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Related Experiment Video

Updated: May 11, 2025

Efficient Purification and LC-MS/MS-based Assay Development for Ten-Eleven Translocation-2 5-Methylcytosine Dioxygenase

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Published on: October 15, 2018

A Rapid Approach for Identifying Cell Lines Lacking Functional Cytidine Deaminase.

Anna Ligasová¹, Markéta Kociánová², Karel Koberna¹

¹Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry and Czech Advanced Technology and Research Institute, Palacký University Olomouc, Hněvotínská 5, 779 00 Olomouc, Czech Republic.

International Journal of Molecular Sciences

|April 17, 2025

Summary

Researchers developed a rapid method to identify cells lacking cytidine deaminase (CDD) by detecting 5-fluorouridine in RNA. This technique aids in understanding pyrimidine salvage pathways.

Keywords:

5-fluorocytidine deamination 5-fluorouridine cytidine deaminase equilibrative and concentrative nucleoside transporters

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Last Updated: May 11, 2025

Efficient Purification and LC-MS/MS-based Assay Development for Ten-Eleven Translocation-2 5-Methylcytosine Dioxygenase

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Area of Science:

Biochemistry
Molecular Biology
Cell Biology

Background:

Cytidine deaminase (CDD) is crucial for the pyrimidine salvage pathway.
Identifying cells with deficient CDD function is important for various biological and medical applications.
Existing methods for CDD deficiency identification can be time-consuming or complex.

Purpose of the Study:

To develop a novel, rapid method for identifying cell lines lacking functional cytidine deaminase.
To investigate the correlation between CDD content and the cytotoxicity ratio of 5-fluorocytidine/5-fluorouridine.
To explore potential correlations with other related enzymes and transporters.

Main Methods:

Utilized immunocytochemical detection of 5-fluorouridine in cellular RNA as a marker for CDD activity.
Employed an anti-bromodeoxyuridine antibody that cross-reacts with 5-fluorouridine.
Subsequent detection using a fluorescently labeled antibody for rapid cellular identification.

Main Results:

Successfully developed and validated a rapid (within two hours) method for identifying CDD-deficient cell lines.
Demonstrated a strong positive correlation between the 5-fluorouridine/5-fluorocytidine cytotoxicity ratio and cellular cytidine deaminase content.
Found no significant correlation between this cytotoxicity ratio and deoxycytidine monophosphate deaminase, equilibrative nucleoside transporters 1 or 2, or concentrative nucleoside transporters 1, 2, or 3.

Conclusions:

The novel immunocytochemical method provides a fast and effective means to identify cells lacking functional cytidine deaminase.
The 5-fluorouridine/5-fluorocytidine cytotoxicity ratio serves as a reliable indicator of cytidine deaminase activity.
Other nucleoside transporters and deaminases do not appear to be primary determinants of this specific cytotoxicity ratio.