Detection of deletions and copy number variations in DNA sequences

摘要

Methods and systems are provided for improved detection of a relatively large predefined deletion using short read exome sequencing. Short read exome sequences of continuous exomes segments of a genome may be obtained each having a length of base pairs that is less than or equal to a threshold value. A target sequence of a reference genome may be stored that has a predefined deletion of a reference sequence having a length of base pairs that is relatively larger than the threshold value, such that a segment positioned after the deletion is shifted to abut a segment positioned prior to the deletion. Instances of short read exome sequences may be detected that straddle both the segment positioned after the deletion and the segment positioned prior to the deletion, wherein both segments falling within the relatively shorter length of the short read exome sequences indicates that the deletion has occurred.