NHGRI/NCBI Short-Read Archive: Data Retrieval Gabor T. Marth Boston College Biology Department NCBI/NHGRI Short-Read.

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Presentation transcript:

NHGRI/NCBI Short-Read Archive: Data Retrieval Gabor T. Marth Boston College Biology Department NCBI/NHGRI Short-Read Archive meeting Bethesda, MD, July 27, 2007

What level of raw data detail is required? images processed traces (color intensities) base sequence + quality values 3 rd party image analysis? 3 rd party base callers?

What metadata is needed for specific analyses? Alignment / Assembly: Attempted read length Potential sequence clipping (quality; vector, linker, primer, barcode) Reference genome sequence for re-sequencing applications (genome / transcriptome; whole genome, target region) General: Machine HW and read processing SW versions Organism Library construction details Genomic DNA, cDNA, bisulfite-treated DNA, etc.? Single-end or paired-end reads?

Metadata (cont’d) SNP discovery: Base quality values Source DNA (diploid genome / PCR vs. clonal; single individual vs. pooled) Sample phenotype / disease status (tumor / normal) Ethnicity? Most read attributes are shared within lane / run; very few individual read-specific attributes. Are read names needed? Structural variation detection: Fragment length range Mate-pair relationship Ploidy

Granularity – atomic units of retrieval single read a lane a run multiple lanes/runs from an individual

Data presentation – searching and browsing How will data users find relevant datasets?

Context-driven retrieval Concessions to serve reads that align to a specific region (e.g. gene) potentially from a number of different runs/lanes?

Retrieval mechanisms Web-based Programmatic (tied in with data views?)

Connection to assembly archive & data formats How to make the connection between reads in the read archive and the assembly archive? Application support for short-read data manipulation (data access libraries)?