Related Experiment Videos
Transposable element Tc1 of Caenorhabditis elegans recognizes specific target sequences for integration
I Mori1, G M Benian, D G Moerman
1Department of Genetics, Washington University School of Medicine, St. Louis, MO 63110.
Summary
The transposable element Tc1 in Caenorhabditis elegans shows specific insertion site preferences. Tc1 integrates at a T-A dinucleotide, influenced by flanking nucleotides, revealing a consensus target sequence.
Area of Science:
- Genetics
- Molecular Biology
- Nematology
Background:
- Tc1 is a transposable element in the nematode Caenorhabditis elegans.
- Tc1 movement frequency is genetically controlled, with non-random insertion site distribution.
- High Tc1 insertion frequency in the unc-22 gene suggests preferred target sites.
Purpose of the Study:
- To identify the specific features of Tc1 target sites.
- To determine the consensus sequence for Tc1 integration.
Main Methods:
- Sequencing of seven independent Tc1 transposition sites within the unc-22 gene.
- Sequencing of three additional Tc1 insertion sites.
- Comparative analysis of sequenced sites with two literature-reported sites.
Main Results:
- Tc1 integrates at the dinucleotide T-A in all analyzed sites.
- Integration is dependent on specific flanking nucleotides (5' and 3').
- A consensus target sequence for Tc1 integration was identified: G-A-K-A-T-A-T-G-T (K = G or T).
Conclusions:
- Tc1 exhibits sequence specificity in its transposition mechanism.
- The identified target site consensus has implications for understanding Tc1 transposition.
- This knowledge can aid in using Tc1 for transposon-tagging and gene cloning.