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Reproductive Cloning

Reproductive Cloning

Reproductive cloning is the process of producing a genetically identical copy—a clone—of an entire organism. While clones can be produced by splitting an early embryo—similar to what happens naturally with identical twins—cloning of adult animals is usually done by a process called somatic cell nuclear transfer (SCNT).
Somatic Cell Nuclear Transfer
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Clonality Testing in Veterinary Medicine: A Review With Diagnostic Guidelines.

S M Keller¹, W Vernau², P F Moore³

¹Department of Pathobiology, Ontario Veterinary College, University of Guelph, Guelph, Ontario, Canada.

Veterinary Pathology

|March 3, 2016

Summary

Molecular clonality assays aid in distinguishing reactive from neoplastic lymphoid proliferations, crucial for accurate veterinary diagnoses. This review details their use, limitations, and proposes guidelines for consistent application.

Keywords:

PCR genomic DNA leukemia lymphocyte antigen receptor gene rearrangement lymphoma molecular clonality testing veterinary medicine

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Area of Science:

Veterinary Pathology
Molecular Diagnostics
Immunology

Background:

Accurate differentiation of reactive and neoplastic lymphoid proliferations is critical for appropriate prognosis and treatment in veterinary medicine.
Molecular clonality assays, by assessing lymphocyte antigen receptor gene rearrangements, offer a tool to aid this distinction.
Challenges exist in interpreting these assays, especially in atypical cases or limited sample types.

Purpose of the Study:

To familiarize veterinary pathologists and clinicians with the principles, potential pitfalls, and limitations of molecular clonality testing.
To provide diagnostic guidelines for the harmonization of clonality testing in veterinary medicine.

Main Methods:

Review of existing literature on molecular clonality assays in veterinary diagnostics.
Analysis of the application of clonality testing in various lymphoid proliferation scenarios.
Discussion of interpretational complexities and sources of variability.

Main Results:

Molecular clonality assays are valuable adjuncts for diagnosing lymphoid proliferations, particularly in challenging cases like small tissue fragments or fluid samples.
These assays can also monitor neoplastic clone evolution over time and across different sites.
Significant challenges include interpreter dependency, lack of standardized practices, and varied terminology, impacting reproducibility.

Conclusions:

Molecular clonality testing is an indispensable tool but requires careful interpretation alongside clinical, morphologic, and immunophenotypic data.
Standardization of laboratory practices and interpretational guidelines is essential to improve the reliability and reproducibility of clonality testing in veterinary medicine.
This review provides a foundation for future harmonization efforts, aiming to enhance diagnostic accuracy.