Unknown,Transcriptomics,Genomics,Proteomics

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Transcription profiling of mouse hair follicle cells reveals distinct self-renewal and differentiation phases in the niche of infrequently dividing stem cells

ABSTRACT: In homeostasis of adult vertebrate tissues, stem cells are thought to self-renew by infrequent and asymmetric divisions that generate another stem cell daughter and a progenitor daughter cell committed to differentiate. This model is based largely on in vivo invertebrate or in vitro mammal studies. Here we examine the dynamic behaviour of adult hair follicle stem cells in their normal setting by employing mice with repressible H2B-GFP expression to track cell divisions and Cre inducible mice to perform long-term single cell lineage tracing. We provide direct evidence for the infrequent stem cell division model in intact tissue. Moreover, we find that differentiation of progenitor cells occurs at different times and tissue locations than self-renewal of stem cells. Distinct fates of differentiation or self-renewal are assigned to individual cells in a temporal-spatial manner. We propose that large clusters of tissue stem cells behave as populations, whose maintenance involves unidirectional daughter-cell fate decisions. We used microarrays to expression profile the stem cell progeny generated at distinct differentiation and self-renewal stages. Experiment Overall Design: We employed double transgenic mice, K5tTA x pTRE-H2B-GFP in which an epithelial Keratin 5 (K5) promoter drove repressible histone H2B-GFP expression. Repression is achieved by feeding the mice doxycycline for a period of time (chase), when the H2B-GFP dilutes in cells by 2-fold at division. This allowed us to quantify precise proliferation history in vivo, from the amount of H2B-GFP fluorescence retained in cells after chase. After various chase periods we sacrificed mice at different ages corresponding to distinct phases of hair cycle. We isolated skin cell suspensions from these mice and stained them for surface expression of stem cell niche bulge(Bu) markers CD34 and alpha 6-integrin. Fluorescence-activated cell sorting (FACS) revealed histograms with distinct peaks of 2-fold median H2B-GFP intensity corresponding to distinct divisions. For microarray, we FACS sorted bulge(Bu) and non-bulge(NonBu) cells based cell surface marker staining and their proliferation history with H2B-GFP intensity, after two doxycycline chase schemes (Postnatal Day 18-PD21 or PD22-PD25), then extract total RNA from each cell fractions. For microarrays 5 ng of high quality RNA (Bioanalyzer, Agilent) were amplified (Ovation Amplification; Nugene) in the Cornell Microarray Core Facility. GeneChip IVT labelling was followed by Gene Chip MOE 430 2.0 hybridization, GeneArray 3000 scanning, GCOS generation of present calls and signal values (Affymetrix).

ORGANISM(S): Mus musculus

SUBMITTER: Tudorita Tumbar

PROVIDER: E-GEOD-16516 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:RNA-seq transcriptome analysis of C. elegans germlines that inherited only paternal chromosomes (non-Mendelian inheritance, 'red-head worms') and the germlines of their offspring ('offspring of red-head worms') vs. germlines that inherited both maternal and paternal chromosomes (Mendelian inheritance, HBR1280 control). Given that epigenetic marking of sperm chromosomes is faithfully transmitted through embryo cell divisions, and that sperm epigenetic marking is important in offspring, we tested if sperm epigenetic marking alone is sufficient for proper development of the germline in offspring. We utilized a mutant that, during the first embryonic division, delivers the sperm genome to the daughter cell that generates the germline and the oocyte genome to the other daughter cell (Besseling & Bringmann, 2016). This mutant over-expresses GPR-1, a protein involved in regulation of kinetochore pulling forces. GPR-1 over-expression results in excessive pulling forces, causing the paternal and maternal pronuclei to inappropriately move to opposite poles of the 1-cell embryo instead of merging in the center of the embryo. In this mutant background, ~60% of offspring undergo atypical chromosome segregation, generating mosaic embryos whose germlines are derived entirely from sperm chromosomes (Besseling & Bringmann, 2016). To track the parental genomes, differentially tagged histone transgenes were used: a GFP-tagged histone H2B encoded in the sperm genome, and a TdTomato-tagged histone H2B encoded in the oocyte genome. The mosaic embryos whose germline inherited only sperm chromosomes (‘red-head' worms) develop into fertile adults with a normal brood size, similar to control worms, in which the germline inherited both sperm and oocyte chromosomes. RNA-seq analysis demonstrated that the germline transcriptome of ‘red-head’ worms and their offspring show few (<80 genes) and minor changes compared to control worms. These findings demonstrate that epigenetic information provided by sperm can guide proper germ cell development.

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Transcription profiling of mouse hair follicle cells reveals distinct self-renewal and differentiation phases in the niche of infrequently dividing stem cells

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