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Efficient construction of sequence-specific TAL effectors for modulating mammalian transcription
Feng Zhang1, Le Cong, Simona Lodato
1Harvard University, Cambridge, Massachusetts, USA.
Nature Biotechnology
|January 21, 2011
Summary
Researchers developed a novel method to easily synthesize custom DNA-binding proteins called transcription activator-like effectors (TALEs). This breakthrough enables precise targeting of specific DNA sequences for biological engineering and gene regulation studies.
Area of Science:
- Molecular Biology
- Synthetic Biology
- Genetics
Background:
- Directing functional proteins to specific DNA sequences is crucial for biological process study and engineering.
- Transcription activator-like effectors (TALEs) are DNA-binding proteins from Xanthomonas sp. that can be engineered for targeted DNA binding.
- Synthesizing new TALE variants is challenging due to their numerous repeat domains.
Purpose of the Study:
- To develop an efficient method for synthesizing customized transcription activator-like effector (TALE) variants.
- To overcome the difficulties associated with synthesizing TALE repeat domains.
Main Methods:
- Leveraging codon degeneracy and type IIs restriction enzymes to create orthogonal ligation linkers.
- Employing hierarchical ligation to construct full-length, customized TALE repeat domains.
- Synthesizing 17 TALEs designed for specific DNA-binding sites.
Main Results:
- A method was developed to overcome challenges in synthesizing TALE variants.
- Customized TALE repeat domains were constructed using hierarchical ligation.
- Synthesized TALEs specifically modulated the transcription of endogenous genes SOX2 and KLF4 in human cells.
Conclusions:
- The described method facilitates the efficient construction of customized TALE repeat domains.
- This approach enables precise targeting of specific DNA sequences for gene modulation.
- The findings have implications for the study and engineering of biological processes.
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