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Restriction Enzymes: How is DNA Manipulated? Using restriction enzymes, foreign genes can be added to an existing organism (or an embryo). This organism has been genetically modified. Adding new genes can create plants that are more resistant to pests or be more tolerant to weather patterns, such as drought. This technology can also be used to mass produce chemicals, such as human growth hormone, by inserting that gene into bacteria. In order to combine the DNA, a chemical called a restriction enzyme is used to cut the DNA into fragments, exposing the gene of interest. On either side of the gene is an area of DNA called the “sticky end.” The bases of the sticky end are ready to be paired to the new DNA following the base-pair rule. That gene is then spliced to the other organism’s DNA using another enzyme called ligase, the joining procedure is called ligation. Sometimes scientists want a gene removed without the sticky ends, so that it will not bind to other parts of DNA. These fragments are said to have “blunt ends”. *Recombinant DNA is often abbreviated as rDNA to denote that it has foreign genes (DNA) inserted into its genome. This image shows a restriction enzyme called EcoRI being used to cleave a section of DNA. Different restriction enzyme will cleave DNA at different sequence points, called recognition sites, so scientists must isolate the right enzyme for the job – one that cuts around the desired gene. You will often see restriction enzyme sites written like this: G / A A T T C. How is DNA Manipulated? 1. Explain the following terms and their role in recombinant DNA technology a) Restriction enzyme __________________________________________________________________ b) Recognition site ____________________________________________________________________ c) Sticky end ________________________________________________________________________ d) Ligation ___________________________________________________________________________ Here are some restriction enzymes and their sites. BAMHI HindIII EcoRI SalI G/GATCC PstI A/AGCTT G/AATTC HhaI GCG/C HpaII C/CGG The following enzymes produce blunt, not sticky ends. TGG/CCA BalI ACC/GGT GTC/GAC HindII CAG/CTG G/TCGAC CTGCA/G 2. On each of the sequences below, determine which restriction enzyme could be used to splice the DNA and indicate where the cut will be made and the enzyme used. 5' T T T G A A T T C A G A T 3' 1. 3' A A A C T T A A G T C T A 5' 5' G T G G G A T C C C T T A 3' 2. 3' C A C C C T A G G G A A T 5' Enzyme: _______________ Enzyme: ________________ 5' A C G C C T C C G G A G A 3' 3' T G C G G A G G C C T C T 5' 5' T T A A G C T T A A G A A G C T T 3' 4. 3' A A T T C G A A T T C T T C G A A 5' 5' A A G C G C G T C G A C T T A T A 3' 5. 3' T T C G C G C A G C T G A A T A T 5' 5' A A T G G C G G A T C C A A A C G C G A A T T C G G G 3' 6. 3' T T A C C G C C T A G G T T T G C G C T T A A G C C C 5' 3. Enzyme: _______________ Enzyme: _______________ Enzyme: _______________ Enzyme: _______________ 3. Create a restriction enzyme that will remove the gene of interst. Give it a name too!