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Genomics Data Processing

⬢ TIER 3Domains
High
Salary impact
3 months
Time to learn
Hard
Difficulty
5
Careers
At a glance

Genomics data processing handles raw DNA sequences from sequencers (illumina, long-read), performs quality control, alignment, variant calling, and interpretation. Tools: BWA, GATK, samtools, bcftools, nextflow. Senior genomics engineers earn $140-210k because the skill is rare, regulatory stakes are high, and data volume is massive (terabytes per patient). Mastery: 8-12 weeks.

What is Genomics Data Processing

Genomics data processing is the pipeline from raw DNA sequencer output (millions of short reads) to variant calls (mutations identified). Key steps: (1) quality control (discard low-quality reads), (2) alignment (map reads to reference genome using BWA), (3) realignment and base quality recalibration, (4) variant calling (GATK HaplotypeCaller), (5) annotation (interpret variants with databases like ClinVar, dbSNP). Output is a VCF (Variant Call Format) file listing all variants with quality scores. Downstream analysis identifies disease-causing mutations, performs population genetics, or screens for predisposition genes.

🔧 TOOLS & ECOSYSTEM
GATK (Genome Analysis Toolkit)BWA (Burrows-Wheeler Aligner)samtoolsbcftoolsbedtoolsNextflowSnakemakeDockerAWS S3VCF format tools

💰 Salary by region

RegionJuniorMidSenior
USA$85k$145k$220k
UK£52k£88k£135k
EU€58k€95k€145k
CANADAC$90kC$150kC$230k

❓ FAQ

What's the difference between whole genome sequencing (WGS) and whole exome sequencing (WES)?
WGS sequences the entire genome (~3 billion base pairs); WES sequences only coding regions (~1-2% of genome). WES is cheaper and faster but misses regulatory variants. WGS more comprehensive but more data to process.
How do I call variants from aligned reads?
Use GATK HaplotypeCaller (best for WGS/WES) or bcftools (faster, lighter). Both perform local realignment, base quality recalibration, and genotyping. GATK produces more accurate calls but requires more compute. Choice depends on sample count and turnaround time.
What's the gold standard for variant validation?
Orthogonal confirmation: PCR + Sanger sequencing (expensive, slow). ddPCR (digital PCR). For research, dbSNP and ClinVar cross-reference. For clinical, regulatory compliance (CLIA, CAP) requires validated pipelines.
How do I handle large-scale genomics data (1000s of samples)?
Use workflow managers (Nextflow, Snakemake) for parallelization. Batch samples in cohorts. Use cloud storage (AWS S3, GCS). Implement checkpoint recovery (resume failed tasks). Monitor costs closely.
What's the computational cost of variant calling for 1000 samples?
Rule of thumb: 1-2 core-hours per sample. 1000 samples = 1000-2000 core-hours = ~$5-20k on AWS Spot Instances. WGS is 10x more expensive than WES.

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