Pluripotency of a single spermatogonial stem cell in mice

Biology of Reproduction
Mito Kanatsu-ShinoharaTakashi Shinohara

Abstract

Although pluripotent stem cells were recently discovered in postnatal testis, attempts to analyze their developmental potential have led to conflicting claims that spermatogonial stem cells are pluripotent or that they lose spermatogenic potential after conversion into pluripotent stem cells. To examine this issue, we analyzed the developmental fate of a single spermatogonial stem cell that appeared during transfection experiments. After transfection of a neomycin-resistance gene into germline stem cells, we obtained an embryonic stem-like, multipotent germline stem cell line. Southern blot analysis revealed that the germline stem and multipotent germline stem clones have the same transgene integration pattern, demonstrating their identical origin. The two lines, however, have different DNA methylation patterns. The multipotent germline stem cells formed chimeras after blastocyst injection but did not produce sperm after germ cell transplantation, whereas the germline stem cells could produce only spermatozoa and did not differentiate into somatic cells. Interestingly, the germline stem cells expressed several transcription factors (Pou5f1, Sox2, Myc, and Klf4) required for reprogramming fibroblasts into a pluripotent state, su...Continue Reading

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Citations

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Methods Mentioned

BETA
gene trapping
transgenic
transfection
Chip
PCR
histone acetylation

Software Mentioned

COBRA
Affymetrix
Gene Chip

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