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Temporal-spatial Establishment of Initial Niche for the Primary Spermatogonial Stem Cell formation is Determined by an ARID4B Regulatory Network (RNA-Seq)

ABSTRACT: The primary spermatogonial stem cells (SSCs), which arise from gonocytes during neonatal development, serve as a foundational self-renewing reservoir to ensure continuous production of spermatozoa throughout adulthood. The transformation of gonocytes into SSCs takes place in a niche established by Sertoli cells. To date, the factors that guide Sertoli cells to establish the initial stem cell niche remain largely unknown. Using Sertoli cell-specific Arid4b knockout (Arid4bSCKO) mice, we demonstrated that ablation of ARID4B resulted in failure to establish a niche for the SSC formation. We performed RNA-Seq analysis to examine the gene expression profile of the Arid4bSCKO testes in comparison with that of control testes.

ORGANISM(S): Mus musculus

PROVIDER: GSE84804 | GEO | 2017/03/27

SECONDARY ACCESSION(S): PRJNA331163

REPOSITORIES: GEO

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Project description:In the adult mammalian testis, spermatogenic differentiation starts from a minute population of spermatogonial stem cells (SSCs). SSCs are generated after birth from the fetal gonocytes, themselves derived from the primordial germ cells (PGCs), which are specified during the first days after implantation. Transcriptome profiling of purified preparations evidenced the preferential accumulation in SSCs of transcripts of PU.1 (Sfpi1), a regulatory gene previously identified in hematopoietic progenitors. In situ immunolabeling and RNA determination showed a complex pattern of expression in the adult testis, first in SSCs and early spermatogonia followed by de novo expression in pachytene spermatocytes. Spermatogenesis in a null mutant (PU.1(G/G)) was arrested at the prenatal stage, with reduced numbers of gonocytes owing to a defect in proliferation already noticeable at E12.5. Transcripts of several germinal markers, including vasa (Mvh, Ddx4), Oct4 (Pou5f1), Dazl and Taf4b, were detected, whereas stella (PGC7, Dppa3) was not. Germ cells of PU.1(G/G) newborn testes grafted in nude mice did not initiate the postnatal replicative stage, whereas grafts of their wild-type littermates underwent complete spermatogenesis. During embryonic development, PU.1 transcription was initiated as early as the blastocyst stage, with a generalized expression at E6.5 in the embryonic ectoderm. PU.1 therefore appears to play a determinant role in at least two distinct lineages and, given its wide range of expression, possibly in other stem cells. Experiment Overall Design: Our starting point was the establishment of a transcriptome profile of purified preparations of SSCs, on the assumption that crucial genes would appear among those expressed at elevated levels in the stem cells. Work on adult SSCs is made difficult by their small number. We previously reported an efficient procedure, in which a truncated version of the Stra8 promoter is used to express in SSCs a neutral heterologous surface protein including two domains of the human CD4 antigen (huCD4) (Giuili et al., 2002). Once fractionated by immunomagnetic sorting, the huCD4-positive fraction is homogeneous for the expression of known SSC markers and highly efficient in the colonization of a sterile recipient.

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Temporal-spatial Establishment of Initial Niche for the Primary Spermatogonial Stem Cell formation is Determined by an ARID4B Regulatory Network (RNA-Seq)

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