Spontaneous clinical and anatomical pathology findings in SDRG rats

Bertani V
Evotec
March 4, 2026
Vet Pathol
https://pubmed.ncbi.nlm.nih.gov/41782294/

This article is currently being updated. View its version on PubMed.

https://pubmed.ncbi.nlm.nih.gov/41782294/

Research summary

This study characterizes SDRG immunodeficient rats on a Sprague Dawley background with targeted deletion of Rag1 and Il2rg between 10 and 26 weeks of age. Hematology showed markedly reduced lymphocytes with increased neutrophils, monocytes and eosinophils. Clinical chemistry differences included increased urea and cholesterol and decreased albumin and total protein. Immunophenotyping confirmed absence of B cells, T cells and NK cells. Histopathology revealed lymphoid organ hypoplasia, inflammatory changes in kidney and lung, and age related cardiomyopathy and nephropathy. These findings provide baseline pathology data for this immunodeficient model.

Key outcome of the study

SDRG rats lack B cells, T cells and NK cells and display predictable hematologic and biochemical alterations. Background inflammatory and degenerative lesions were documented to guide interpretation of preclinical studies.

Model

SDRG rats lack B cells, T cells and NK cells and display predictable hematologic and biochemical alterations. Background inflammatory and degenerative lesions were documented to guide interpretation of preclinical studies.

TARGET:
Rag1, Il2rg
Synonyms:
Rag1: recombination activating gene 1, RAG1 Il2rg: interleukin 2 receptor gamma chain, IL2R gamma

Keywords

Immunodeficient rat model, immuno oncology, cell therapy testing, baseline pathology characterization, translational disease modeling

Technical specifications

Targeted deletion of Rag1 and Il2rg on Sprague Dawley background, hematology and clinical chemistry panels, flow cytometry immune profiling, gross necropsy, histopathology evaluation across age groups

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genO-SDRG

The immunodeficient genO-SDRG rat model is a double Knockout for Rag1 and IL-2Rγ genes (Rag1-/- Il2rγ-/-), resulting in a B, T, and NK cell deficiency.

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