Distinct germline progenitor subsets defined through Tsc2-mTORC1 signaling

Robin M Hobbs, Hue Mai La, Juho-Antti Makela, Toshiyuki Kobayashi, Tetsuo Noda, Pier P Pandolfi

Research output: Contribution to journalArticleResearchpeer-review

28 Citations (Scopus)

Abstract

Adult tissue maintenance is often dependent on resident stem cells; however, the phenotypic and functional heterogeneity existing within this self-renewing population is poorly understood. Here, we define distinct subsets of undifferentiated spermatogonia (spermatogonial progenitor cells; SPCs) by differential response to hyperactivation of mTORC1, a key growth-promoting pathway. We find that conditional deletion of the mTORC1 inhibitor Tsc2 throughout the SPC pool using Vasa-Cre promotes differentiation at the expense of self-renewal and leads to germline degeneration. Surprisingly, Tsc2 ablation within a subset of SPCs using Stra8-Cre did not compromise SPC function. SPC activity also appeared unaffected by Amh-Cre-mediated Tsc2 deletion within somatic cells of the niche. Importantly, we find that differentiation-prone SPCs have elevated mTORC1 activity when compared to SPCs with high self-renewal potential. Moreover, SPCs insensitive to Tsc2 deletion are preferentially associated with mTORC1-active committed progenitor fractions. We therefore delineate SPC subsets based on differential mTORC1 activity and correlated sensitivity to Tsc2 deletion. We propose that mTORC1 is a key regulator of SPC fate and defines phenotypically distinct SPC subpopulations with varying propensities for self-renewal and differentiation.
Original languageEnglish
Pages (from-to)467 - 480
Number of pages14
JournalEMBO Reports
Volume16
Issue number4
DOIs
Publication statusPublished - 2015

Cite this

Hobbs, R. M., La, H. M., Makela, J-A., Kobayashi, T., Noda, T., & Pandolfi, P. P. (2015). Distinct germline progenitor subsets defined through Tsc2-mTORC1 signaling. EMBO Reports, 16(4), 467 - 480. https://doi.org/10.15252/embr.201439379
Hobbs, Robin M ; La, Hue Mai ; Makela, Juho-Antti ; Kobayashi, Toshiyuki ; Noda, Tetsuo ; Pandolfi, Pier P. / Distinct germline progenitor subsets defined through Tsc2-mTORC1 signaling. In: EMBO Reports. 2015 ; Vol. 16, No. 4. pp. 467 - 480.
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Hobbs, RM, La, HM, Makela, J-A, Kobayashi, T, Noda, T & Pandolfi, PP 2015, 'Distinct germline progenitor subsets defined through Tsc2-mTORC1 signaling', EMBO Reports, vol. 16, no. 4, pp. 467 - 480. https://doi.org/10.15252/embr.201439379

Distinct germline progenitor subsets defined through Tsc2-mTORC1 signaling. / Hobbs, Robin M; La, Hue Mai; Makela, Juho-Antti; Kobayashi, Toshiyuki; Noda, Tetsuo; Pandolfi, Pier P.

In: EMBO Reports, Vol. 16, No. 4, 2015, p. 467 - 480.

Research output: Contribution to journalArticleResearchpeer-review

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AU - La, Hue Mai

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