Restriction landmark genomic scanning (RLGS) spot identification by second generation virtual RLGS in multiple
Dominic J Smiraglia1, Ramakrishnan Kazhiyur-Mannar, Christopher C Oakes
1Department of Cancer Genetics, and Comprehensive Cancer Center, Roswell Park Cancer Institute, Buffalo, NY, USA. dominic.smiraglia@roswellpark.org
BMC Genomics
|December 7, 2007
Summary
A new virtual Restriction Landmark Genomic Scanning (vRLGS) method enables accurate identification of CpG island methylation spots in any genome. This advance simplifies spot cloning and aids in discovering tissue-specific methylation patterns in cancer research.
Area of Science:
- Genomics
- Epigenetics
- Bioinformatics
Background:
- Restriction Landmark Genomic Scanning (RLGS) identifies CpG island hypermethylation in cancer.
- A key limitation of RLGS is assigning specific genomic sequences to identified spots (spot cloning).
Purpose of the Study:
- To develop a virtual RLGS (vRLGS) method for sequence identification of RLGS spots.
- To improve the accuracy of predicting DNA fragment migration patterns.
Main Methods:
- Developed a vRLGS system applicable to any sequenced genome and enzyme combination.
- Incorporated sequence information into DNA fragment migration models.
- Created a filtering method to reduce extraneous virtual spots.
Main Results:
- Achieved a median Euclidean distance of 0.18 cm between predicted and actual spot migration for human RLGS patterns.
- Confirmed identification of 795 human and 530 mouse RLGS spots.
- Demonstrated successful use of filtering for simplified spot cloning and tissue-specific methylation identification.
Conclusions:
- The vRLGS system is robust for novel RLGS spot identification.
- The migration models are broadly applicable across genomes and enzyme combinations.
- Identified hundreds of RLGS spot loci, confirming focus on CpG islands and providing a resource for methylation studies.
