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Exon amplification from complete libraries of genomic DNA using a novel phage vector with automatic plasmid excision
Abstract:
The identification of transcription units in the vicinity of chromosomal lesions found in tumours is an essential step in the identification of new oncogenes. Here, we describe a lambda phage vector system for genomic exon-trapping (lambda GET), which dramatically simplifies the task of exon amplification from genomic DNA. The vector accommodates about 6.5 to 19 kb of DNA and allows inserts to be automatically subcloned as multi-copy plasmids containing splice donor and acceptor sites positioned flanking the inserted genomic DNA. RNA transcripts derived from such plasmids are processed in vivo and exons contained within the inserted genomic fragments become flanked by known sequences in the resulting mRNAs. RNA-based PCR can then be used for subsequent cloning and sequence analysis of trapped exons. We have exploited the large cloning capacity of lambda GET to construct highly redundant complete genomic libraries from Sau3AI partially digested vertebrae DNAs. Using this system, we have analysed a region of about 1 MB around the mouse neurofibromatosis-1 locus and have identified novel transcription units flanking the Nf-1 gene.
Insights
Researchers developed a lambda phage vector system for genomic exon-trapping (lambda GET) to identify new oncogenes near tumor chromosomal lesions. This method simplifies exon amplification and aids in discovering novel transcription units, like those flanking the mouse Nf-1 gene.
Area of Science:
- Molecular Biology
- Genomics
- Cancer Research
Background:
- Identifying transcription units near chromosomal lesions is crucial for discovering oncogenes.
- Existing methods for exon amplification can be complex and time-consuming.
Purpose of the Study:
- To introduce a novel lambda phage vector system, lambda GET, for simplified genomic exon-trapping.
- To facilitate the identification of novel oncogenes and transcription units in tumor-associated chromosomal regions.
Main Methods:
- Development of the lambda phage vector system (lambda GET) for genomic exon-trapping.
- Utilizing lambda GET to create redundant genomic libraries from vertebrate DNA.
- Analyzing a 1 MB region around the mouse neurofibromatosis-1 (Nf-1) locus.
Main Results:
- The lambda GET system simplifies exon amplification from genomic DNA.
- Novel transcription units flanking the mouse Nf-1 gene were identified.
- The system allows for efficient construction of genomic libraries and subsequent sequence analysis.
Conclusions:
- The lambda GET system is an effective tool for genomic exon-trapping and oncogene discovery.
- This method significantly simplifies the process of identifying novel transcription units.
- The findings contribute to understanding gene regulation near critical genomic loci.