Encyclopedia > Chromosome walking

  Article Content

Chromosome walking

Method in genetics for identifying and sequencing long parts of a DNA strand, e.g., a chromosome. As long DNA strands cannot be sequenced, this method works by dividing the long sequence into several short ones. Basically, chromosome walking works as follows:
  1. A primer that matches the beginning of the DNA to sequence is used to synthesize a short DNA strand complementray to the unknown sequence, starting with the primer (see PCR).
  2. The new short DNA strand is sequenced.
  3. The end of the sequenced strand is used as a primer for the next part of the long DNA sequence.
That way, the short part of the long DNA that is sequenced keeps "walking" along the sequence. The method can be used to sequence entire chromosomes (thus, chromosome walking). A different method with the same purpose which becomes more popular for large-scale sequencing (e.g., the Human Genome Project) is shotgun sequencing.



All Wikipedia text is available under the terms of the GNU Free Documentation License

 
  Search Encyclopedia

Search over one million articles, find something about almost anything!
 
 
  
  Featured Article
Malaria

... to eradicate malaria by attacking mosquitos have been successful in some areas. Malaria was once common in the United States and southern Europe, but the draining of ...