Lesson plan
Consensus sequence
In molecular biology and bioinformatics, the consensus sequence (or canonical sequence) is the calculated sequence of most frequent residues, either nucleotide or amino acid, found at each position in a sequence alignment. It represents the results of multiple sequence alignments in which related sequences are compared to each other and similar sequence motifs are calculated. Such information is important when considering sequence-dependent enzymes such as RNA polymerase. To address the limitations of consensus sequences—which reduce variability to a single residue per position—sequence logos provide a richer visual representation of aligned sequences. Logos display each position as a stack of letters (nucleotides or amino acids), where the height of a letter corresponds to its frequency in the alignment, and the total stack height reflects the information content (measured in bits). The most frequent residue appears at the top of the stack, preserving the consensus while also revealing subtle patterns, such as functionally important but less frequent residues (e.g., alternative start codons or transcription factor binding sites).
Article summary
In molecular biology and bioinformatics, the consensus sequence (or canonical sequence) is the calculated sequence of most frequent residues, either nucleotide or amino acid, found at each position in a sequence alignment. It represents the results of multiple sequence alignments in which related sequences are compared to each other and similar sequence motifs are calculated. Such information is important when considering sequence-dependent enzymes such as RNA polymerase. To address the limitations of consensus sequences—which reduce variability to a single residue per position—sequence logos provide a richer visual representation of aligned sequences. Logos display each position as a stack of letters (nucleotides or amino acids), where the height of a letter corresponds to its frequency in the alignment, and the total stack height reflects the information content (measured in bits). The most frequent residue appears at the top of the stack, preserving the consensus while also revealing subtle patterns, such as functionally important but less frequent residues (e.g., alternative start codons or transcription factor binding sites).
Key claims
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Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
Bibliography
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Key claims and bibliography are generated from the same tracked claims and sources as the article page.