Bioinformatics Guides & Tutorials

Plain-English guides to DNA, RNA and protein analysis: reverse complement, GC content, primer design, ORFs, codon optimization, restriction digests and FASTQ quality.

• Reverse Complement of DNA, Explained (With Examples)

  What a reverse complement is, how to compute it by hand, why it matters for primers and the antisense strand, plus worked DNA and RNA examples.

  5 min read

• How to Calculate GC Content of DNA (and Why It Matters)

  Learn how GC content is calculated, what a normal GC% is, and how it affects primer Tm, PCR conditions and sequence stability — with a worked example.

  5 min read

• Primer Design Basics: Melting Temperature (Tm) and GC Content

  A practical guide to designing PCR primers: target length, GC content, melting temperature formulas (Wallace and salt-adjusted), and matching primer pairs.

  6 min read

• Reading Frames and Open Reading Frames (ORFs), Explained

  Understand the six reading frames, what an open reading frame is, start and stop codons, and how to find the ORF that encodes your protein.

  6 min read

• Codon Optimization Explained: How It Works and When to Use It

  What codon optimization is, how codon usage bias affects protein expression, the trade-offs to watch for, and how to optimise a gene for E. coli, human or yeast.

  6 min read

• Restriction Enzymes and How to Plan a Digest

  How restriction enzymes recognise and cut DNA, the difference between sticky and blunt ends, and how to plan a single or double digest for cloning.

  6 min read

• Understanding FASTQ Format, Phred Quality Scores and N50

  A plain-English guide to the FASTQ format, how Phred quality scores and their ASCII encoding work, and what the N50 statistic tells you about an assembly.

  6 min read