Running a DNA BLAST
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In this section, we will run a DNA
BLAST
using the system at NCBI in the USA, and restrict the search to the human genome data.
Restricting a search to a given species, be it in a protein or DNA search, can be very useful as it can help reduce the 'noise' from similar or related sequences in other organisms.
To run a DNA
BLAST search, we need a sequence. For this search we will use:
TGGCTTGAAGTCCCCTCCTCCATCCCGGGGATCACGTTTTGCCTGGGGGAGCTGATCGCAAGACTAGGCAACCTCCAGCCAGTCCCTGGGTCGGGCGGATCCTCCCAGAGGTGGCACAATGGAGCGATCTCCAGGAGAGGGCCCCAGCCCCAGCCCCATGGACCAGCCCTCTGCTCCCTCCGACCCCACTGACCAGCCCCCCGCTGCTCACGCAAAGCCAGACCCAGGTTCTGGGGGCCAACCTGCTGGCCCTGGCGCGGCGGGTGAGGCCCTGGCGGTGCTGACTTCATTCGGGAGGCGGTTGCTGGTGCTGATACCTGTGTATTTGGCCGGGGCAGTGGGACTCAGCGTGGGTTTCGTGCTCTTCGGCCTCGCCCTCTACCTGGGCTGGCGCCGGGTCCGCGACGAGAAAGAACGGAGCCTTCGAGCAGCGAGGCAGCTACTGGACGACGAGGAGCAGCTCACTGCGAAAACTCTCTATATGAGTCATCGAGAGCTACCTGCCTGGGTCAGCTTCCCAGACGTGGAAAAGGCTGAATGGCTCAATAAGATTGTGGCCCAGGTCTGGCCCTTCCTGGGCCAGTATATGGAGAAGCTTCTGGCTGAAACTGTGGCTCCGGCTGTTAGGGGATCTAACCCCCATCTGCAAACATTTACATTTACACGAGTGGAACTGGGTGAAAAGCCATTGCGCATCATTGGAGTCAAGGTTCACCCAGGTCAGAGAAAAGAGCAGATCCTGCTGGACTTGAACATCAGCTATGTAGGTGATGTGCAGATTGATGTGGAAGTGAAGAAATATTTTTGCAAAGCAGGAGTCAAGGGCATGCAGCTACATGGCGTTTTGCGGGTGATACTGGAGCCACTCATTGGGGACCTTCCCTTCGTGGGGGCTGTGTCAATGTTCTTCATCCGACGCCCGACCCTAGACATCAACTGGACAGGGATGACCAACCTGCTGGATATCCCAGGACTTAGCTCACTCTCTGACACCATGATCATGGACTCCATTGCTGCCTTCCTCGTGTTGCCCAACCGATTACTGGTGCCCCTTGTGCCTGACCTTCAAGATGTGGCTCAGTTGCGTTCCCCTCTGCCCAGGGGCATTATTCGAATTCACCTGCTGGCTGCTCGAGGGCTGAGTTCCAAGGACAAATATGTGAAGGGCCTGATTGAGGGCAAGTCAGACCCATATGCACTTGTGCGTTTGGGTACCCAGACATTCTGCAGTCGTGTCATTGATGAAGAACTCAACCCACAGTGGGGAGAGACTTATGAGGTGATGGTACACGAGGTCCCAGGGCAGGAGATTGAAGTGGAGGTGTTCGACAAGGATCCAGATAAAGATGACTTTCTGGGCAGAATGAAGCTGGATGTAGGGAAGGTGTTACAGGCTAGCGTTCTGGATGATTGGTTCCCTCTACAAGGTGGGCAAGGCCAAGTTCACTTGAGGCTAGAATGGCTGTCACTTTTGTCAGATGCAGAGAAACTGGAGCAGGTTCTACAGTGGAATTGGGGAGTCTCCTCTCGACCAGATCCCCCGTCAGCTGCCATCTTAGTTGTCTACCTGGATCGGGCCCAGGATCTTCCTCTGAAGAAGGGGAACAAGGAACCCAACCCTATGGTACAACTGTCAATTCAGGATGTGACTCAGGAGAGCAAGGCTGTCTACAGTACCAACTGCCCAGTGTGGGAGGAAGCGTTCCGGTTCTTCCTACAAGACCCTCAAAGCCAGGAGCTCGATGTGCAAGTGAAGGATGATTCCAGGGCCCTGACTTTAGGAGCACTGACGCTGCCTCTGGCCCGCCTGCTGACTGCCCCAGAACTCATCCTGGACCAGTGGTTCCAGCTCAGCAGCTCTGGTCCAAACTCCAGACTCTATATGAAACTAGTCATGAGGATCCTGTACTTGGATTCATCAGAAATATGCTTCCCCACGGTGCCTGGTTGTCCTGGTGCTTGGGACGTGGACAGTGAGAATCCCCAGAGAGGCAGCAGTGTGGATGCCCCACCTCGACCCTGTCACACGACTCCTGATAGCCAGTTTGGGACTGAGCATGTGCTTCGGATCCATGTATTAGAGGCCCAGGACCTGATTGCCAAAGACCGTTTCTTGGGGGGACTGGTGAAGGGCAAGTCAGACCCCTATGTCAAACTAAAGTTGGCAGGACGAAGCTTCCGGAGCCATGTTGTTCGGGAAGATCTCAATCCCCGCTGGAATGAGGTTTTTGAGGTGATCGTCACATCAGTTCCAGGCCAAGAGCTAGAGGTTGAAGTCTTTGACAAGGACTTGGACAAGGATGATTTTCTGGGCAGGTGTAAAGTGCGTCTCACCACAGTCTTAAACAGTGGCTTCCTTGATGAGTGGCTGACCCTGGAGGATGTCCCATCTGGCCGCCTGCACTTGCGCCTGGAGCGTCTCACCCCCCGTCCCACTGCTGCTGAGTTAGAGGAGGTGCTGCAGGTGAATAGTTTGATCCAGACTCAGAAGAGTGCGGAGCTGGCTGCGGCCCTGCTATCCATCTATATGGAGCGGGCAGAGGACCTCCCGCTGCGAAAAGGCACCAAGCACCTCAGCCCTTATGCTACTCTCACTGTGGGAGATAGTTCTCATAAAACCAAGACTATTTCGCAAACTTCAGCCCCTGTCTGGGATGAGAGTGCCTCCTTTCTCATCAGGAAACCACACACTGAGAGCCTAGAGTTGCAGGTTCGGGGTGAGGGCACTGGCGTGCTGGGCTCATTATCCCTGCCCCTCTCAGAGCTCCTCGTGGCTGACCAGCTCTGCTTGGACCGCTGGTTTACACTCAGCAGTGGTCAGGGGCAGGTGCTACTGAGAGCACAGCTAGGGATCCTGGTGTCCCAGCACTCGGGAGTGGAAGCTCATAGCCACAGCTACAGCCACAGCTCCTCATCGCTGAGTGAAGAACCAGAGCTCTCGGGGGGACCCCCTCACATCACCTCCTCAGCCCCAGAGCTCCGGCAGCGCCTAACACATGTTGACAGTCCCCTTGAGGCTCCAGCCGGGCCTCTGGGCCAGGTGAAACTGACTCTGTGGTACTACAGTGAAGAACGAAAGCTGGTCAGCATTGTTCATGGTTGCCGGTCCCTTCGACAGAATGGACGTGATCCTCCTGATCCCTATGTGTCACTGTTGCTACTGCCAGACAAGAACCGAGGCACCAAGAGGAGGACCTCACAGAAGAAGAGGACCCTGAGTCCTGAATTTAATGAACGGTTTGAGTGGGAACTCCCCCTGGATGAGGCCCAGAGACGAAAGCTGGATGTCTCTGTCAAGTCTAATTCCTCCTTCATGTCAAGAGAGCGTGAGCTGCTGGGGAAGGTGCAGCTGGACCTAGCTGAGACAGACCTTTCCCAGGGTGTAGCCCGGTGGTATGACCTGATGGACAACAAGGACAAGGGCAGCTCCTAGGAGCTGGCGAGTCCCAGCCTGACTGCTCTGTCTTCCTGCCTTCGTCTCGCTCCATCACCGCCTCAATGTGATGAGCCTAAAGCTAGGGTCCAAGGGCAGAGCCTGTGCCCTTCAGCCCTTTCACCTAACAGGCCCATATTCGGGCCTTTGCCTGACCAAAGAGAAGAACCGTATGTTCCCTTTACTGCACGGCCTTTATCCTTCTGGGCCCCTGGGGCGGGGACCTGAGCTGGCTGTTTCCTGCTTTGCCTGCACATTGTTCTCCCTTCCTCCCAACTCCTCAGGGCCTTCTGTATCTGTGCCTGGCCAGTGGCAGCACTAGCAGTGGTATTAGCTTATGCCAAATACAGCTTTGGAAGGATCTTTTTTTCTTTAACTAGATGGTCACCTTCTTCCCTACCACACATGGGTGGGAAGGTGGACAGGCTAACCTCTCCAGCTGTGAGCCTCTTAGACTACTGCATGTAGCAAATGTTCAGCAGCTCAGGCCCCCATGTCCAGTTCTGTCCCCACTGTCCTCAACCCTGTCCTGAAAATTCTACTGCTTTGATGGCTGGGGCCAGTCTCTTGTCACTTTGGAAACTGAGGACGCGTGGATTCTACTCAAGCCTCCAAGTAGTGGCATATCAGTCTTGGAGCTCCTAGCTGGTGATACGGAGAGGGCTTTGGAGGACTTGGGACAGCAGGGCCAATTTTTTTGCCCAAGTGCCTAGGCTGCTAACTCACTGACTAGAACTTAATCTGGTACTTTACAGTTTTGCACCAACTCTGCCAAGCCACTGGATCTTACATTAAACATCATACTCAAACCAGCAAAAAAAA
(To copy the sequence highlight it by double click on it, and then use the copy command - BTW, the reason the sequence is a big long line of letters that goes off the edge of the screen is so you can double-click on it to select it.)
And asked to:
- identify the article (paper) in which it was first cloned
- establish if the DNA is involved in any diseases
NOTE: NCBI sometimes remembers changes you have made to the default parameters. Changes are highlighted in YELLOW. Therefore, before you run a search make sure the parameters are set to the values you want (N.B. The default expect value is 10, and the default database is 'non-redundant'). To return the page to 'default' click 'Reset page' near the top of the page.
- Go to the BLAST site http://www.ncbi.nlm.nih.gov/blast/
- On the BLAST page (which should have opened in a new window) in the 'Basic BLAST' section click the 'nucleotide blast' link.
- Enter (paste) the sequence into the search box.
- Change the database to 'Human genomic plus transcript (Human G+T)'
The completed nucleotide BLAST screen - make sure the database setting is correct
- Click on the BLAST button and wait....
BLAST search running - Sunday October 14, 2018 at 1:47:12 pm