34575.
First, we load the required packages and the data:

<<echo=TRUE,print=FALSE>>=
library(focalCall)
data(BierkensCNA)
@

\noindent
Next, we apply the {\tt focalCall} function which:
\begin{itemize}
\item detects all aberrations smaller than {\tt focalSize} in Mb in the tumor data (CGHset)
\item calculates peak regions for each genomic region where recurrent focal CNAs are detected
\item compare each peak region to known copy number variants (CNVset)
\item returns calls object with calls for focal CNA included
\item report all focal CNAs as figures and tables
\end{itemize}

<<echo=TRUE,print=FALSE>>=
calls_focals<-focalCall(CGHset, CNVset, focalSize = 3, minFreq=2)
@


\noindent
A frequency plot of all aberrations and all focal aberrations can be generated using {\tt FreqPlot} and {\tt FreqPlotfocal}.

\begin{center}
<<fig=TRUE,echo=TRUE>>=
FreqPlot(calls_focals, header="FrequencyPlot all aberrations")
@
\end{center}


\begin{center}
<<fig=TRUE,echo=TRUE>>=
FreqPlotfocal(calls_focals, header="FrequencyPlot all aberrations")
@
\end{center}
@

\pagebreak
\noindent
Alternatively, we can generate files for visualisation in IGV with {\tt igvFiles}. The files will be written to the home directory and can be loaded in IGV directly. 

\begin{center}
<<echo=TRUE,print=FALSE>>=
igvFiles(calls_focals)
@
\end{center}


\pagebreak
%\newpage
\bibliographystyle{apalike}
\bibliography{focalCall}

\pagebreak

\section{Session Information}

The version number of R and packages loaded for generating the vignette were:
<<echo=TRUE,print=FALSE>>=
sessionInfo()
@

\end{document}