welcome!!. SAGE TECHNOLOGY AND ITS APPLICATIONS. PRESENTED BY Dr. R.A.Siddique & Dr.Anand Kumar Animal Biochemistry Division N.D.R.I., Karnal (Haryana)India, 132001 E-mail: [email protected] WHAT IS SAGE?.
Limited use of this sensitive technique in academic research laboratories
Trap RNAs with beads
The biotinylated 3’ cDNA are affinity purified using strepatavidin
coated magnetic beads.
PRIMER TE AE TAG
And data presentation
1. Isolate mRNA.
2.(b) Synthesize ds cDNA.
3.(a) Bind to streptavidin-coated beads.
3.(b) Cleave with “anchoring enzyme”.
4.(a) Divide into two pools and add linker sequences:
5. Cleave with “tagging enzyme”.
6. Combine pools and ligate.
7. Amplify ditags, then cleave with anchoring enzyme.
8. Ligate ditags.How does SAGE work?
3.(c) Discard loose fragments.
9. Sequence and record the tags and frequencies.
Sage reference databases:
Maps available at http://www.ncbi.nlm.nih.gov/SAGE
Detects 3’ region of transcript. Restriction site is determining factor.
Collects sequence information and copy no.
Sequencing error and quantitation bias.
Targets various regions of the transcript.Base composition for specificity of hybridization.
Fluorescent signals and signal intensity.
Labeling bias and noise signals.COMPARISON……
MmeI digestion of dsDNA
Ligation to second linker
XmaJI tag1 tag2 XmaJI
PAIRED END DITAG