Summary
Computational reconstruction of long chromosome sequences from many short reads.
In depth
Short reads are assembled by de Bruijn graphs; long reads by overlap-layout-consensus. Hi-C scaffolds to chromosomes. Metrics include N50 and completeness (BUSCO). Repeats are the main difficulty.
Assembly quality is judged by contiguity, completeness and accuracy. Polishing improves base accuracy. Pangenome graphs represent diversity.
Common mistake: reference genomes are not 'the' human genome; they are a representation of one or a few people.
Frequently asked questions
What is Genome Assembly?
Computational reconstruction of long chromosome sequences from many short reads.
Which area of biology covers Genome Assembly, and how advanced is it?
Genome Assembly is one of the 56 topics in Biotechnology & Genomics. It is rated Advanced, so it suits learners who want specialist depth. Related topics in this area include Long-Read Sequencing, Genomics, Bioinformatics.
Can you give an example of Genome Assembly?
The 2022 T2T-CHM13 assembly added about 200 Mb of new sequence.
What should I learn before Genome Assembly?
Work through the Beginner topics in Biotechnology & Genomics first, such as Biotechnology, Genetic Engineering, Selective Breeding, then return to Genome Assembly. Advanced topics assume the Intermediate vocabulary.
What topics are related to Genome Assembly?
The closest topics to Genome Assembly are Long-Read Sequencing, Genomics, Bioinformatics, DNA Sequencing. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Genome Assembly?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Genome Assembly. To practise the whole of Biotechnology & Genomics, use the Biotechnology & Genomics quiz.
How is Genome Assembly different from Long-Read Sequencing?
Genome Assembly: Computational reconstruction of long chromosome sequences from many short reads. Long-Read Sequencing: Nanopore and PacBio technologies read tens of thousands of bases at once, resolving repeats and structural variants. Read both side by side and note what each one explains.
What is a common mistake about Genome Assembly?
Reference genomes are not 'the' human genome; they are a representation of one or a few people.
How should I study Genome Assembly step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Long-Read Sequencing and explain the difference aloud. Finally, take the Biotechnology & Genomics quiz and come back to this page for any question you miss.