Trimmomatic

Trimmomatic performs quality-based trimming and adapter removal on Illumina sequencing reads to improve data quality prior to downstream NGS analyses.

Key Features:

• Quality Control: Performs quality checks on raw FastQ files to identify and remove low-quality bases and contaminants.
• Read Trimming: Removes leading and trailing low-quality bases and supports sliding-window-based trimming to excise low-quality regions.
• Adapter Removal: Detects and removes adapter sequences from reads to prevent alignment and analysis artifacts.
• Customizable Filters: Applies a series of user-specified trimming parameters and customizable filters for preprocessing.

Scientific Applications:

• RNA-Seq / Transcriptomics: Preprocesses Illumina RNA-Seq data to retain high-quality reads for differential gene expression and other transcriptomic analyses.
• Alignment and Quantification Preparation: Improves accuracy of read alignment and transcript quantification by removing adapters and low-quality sequence.

Methodology:

Operates on raw sequencing data in FastQ format, applying customizable filters that include removal of leading and trailing low-quality bases, sliding-window trimming, and adapter sequence identification and removal.