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Non-radioisotopic detection of human xenogeneic DNA in a mouse transplantation model
T F Weisberg1, B K Cahill, C P Vary
1Division of Medical Oncology, Maine Medical Center, Portland, USA.
Abstract:
Xenogeneic mouse models are widely used for the study of human tumor growth and metastasis. To date, few methods have been developed to track and quantitate the colonization of mouse organs with transplanted human cells. In this paper, a family of nonradioisotopic DNA oligonucleotide probes that are complementary to sequences within the human Alu element are characterized. These probes can be used in Southern hybridization reactions to quantitate the colonization of mouse organs with human derived cells. One oligonucleotide probe, the Alu-C probe, was identified as the most sensitive and specific in the family of probes synthesized for the distinction of human genomic DNA in a mouse genomic DNA background. The Alu-C probe can identify 0.05 ng human diploid DNA in a mouse background of 500 ng of genomic DNA. This represents 7.5 human diploid cells admixed with 75,000 mouse diploid cells. The Alu-C probe can therefore be employed to assess human colonization in xenograft models for a variety of human tumors and non-neoplastic tissues.
Insights
Researchers developed a new DNA probe to track human cells in mouse models. This method accurately quantifies human cell colonization in mouse organs, aiding cancer research.
Area of Science:
- Biotechnology
- Genomics
- Cancer Research
Background:
- Xenogeneic mouse models are crucial for studying human tumor development and metastasis.
- Accurate methods for tracking and quantifying human cell colonization in mouse organs are limited.
Purpose of the Study:
- To characterize a family of nonradioisotopic DNA oligonucleotide probes for detecting human cells in mouse models.
- To identify a sensitive and specific probe for quantifying human cell colonization in xenograft studies.
Main Methods:
- Development and characterization of DNA oligonucleotide probes targeting the human Alu element.
- Utilizing Southern hybridization reactions to detect and quantify human genomic DNA within a mouse genomic DNA background.
- Assessing the sensitivity and specificity of the Alu-C probe for human DNA detection.
Main Results:
- A family of DNA probes complementary to the human Alu element was synthesized.
- The Alu-C probe demonstrated high sensitivity and specificity, detecting as little as 0.05 ng of human DNA in 500 ng of mouse DNA.
- This sensitivity corresponds to detecting approximately 7.5 human diploid cells admixed with 75,000 mouse diploid cells.
Conclusions:
- The Alu-C probe is an effective tool for accurately quantifying human cell colonization in mouse xenograft models.
- This method facilitates the assessment of human tumor and non-neoplastic tissue engraftment in preclinical studies.
- The developed probe offers a nonradioisotopic approach for tracking human cell presence in vivo.