Sniper

Sniper identifies single nucleotide polymorphisms (SNPs) from next-generation sequencing data by explicitly modeling multi-mapping reads with a multi-locus Bayesian probabilistic approach to improve SNP discovery in repetitive and paralogous regions of eukaryotic genomes.

Key Features:

• Multi-locus Bayesian model: Implements a multi-locus Bayesian probabilistic model to represent allele configurations across multiple genomic loci.
• Multi-mapping read handling: Explicitly incorporates and analyzes reads that map to multiple genomic locations rather than discarding them.
• Computational efficiency: Uses a computationally efficient algorithm specifically tailored to handle sequence reads mapping to multiple loci.
• Error modeling: Accounts for sequencing errors when estimating variant probabilities.
• Template bias correction: Models template bias to reduce false-positive variant calls arising from amplification or library biases.
• Multi-locus SNP combination modeling: Represents and evaluates combinations of SNPs across loci to improve accuracy in repetitive regions.
• Sensitivity and specificity considerations: Designed to maintain high sensitivity and specificity across a range of conditions encountered in complex genomes.

Scientific Applications:

• Population genomics: Detection and characterization of genetic variation within and between populations using NGS data.
• Disease-association studies: Identification of SNPs for downstream association analyses linking variants to phenotypes or diseases.
• Evolutionary biology: Analysis of genomic diversity and evolutionary patterns in organisms with repetitive or paralogous genomes.
• SNP discovery in complex genomes: Improved SNP identification in eukaryotic genomes containing interspersed repetitive elements and paralogous genes.

Methodology:

Applies a multi-locus Bayesian probabilistic model with a computationally efficient algorithm to explicitly incorporate and analyze multi-mapping reads while accounting for sequencing errors, template bias, and multi-locus SNP combinations.