L(1)10Bb serves as a conservative determinant for soma-germline communications via cellular non-autonomous effects within the testicular stem cell niche

• Published in: Molecular and cellular endocrinology 2024-09, Vol.591, p.112278, Article 112278
• Main Authors: He, Lei, Sun, Feiteng, Wu, Yunhao, Li, Zhiran, Fu, Yangbo, Huang, Qiuru, Li, Jiaxin, Wang, Zihan, Cai, Jiaying, Feng, Chenrui, Deng, Xiaonan, Gu, Han, He, Xuxin, Yu, Jun, Sun, Fei
• Format: Article
• Language: English
• Subjects: Cyst stem cell; Differentiation; Germline stem cell; Maintenance; Stem cell niche
• ISSN: 0303-7207; 1872-8057; 1872-8057
• DOI: 10.1016/j.mce.2024.112278

The testicular stem cell niche is the central regulator of spermatogenesis in Drosophila melanogaster. However, the underlying regulatory mechanisms are unclear. This study demonstrated the crucial role of lethal (1) 10Bb [l(1)10Bb] in regulating the testicular stem cell niche. Dysfunction of l(1)10Bb in early-stage cyst cells led to male fertility disorders and compromised cyst stem cell maintenance. Moreover, the dysfunction of l(1)10Bb in early-stage cyst cells exerted non-autonomous effects on germline stem cell differentiation, independently of hub signals. Notably, our study highlights the rescue of testicular defects through ectopic expression of L(1)10Bb and the human homologous protein BUD31 homolog (BUD31). In addition, l(1)10Bb dysfunction in early-stage cyst cells downregulated the expression of spliceosome subunits in the Sm and the precursor RNA processing complexes. Collectively, our findings established l(1)10Bb as a pivotal factor in the modulation of Drosophila soma-germline communications within the testicular stem cell niche. •L(1)10Bb is a key regulator for testicular stem cell niche.•CySC-derived l(1)10Bb is essential for maintaining CySCs.•L(1)10Bb non-autonomously affects GSC differentiation.•L(1)10Bb/BUD31 are sufficient to rescue l(1)10Bb dysfunction in niche.