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Histone methyltransferase DOT1L is essential for self-renewal of germline stem cells.

ABSTRACT: Self-renewal of spermatogonial stem cells is vital to lifelong production of male gametes and thus fertility. However, the underlying mechanisms remain enigmatic. Here, we show that DOT1L, the sole H3K79 methyltransferase, is required for spermatogonial stem cell self-renewal. Mice lacking DOT1L fail to maintain spermatogonial stem cells, characterized by a sequential loss of germ cells from spermatogonia to spermatids and ultimately a Sertoli cell only syndrome. Inhibition of DOT1L reduces the stem cell activity after transplantation. DOT1L promotes expression of the fate-determining HoxC transcription factors in spermatogonial stem cells. Furthermore, H3K79me2 accumulates at HoxC9 and HoxC10 genes. Our findings identify an essential function for DOT1L in adult stem cells and provide an epigenetic paradigm for regulation of spermatogonial stem cells.

SUBMITTER: Lin H

PROVIDER: S-EPMC9296001 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature

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Histone methyltransferase DOT1L is essential for self-renewal of germline stem cells.

Lin Huijuan H Cheng Keren K Kubota Hiroshi H Lan Yemin Y Riedel Simone S SS Kakiuchi Kazue K Sasaki Kotaro K Bernt Kathrin M KM Bartolomei Marisa S MS Luo Mengcheng M Wang P Jeremy PJ

Genes & development 20220623 11-12

Self-renewal of spermatogonial stem cells is vital to lifelong production of male gametes and thus fertility. However, the underlying mechanisms remain enigmatic. Here, we show that DOT1L, the sole H3K79 methyltransferase, is required for spermatogonial stem cell self-renewal. Mice lacking DOT1L fail to maintain spermatogonial stem cells, characterized by a sequential loss of germ cells from spermatogonia to spermatids and ultimately a Sertoli cell only syndrome. Inhibition of DOT1L reduces the ...[more]

PMID: 35738678

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Project description:Spermatogonial stem cells undergo both self-renewal to maintain the stem cell population and differentiation to produce mature sperm. These processes are controlled by both stem cell-intrinsic and external niche factors. DOT1L, the sole H3K79 methyltransferase, is dispensable for mouse embryonic stem cell self-renewal but instead functions as a barrier to somatic cell reprogramming. Here we show that DOT1L is required for spermatogonial stem cell self-renewal. Mice lacking DOT1L in the germ cells show a failure in the maintenance of spermatogonial stem cells without a block in spermatogenic cell differentiation and thus a progressive loss of germ cells, leading to a Sertoli-cell-only syndrome. Chemical inhibition of DOT1L in cultured stem cells reduces the spermatogonial stem cell activity after transplantation. RNA-seq analysis reveals downregulation of Hoxc cluster genes in DOT1L-inhibited spermatogonia stem cells. Single cell RNA-seq analysis demonstrates that inhibition of DOT1L sequesters spermatogonial stem cells in a primitive state and prevents them from transitioning to a progenitor state. These results identify a new function for DOT1L in adult stem cells and provides a paradigm for regulation of spermatogonial stem cell self-renewal. Self-renewal of spermatogonial stem cells is vital to life-long production of male gametes and thus fertility. However, the underlying mechanisms remain enigmatic. Here, we show that DOT1L, the sole H3K79 methyltransferase, is required for spermatogonial stem cell self-renewal. Mice lacking DOT1L fail to maintain spermatogonial stem cells, characterized by a sequential loss of germ cells from spermatogonia to spermatids and ultimately a Sertoli-cell-only syndrome. Inhibition of DOT1L reduces the stem cell activity after transplantation, prevents spermatogonial stem cells from transitioning to a progenitor state, and sequesters them in a primitive state. Furthermore, DOT1L promotes expression of the fate-determining HoxC transcription factors in spermatogonial stem cells. Our findings identify an essential function for DOT1L in adult stem cells and provide an epigenetic paradigm for regulation of spermatogonial stem cells.

Dataset Information

Histone methyltransferase DOT1L is essential for self-renewal of germline stem cells.

Publications

Histone methyltransferase DOT1L is essential for self-renewal of germline stem cells.

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