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SOP-027: Cell Line Authentication

Purpose​

To verify the identity of mammalian cell lines and prevent the use of misidentified, cross-contaminated, or substituted cell cultures.

Scope​

This SOP applies to all established mammalian cell lines received from external sources, recovered from long-term storage, or maintained for extended periods in culture.

Responsibilities​

The operator is responsible for:

  • Ensuring cell lines are authenticated according to laboratory policy.
  • Maintaining accurate authentication records.
  • Submitting samples for testing when required.
  • Reporting discrepancies in cell line identity.

Required Materials​

Reagents​

  • Sample collection materials appropriate for the selected authentication method

Equipment​

  • Class II Biosafety Cabinet
  • Sterile microcentrifuge tubes
  • Micropipettes and sterile tips
  • Laboratory documentation system
  • Personal protective equipment (PPE)

Procedure​

1. Identify Cultures Requiring Authentication​

Authenticate cell lines:

  • Upon receipt from an external source.
  • Before establishing a master stock.
  • Following long-term culture.
  • Before publication or sharing with collaborators.
  • Whenever cell identity is uncertain.

2. Prepare the Sample​

Collect the required sample using aseptic technique.

Ensure the sample is correctly labeled with:

  • Cell line name
  • Sample identification
  • Date
  • Operator

3. Perform Authentication​

Submit the sample for authentication using the laboratory-approved method.

Common methods include:

  • Short Tandem Repeat (STR) profiling (human cell lines)
  • Species identification assays
  • SNP profiling
  • DNA fingerprinting

4. Review Results​

Compare authentication results with the expected reference profile.

Investigate any discrepancies before further use of the culture.

5. Record Findings​

Document:

  • Authentication method
  • Date performed
  • Results
  • Corrective actions (if required)

Acceptance Criteria​

ParameterAcceptance Criterion
Cell line identityMatches reference profile
Sample labelingAccurate and complete
Authentication recordsComplete and traceable
Culture statusApproved for continued use

Critical Control Points​

  • Authenticate new cell lines before routine use.
  • Maintain traceable sample identification.
  • Use validated authentication methods.
  • Investigate unexpected authentication results immediately.
  • Maintain documentation for all authenticated cell lines.

Documentation​

Record the following:

  • Date
  • Cell line
  • Passage number
  • Authentication method
  • Authentication result
  • Operator initials
  • Corrective actions (if applicable)

Quality Control​

Verify:

  • Samples are correctly labeled.
  • Authentication records are complete.
  • Cell line identity matches reference data.
  • Deviations have been investigated and documented.

Troubleshooting​

ObservationPossible CauseCorrective Action
Authentication mismatchCell line misidentification or cross-contaminationQuarantine the culture and investigate immediately
Inconclusive resultPoor sample qualityCollect a new sample and repeat authentication
Missing reference profileIncomplete documentationObtain an authenticated reference profile before further use
Unexpected species identificationCross-species contaminationDiscontinue use until identity is confirmed

Safety Considerations​

  • Handle all cultures as potentially biohazardous.
  • Wear appropriate personal protective equipment (PPE).
  • Perform sample collection using aseptic technique.
  • Dispose of biological waste according to institutional biosafety procedures.
  • Maintain confidentiality and integrity of laboratory records.