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\item Brief literature review:
\begin{itemize}
%\item The availability of whole genome and exome sequencing are enabling rapid advances in genomic research.
\item Rare genetic variants can play major roles in influencing complex traits. \cite{Pritchard_2001, Schork_2009}
\item The rare susceptibility variants identified through sequencing have potential to explain some of the 'missing heritability' of complex traits. \cite{Eichler_2010}.
\item However, standard methods to test for association with single genetic variants are underpowered for rare variants unless sample sizes are very large. \cite{Lee_2014}
\item Overview of 3 types of analysis methods (Besides single-variant approach)
\begin{itemize}
\item Pooled-variant methods
combine evaluate the
cumulative effects of multiple genetic variants in a genomic region. The score statistics from marginal models of the trait association
with individual variants are collapsed into a single test statistic, either by combining the information
across for multiple
variant sites within variants into a
gene. Pooling information in this way can enrich single genetic score or by evaluating the
association signal distribution of the pooled score statistics of individual variants. \cite{Lee_2014}
\item Joint-modeling methods identify the joint effect of multiple genetic variants simultaneously \cite{Cho_2010}. This may be a more powerful approach than pooling marginal associations across variants when trait-influencing variants are in low linkage disequilibrium.
\item Individuals carrying the same disease-predisposing variant are likely to inherit it from the same ancestor. Therefore, cases will tend to cluster together in the underlying genealogy. A method to detect clustering of the cases on the tree represents an alternative grouping method based on relatedness \cite{Burkett_2013}.
\end{itemize}