T-dna Transfer
T-dna Transfer - Related Videos
09:04
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We demonstrate a method for grafting cultured cells into defined sites of early mouse embryos to determine their in vivo potential. We also introduce an optimized electroporation method that uses glass capillaries of known diameter, allowing the precise delivery of exogenous DNA into a few cells in the embryos.
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Genetic transfer occurs when genetic information is passed from one organism to another. It occurs via two mechanisms: vertical gene transfer and horizontal gene transfer. Vertical gene transfer occurs when genetic information is transferred from one generation to the next, which happens much more frequently than horizontal gene transfer. Both sexual and asexual reproduction are forms of vertical gene transfer, where one or more organisms pass some or all of their genome onto their progeny.
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Amplification, Next-generation Sequencing, and Genomic DNA Mapping of Retroviral Integration Sites
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12:52
Conjugation: A Method to Transfer Ampicillin Resistance from Donor to Recipient E. coli
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2023
Source: Alexander S. Gold1, Tonya M. Colpitts1 1 Department of Microbiology, Boston University School of Medicine, National Emerging Infections Diseases Laboratories, Boston, MA First discovered by Lederberg and Tatum in 1946, conjugation is a form of horizontal gene transfer between bacteria that relies on direct physical contact between two bacterial cells (1). Unlike other forms of gene transfer, such as transformation or transduction, conjugation is a naturally occurring process in which...
03:06
From DNA to Protein
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2020
The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
FAQs
Plant wound signals serve as the cues that Agrobacterium uses to recognize a suitable host environment. These signals activate virulence genes, which coordinate processing of the T-DNA region and its subsequent delivery into the plant cell. Without this signal-dependent activation, the bacterial system would not proceed through the transfer pathway described for gene delivery.
Virulence genes activate the molecular functions required to prepare and deliver the T-DNA. After Agrobacterium detects plant wound signals, these genes promote processing of the T-DNA region on the Ti plasmid and support transport of the resulting DNA complex into the plant cell. Their activation therefore connects host recognition with DNA delivery.
Processing produces a single-stranded DNA complex that can be transported from Agrobacterium into the plant cell. This intermediate represents a prepared form of the T-DNA rather than the original plasmid region. After entry, the complex can move toward the nucleus, where the transferred DNA may integrate into the plant genome.
Nuclear entry places the transferred DNA in the cellular compartment where genome integration can occur. This step is important because delivery into the plant cell alone does not establish the introduced sequence within the plant’s genetic material. When integration occurs, the transferred DNA can support stable experimental or trait-related outcomes in plant molecular biology.
The process begins when Agrobacterium detects wound signals from a plant. Virulence genes then become activated, the T-DNA region of the Ti plasmid is processed, and a single-stranded DNA complex is transported into the plant cell. The complex can subsequently enter the nucleus and integrate into the plant genome, completing the delivery pathway.
Researchers use the mechanism to introduce selected genes into plant cells and examine the effects of those genes. Such experiments can help connect an introduced sequence with observable biological outcomes, making the system useful for investigating gene function. The same delivery capability also supports the production of transgenic plants for broader molecular biology studies.
T-DNA transfer supports the production of transgenic plants and the introduction of genes associated with useful traits. The overview identifies disease resistance and stress tolerance as examples of improvement goals. In this context, the system links a natural bacterial DNA-delivery mechanism with plant biotechnology, allowing researchers to investigate or develop plants with selected genetic characteristics.