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Spatial Transcriptomic Profiling of Male Germ Cells from Control and Cbfb cKO mice

ABSTRACT: Spatial Transcriptomic Profiling of Male Germ Cells from Control and Cbfb cKO mice

PROVIDER: PRJNA1023629 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR26274100_1.fastq.gz	Fastqsanger.gz
	SRR26274100_2.fastq.gz	Fastqsanger.gz
	SRR26274101_1.fastq.gz	Fastqsanger.gz
	SRR26274101_2.fastq.gz	Fastqsanger.gz
	SRR26274102_1.fastq.gz	Fastqsanger.gz

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Spatial Transcriptomic Profiling of Male Germ Cells from Control and Cbfb cKO mice

Project description:Much of the framework for spermatogenesis is established postnatally before sexual maturation. To evaluate the role of core-binding factor subunit β (CBFβ) in prepubertal male germline development, we generated male mice with conditional knockout of Cbfb using Blimp1-Cre (denoted Blimp1-Cbfb cKO). Outcomes from phenotype analysis revealed that Blimp1-Cbfb cKO males were completely infertile and experienced rapid germline degeneration prior to puberty. To evaluate the pathways downstream of Cbfb that coincide with this degeneration, we conducted spatial transcriptomics of heterozygous control and Blimp1-Cbfb cKO testes at postnatal days 6 (P6) and 21 (P21) and used fluorescence immunostaining to identify and capture cell-type specific transcriptomic signatures. Collectively, our analysis revealed central roles of CBFβ in maintenance, differentiation, and cell cycle checkpoint regulation within the prepubertal male germline.

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The NMD endonuclease SMG6 co-operates with the piRNA pathway in germ granules to shape the male germ cell transcriptome

Project description:Nonsense-mediated RNA decay (NMD) is a conserved RNA turnover pathway. Here we report that the sole endonuclease in the NMD pathway, SMG6, is essential for the male germline. Germ-cell conditional knockout (cKO) of Smg6 causes complete arrest of spermatogenesis at the early haploid cell stage. Smg6-cKO round spermatids accumulate NMD target mRNAs with long 3’ untranslated regions (UTRs) and fail to eliminate transcripts normally expressed during meiosis, the previous step in spermatogenesis. SMG6 and PIWI-interacting (pi) RNA pathway components are highly enriched in the chromatoid body (CB), a specialized cytoplasmic granule in male germ cells. This led to the intriguing possibility that the CB is a site where SMG6 and the piRNA pathway co-operate to regulate RNA metabolism. Several findings supported this hypothesis: (i) SMG6 and the piRNA-binding protein PIWIL1 have almost identical temporal expression and localization patterns, (ii) SMG6 and PIWIL1 physically interact, (iii) scores of genes upregulated in Smg6-cKO round spermatids overlap with those upregulated in Piwil1-KO round spermatids, and (iv) the phenotypic defects caused by SMG6 loss phenocopies the defects caused by PIWIL1 loss. Together, our results demonstrate that SMG6 is an essential regulator of the male germline transcriptome and highlight the CB as a molecular platform coordinating RNA regulatory pathways to control sperm production and fertility.

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