Genome Assembly
Pitfalls
- k-mer size is critical: Too small (k=2) → ambiguous graph, can't resolve repeats. Too large → breaks at sequencing errors, poor connectivity. Practical: k=31–127 for Illumina; SPAdes uses multiple k simultaneously.
- Repeat content breaks assemblies: Repeats longer than the read length create irresolvable branches in the de Bruijn graph. Long reads (PacBio/ONT) are essential for repeat-rich genomes.
- Short reads cannot use OLC: O(n²) pairwise overla
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