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Plant DNA Repair and Agrobacterium T-DNA Integration.

Stanton B Gelvin¹

¹Department of Biological Sciences, Purdue University, West Lafayette, IN 47907-1392, USA.

International Journal of Molecular Sciences

|August 27, 2021

Summary

Agrobacterium tumefaciens transfers DNA (T-DNA) to plants, integrating it into the plant genome. This review examines the controversial role of DNA repair mechanisms in T-DNA integration, suggesting known or novel pathways are involved.

Keywords:

Agrobacterium DNA polymerase θ DNA repair T−DNA borders T−DNA integration chromatin genome rearrangements microhomology−mediated end−joining (MMEJ)non-homologous end-joining (NHEJ)

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Area of Science:

Plant molecular biology
Microbial genetics
Genomics

Background:

Agrobacterium species are known for transferring T-DNA into plant cells, a process crucial for genetic engineering.
T-DNA integration into the plant genome is characterized by deletions, filler DNA, microhomology, and chromosomal rearrangements.
The mechanism of T-DNA integration is hypothesized to involve plant DNA repair pathways, but this remains debated.

Purpose of the Study:

To review and critically analyze the existing literature on T-DNA integration mechanisms.
To discuss the controversial involvement of plant DNA repair proteins and Agrobacterium proteins in T-DNA integration.
To propose potential models for T-DNA integration based on current evidence.

Main Methods:

Literature review and critical analysis of published studies.
Discussion of experimental evidence and contradictory findings.
Synthesis of information to propose integration mechanisms.

Main Results:

T-DNA integration is associated with genomic alterations similar to those observed during DNA break repair.
Contradictory results exist regarding the specific roles of plant and Agrobacterium proteins in integration.
Evidence suggests that T-DNA integration may utilize multiple known DNA repair pathways or novel mechanisms.

Conclusions:

The precise molecular mechanisms underlying T-DNA integration are not fully elucidated.
Both known and potentially novel DNA repair pathways likely contribute to T-DNA integration.
Further research is needed to resolve the controversies and identify specific proteins involved.