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Long noncoding RNAs (lncRNAs) are important regulators of various biological processes, including spermatogenesis. Our previous studies have revealed the regulatory loop ofmrhl RNA and Wnt signaling, wheremrhl RNA negatively regulates Wnt signaling and gets downregulated upon Wnt signaling activation. This downregulation ofmrhl RNA is important for the meiotic progression of spermatogonial cells. In our present study, we identified the transcription factor Sox8 as the regulatory link betweenmrhl RNA expression, Wnt signaling activation, and meiotic progression. In contrast to reports from other groups, we report the expression of Sox8 in germ cells and describe the molecular mechanism ofSox8 regulation bymrhl RNA during differentiation of spermatogonial cells. Binding ofmrhl RNA to theSox8 promoter is accompanied by the assembly of other regulatory factors involving Myc-Max-Mad transcription factors, corepressor Sin3a, and coactivator Pcaf. In the context of Wnt signaling, Sox8 directly regulates the expression of premeiotic and meiotic markers. Prolonged Wnt signaling activation in spermatogonial cells leads to changes in global chromatin architecture and a decrease in levels of stem cell markers.

Mrhl Long Noncoding RNA Mediates Meiotic Commitment of Mouse Spermatogonial Cells by Regulating Sox8 Expression