Principal Investigators Meetings
Global Scanning of Single Nucleotide VariationsSherman Weissman
Table of Contents:
- Title and Author
- Outline of the Strategy for Global Scanning of Single Nucleotide Variations Between 2 Pools of DNA Duplex
- Expressing and Purification of hTDG and mTDG
- hTDG Mediated Cleavage of Mismatch DNA Containing G/T Pairing
- mTDG Mediated Cleavage of Mismatch Duplex with Different 5’ Neighbor Nucleotides and a Combination of Two Mismatches
- hTDG Specifically Binds to Mismatch Duplex
- Immobilized Glycosylases Specifically Enrich Mismatch Fragments and Perfect Matches under Different Conditions
- Immobilized Glycosylase hTDG Enriches Mismatched Fragments from a DNA Mixture
- Immobilized Glycosylases Enrich Perfectly Matched Fragments from a DNA Mixture
- Enrichment of a Mismatched DNA Duplex from a Mixture
- The Effect of Carrier DNA on the Specificity and Priority of DNA be bound and washed off
- Selective Amplification of the Heterohybrids with the Heterhybrids-Orientated Strategy
- Selective Amplification of Heterohybrids
- Gel Display of Different Subsets of Restriction Fragments with different contents: Perfect Match Pool to Mismatch Pool
- The Gel Display of the Mismatched Fragments of a human cDNA Pool without Sub-dividing
- PCR-Northern Blot Test of Candidate Gene Fragments that May Contain Single Nucleotide Mismatch
- Y4 Groups of Single Nucleotide Mismatches Are Fully Covered by Using 2 TDGs in Combination
- Spectrum of Mismatches Recognized by 2 TDGs
- Genomic "tiling" arrays
- Ratio of Mismatch to Perfect Match Products in each position of Genomic Array
- Potential Applications
Global Scanning of Single Nucleotide Variations
Dr. Sherman Weissman
Yale University
Fig.1: Outline of the Strategy for Global Scanning of Single Nucleotide Variations Between 2 Pools of DNA Duplex
Expressing and Purification of hTDG and mTDG
Fig. 2: Expressing and Purification of hTDG and mTDG
Fig. 3-1: hTDG Mediated Cleavage of Mismatch DNA Containing G/T Pairing
Fig. 3-2: mTDG Mediated Cleavage of Mismatch Duplex with Different 5’ Neighbor Nucleotides and a Combination of Two Mismatches
Figure 3-3: hTDG Specifically Binds to Mismatch Duplex
Fig. 4-1: Immobilized Glycosylases Specifically Enrich Mismatch Fragments and Perfect Matches under Different Conditions
Fig. 4-2: Immobilized Glycosylase hTDG Enriches Mismatched Fragments from a DNA Mixture
Fig. 4-3: Immobilized Glycosylases Enrich Perfectly Matched Fragments from a DNA Mixture
Fig. 5-1: Enrichment of a Mismatched DNA Duplex from a Mixture |
Fig. 5-2: The Effect of Carrier DNA on the Specificity and Priority of DNA be bound and washed off
Fig. 5: Selective Amplification of the Heterohybrids with the Heterhybrids-Orientated Strategy
Fig. 6-1: Selective Amplification of Heterohybrids
Fig. 6-2: Gel Display of Different Subsets of Restriction Fragments with different contents: Perfect Match Pool to Mismatch Pool
Fig. 6-3: The Gel Display of the Mismatched Fragments of a human cDNA Pool without Sub-dividing
Fig. 6-4: PCR-Northern Blot Test of Candidate Gene Fragments that May Contain Single Nucleotide Mismatch
4 Groups of Single Nucleotide Mismatches Are Fully Covered by Using 2 TDGs in Combination
A/G&C/T were not observed in this figure
hTDG | mTDG | Frequency | |
G/T and A/C | G/T*** | G/T*** | 62.5% |
C/T and A/G | C/T** | A/G*&C/T* | 20.1% |
G/G and C/C | G/G** | 10.9% | |
T/T and A/A | T/T** | 6.5% | |
InT/A/G/C | InT** | ||
AG/GT | *** | ||
GT/TG | *** | *** | |
Modified 4/20/01 |
Spectrum of Mismatches Recognized by 2 TDGs
Genomic "tiling" arrays
- 1. The Yale CEGS has created a tiling array of ca. 1 kb fragments spanning the unique sequences of chromosome 22 and other arrays are under construction.
- These arrays have the advantage of economy and accessibility but the disadvantage of poorer resolution than oligonucleotide arrays.
Ratio of Mismatch to Perfect Match Products in each position of Genomic Array
Potential Applications
- Detect somatic point mutations in neoplasia.
- Detect induced or spontaneous mutations in inbred model organisms.
- Detect regions of LOH or homozygous IBD.