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While hallmarks of rodent spermatogonia stem cell biomarkers' heterogeneity have recently been identified, their stage and subset distributions remain unclear. Furthermore, it is currently difficult to accurately identify subset-specific SSC marker distributions due to the poor nuclear morphological characteristics associated with fixation in 4% paraformaldehyde. In the present study, testicular cross-sections and whole-mount samples were Bouin fixed to optimize nuclear resolution and visualized by immunohistochemistry (IHC) and immunofluorescence (IF). The results identified an expression pattern of PLZF high c-KIT pos in A 1 spermatogonia, while A 2 -A 4 -differentiating spermatogonia were PLZF low c-KIT pos . Additionally, this procedure was used to examine asymmetrically expressing GFRA1 and PLZF clones, asymmetric A pr and false clones were distinguished based on the presence or absence of TEX14, a molecular maker of intercellular bridges, despite having identical nuclear morphology and intercellular distances that were &lt;25 μm. In conclusion, this optimized Bouin fixation procedure facilitates the accurate identification of spermatogonium subsets based on their molecular profiles and is capable of distinguishing asymmetric and false clones. Therefore, the findings presented herein will facilitate further morphological and functional analysis studies and provide further insight into spermatogonium subtypes.

asian journal of andrology/asian journal of andrology

PLZFposc-KITpos-delineated A1–A4-differentiating spermatogonia by subset and stage detection upon Bouin fixation