SXOligoSearch

SXOligoSearch aligns Illumina sequencing reads to reference databases such as RefSeq RNA and NCBI genome builds to support identification of genomic variation and analysis of oligonucleotide content in applications including ChIP-sequencing and targeted re-sequencing.

Key Features:

• Alignment against reference databases: Aligns Illumina reads (25–50 nucleotides) to RefSeq RNA and NCBI genome builds across multiple organisms.
• Incorporation of base-call quality scores: Integrates base-call quality scores into alignment scoring to prioritize reliable positions within reads.
• 3' end error modeling: Accounts for higher sequencing error rates at 3' ends of longer reads to improve mapping accuracy for targeted re-sequencing.
• Large-dataset oligonucleotide analysis: Handles oligonucleotide content analysis in large datasets such as ChIP-sequencing samples.

Scientific Applications:

• Genomic variation identification: Enables detection of single nucleotide polymorphisms (SNPs) and other genetic variants via accurate read alignment to reference genomes.
• ChIP-sequencing analysis: Supports analysis of oligonucleotide content in ChIP-sequencing datasets to study protein–DNA interactions.
• Targeted re-sequencing: Improves mapping accuracy in targeted re-sequencing projects by using quality scores and 3' end error information.

Methodology:

Incorporates base-call quality scores and models increased 3' end error rates when mapping Solexa/Illumina reads, with validation reported on re-sequenced human BAC regions.