Interlaboratory study to validate a STR profiling method for intraspecies identification of mouse cell lines.

Area of Science:

• Genetics
• Molecular Biology
• Biotechnology

Background:

• Accurate identification of mouse cell lines is crucial for reproducible scientific research.
• Short Tandem Repeat (STR) profiling offers a powerful tool for intraspecies cell line identification.
• Existing methods require validation for robust application in mouse cell line authentication.

Purpose of the Study:

• To validate a set of 19 mouse Short Tandem Repeat (STR) markers for intraspecies identification of mouse cell lines.
• To establish a public database of National Institute of Standards and Technology (NIST)-validated mouse STR profiles.
• To conduct an international interlaboratory study to assess the reliability and reproducibility of the STR profiling method.

Main Methods:

• A multiplex polymerase chain reaction (PCR) assay was developed targeting 19 mouse STR markers and 2 human STR markers.
• Twelve international laboratories participated in an interlaboratory study using 50 common mouse cell lines.
• STR profiles were generated and analyzed for concordance and discordance across participating laboratories.

Main Results:

• Eighteen of the 19 mouse STR markers demonstrated 100% concordance among laboratories for unique cell line identification.
• Discordance in 32 cell lines was identified and resolved, leading to assay improvements.
• The multiplex PCR method, using 18 of 19 markers, proved capable of discriminating between mouse cell lines with high agreement (>92%) among labs.

Conclusions:

• The validated multiplex PCR assay using 18 mouse STR markers is effective for intraspecies identification of mouse cell lines.
• The establishment of a public database of NIST-validated mouse STR profiles will enhance cell line authentication.
• Ongoing refinement of the assay, including allelic ladder development and stutter filters, will further improve accuracy.