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Characterization of Embryonic Skin Transcriptome in Anser cygnoides at Three Feather Follicles Developmental Stages. G3-GENES GENOMES GENETICS 2020; 10:443-454. [PMID: 31792007 PMCID: PMC7003092 DOI: 10.1534/g3.119.400875] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
In order to enrich the Anser cygnoides genome and identify the gene expression profiles of primary and secondary feather follicles development, de novo transcriptome assembly of skin tissues was established by analyzing three developmental stages at embryonic day 14, 18, and 28 (E14, E18, E28). Sequencing output generated 436,730,608 clean reads from nine libraries and de novo assembled into 56,301 unigenes. There were 2,298, 9,423 and 12,559 unigenes showing differential expression in three stages respectively. Furthermore, differentially expressed genes (DEGs) were functionally classified according to genes ontology (GO), Kyoto Encyclopedia of Genes and Genomes (KEGG), and series-cluster analysis. Relevant specific GO terms such as epithelium development, regulation of keratinocyte proliferation, morphogenesis of an epithelium were identified. In all, 15,144 DEGs were clustered into eight profiles with distinct expression patterns and 2,424 DEGs were assigned to 198 KEGG pathways. Skin development related pathways (mitogen-activated protein kinase signaling pathway, extra-cellular matrix -receptor interaction, Wingless-type signaling pathway) and genes (delta like canonical Notch ligand 1, fibroblast growth factor 2, Snail family transcriptional repressor 2, bone morphogenetic protein 6, polo like kinase 1) were identified, and eight DEGs were selected to verify the reliability of transcriptome results by real-time quantitative PCR. The findings of this study will provide the key insights into the complicated molecular mechanism and breeding techniques underlying the developmental characteristics of skin and feather follicles in Anser cygnoides.
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IRF2 is a master regulator of human keratinocyte stem cell fate. Nat Commun 2019; 10:4676. [PMID: 31611556 PMCID: PMC6791852 DOI: 10.1038/s41467-019-12559-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2018] [Accepted: 09/14/2019] [Indexed: 12/25/2022] Open
Abstract
Resident adult epithelial stem cells maintain tissue homeostasis by balancing self-renewal and differentiation. The stem cell potential of human epidermal keratinocytes is retained in vitro but lost over time suggesting extrinsic and intrinsic regulation. Transcription factor-controlled regulatory circuitries govern cell identity, are sufficient to induce pluripotency and transdifferentiate cells. We investigate whether transcriptional circuitry also governs phenotypic changes within a given cell type by comparing human primary keratinocytes with intrinsically high versus low stem cell potential. Using integrated chromatin and transcriptional profiling, we implicate IRF2 as antagonistic to stemness and show that it binds and regulates active cis-regulatory elements at interferon response and antigen presentation genes. CRISPR-KD of IRF2 in keratinocytes with low stem cell potential increases self-renewal, migration and epidermis formation. These data demonstrate that transcription factor regulatory circuitries, in addition to maintaining cell identity, control plasticity within cell types and offer potential for therapeutic modulation of cell function. Epidermal homeostasis requires long term stem cell function. Here, the authors apply transcriptional circuitry analysis based on integrated epigenomic profiling of primary human keratinocytes with high and low stem cell function to identify IRF2 as a negative regulator of stemness.
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Noutsou M, Li J, Ling J, Jones J, Wang Y, Chen Y, Sen GL. The Cohesin Complex Is Necessary for Epidermal Progenitor Cell Function through Maintenance of Self-Renewal Genes. Cell Rep 2017; 20:3005-3013. [PMID: 28954219 PMCID: PMC5683098 DOI: 10.1016/j.celrep.2017.09.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Revised: 07/27/2017] [Accepted: 08/31/2017] [Indexed: 01/24/2023] Open
Abstract
Adult stem and progenitor cells are critical for replenishing lost tissue due to injury or normal turnover. How these cells maintain self-renewal and sustain the tissue they populate are areas of active investigation. Here, we show that the cohesin complex, which has previously been implicated in regulating chromosome segregation and gene expression, is necessary to promote epidermal stem and progenitor cell self-renewal through cell-autonomous mechanisms. Cohesin binds to genomic sites associated with open chromatin, including DNase-I-hypersensitive sites, RNA polymerase II, and histone marks such as H3K27ac and H3K4me3. Reduced cohesin expression results in spontaneous epidermal differentiation due to loss of open chromatin structure and expression of key self-renewal genes. Our results demonstrate a prominent role for cohesin in modulating chromatin structure to allow for enforcement of a stem and progenitor cell gene expression program.
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Affiliation(s)
- Maria Noutsou
- Department of Dermatology, UCSD Stem Cell Program, University of California, San Diego, La Jolla, CA 92093-0869, USA; Department of Cellular and Molecular Medicine, UCSD Stem Cell Program, University of California, San Diego, La Jolla, CA 92093-0869, USA
| | - Jingting Li
- Department of Dermatology, UCSD Stem Cell Program, University of California, San Diego, La Jolla, CA 92093-0869, USA; Department of Cellular and Molecular Medicine, UCSD Stem Cell Program, University of California, San Diego, La Jolla, CA 92093-0869, USA
| | - Ji Ling
- Department of Dermatology, UCSD Stem Cell Program, University of California, San Diego, La Jolla, CA 92093-0869, USA; Department of Cellular and Molecular Medicine, UCSD Stem Cell Program, University of California, San Diego, La Jolla, CA 92093-0869, USA
| | - Jackson Jones
- Department of Dermatology, UCSD Stem Cell Program, University of California, San Diego, La Jolla, CA 92093-0869, USA; Department of Cellular and Molecular Medicine, UCSD Stem Cell Program, University of California, San Diego, La Jolla, CA 92093-0869, USA
| | - Ying Wang
- Department of Dermatology, UCSD Stem Cell Program, University of California, San Diego, La Jolla, CA 92093-0869, USA; Department of Cellular and Molecular Medicine, UCSD Stem Cell Program, University of California, San Diego, La Jolla, CA 92093-0869, USA
| | - Yifang Chen
- Department of Dermatology, UCSD Stem Cell Program, University of California, San Diego, La Jolla, CA 92093-0869, USA; Department of Cellular and Molecular Medicine, UCSD Stem Cell Program, University of California, San Diego, La Jolla, CA 92093-0869, USA
| | - George L Sen
- Department of Dermatology, UCSD Stem Cell Program, University of California, San Diego, La Jolla, CA 92093-0869, USA; Department of Cellular and Molecular Medicine, UCSD Stem Cell Program, University of California, San Diego, La Jolla, CA 92093-0869, USA.
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Huang X, Pan Y, Cao D, Fang S, Huang K, Chen J, Chen A. UVA-induced upregulation of progerin suppresses 53BP1‑mediated NHEJ DSB repair in human keratinocytes via progerin-lamin A complex formation. Oncol Rep 2017; 37:3617-3624. [PMID: 28498430 DOI: 10.3892/or.2017.5603] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Accepted: 12/16/2016] [Indexed: 11/06/2022] Open
Abstract
Ultraviolet (UV) radiation is the primary risk factor underlying photoaging and photocarcinogenesis. Mounting research has focused on the role of DNA damage response pathways in UV-induced double-strand break (DSB) repair. In the present study, we hypothesized that UVA-induced aberrant progerin upregulation may adversely affect p53-binding protein 1 (53BP1)-mediated non-homologous end joining (NHE) DSB repair in human keratinocytes. Basal cell carcinoma (BCC) tumors and matching normal skin tissue were sampled (n=200) to investigate whether human keratinocytes display dysregulated progerin expression as a function of advancing age and BCC status. Newborn foreskin samples (n=9) were used as a source for primary keratinocyte cultures. We investigated the effects of UVA radiation on progerin and lamin A expression as well as the effects of the silencing of progerin on lamin A protein expression in UVA-irradiated keratinocytes. We investigated whether blocking progerin‑lamin A interaction was able to rescue UVA-induced lamin A protein downregulation, 53BP1 downregulation and 53BP1-mediated NHEJ DSB repair activity. Progerin upregulation in adult keratinocytes was associated with advancing age, not BCC status. In vitro, UVA exposure significantly upregulated progerin expression by favoring alternative LMNA gene transcript splicing. UVA exposure significantly downregulated free (unbound) lamin A protein levels via progerin-lamin A complex formation. UVA exposure significantly decreased 53BP1 protein levels via enhanced progerin-lamin A complex formation. UVA-induced progerin‑lamin A complex formation was largely responsible for suppressing 53BP1-mediated NHEJ DSB repair activity. The present study is the first to demonstrate that UVA-induced progerin upregulation adversely affects 53BP1-mediated NHEJ DSB repair in human keratinocytes via progerin‑lamin A complex formation.
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Affiliation(s)
- Xin Huang
- Prescriptions Department, College of Traditional Chinese Medicine, Chongqing Medical University, Yuzhong, Chongqing, P.R. China
| | - Yun Pan
- Department of Dermatology, The First Affiliated Hospital of Chongqing Medical University, Yuzhong, Chongqing, P.R. China
| | - Di Cao
- Department of Dermatology, The First Affiliated Hospital of Chongqing Medical University, Yuzhong, Chongqing, P.R. China
| | - Sheng Fang
- Department of Dermatology, The First Affiliated Hospital of Chongqing Medical University, Yuzhong, Chongqing, P.R. China
| | - Kun Huang
- Department of Dermatology, The First Affiliated Hospital of Chongqing Medical University, Yuzhong, Chongqing, P.R. China
| | - Jin Chen
- Department of Dermatology, The First Affiliated Hospital of Chongqing Medical University, Yuzhong, Chongqing, P.R. China
| | - Aijun Chen
- Department of Dermatology, The First Affiliated Hospital of Chongqing Medical University, Yuzhong, Chongqing, P.R. China
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Li J, Sen GL. Post-Transcriptional Mechanisms Regulating Epidermal Stem and Progenitor Cell Self-Renewal and Differentiation. J Invest Dermatol 2016; 136:746-752. [DOI: 10.1016/j.jid.2015.12.030] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2015] [Revised: 11/17/2015] [Accepted: 11/30/2015] [Indexed: 01/19/2023]
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Li J, Sen GL. Generation of Genetically Modified Organotypic Skin Cultures Using Devitalized Human Dermis. J Vis Exp 2015:e53280. [PMID: 26709715 DOI: 10.3791/53280] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Organotypic cultures allow the reconstitution of a 3D environment critical for cell-cell contact and cell-matrix interactions which mimics the function and physiology of their in vivo tissue counterparts. This is exemplified by organotypic skin cultures which faithfully recapitulates the epidermal differentiation and stratification program. Primary human epidermal keratinocytes are genetically manipulable through retroviruses where genes can be easily overexpressed or knocked down. These genetically modified keratinocytes can then be used to regenerate human epidermis in organotypic skin cultures providing a powerful model to study genetic pathways impacting epidermal growth, differentiation, and disease progression. The protocols presented here describe methods to prepare devitalized human dermis as well as to genetically manipulate primary human keratinocytes in order to generate organotypic skin cultures. Regenerated human skin can be used in downstream applications such as gene expression profiling, immunostaining, and chromatin immunoprecipitations followed by high throughput sequencing. Thus, generation of these genetically modified organotypic skin cultures will allow the determination of genes that are critical for maintaining skin homeostasis.
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Affiliation(s)
- Jingting Li
- Department of Dermatology, UCSD Stem Cell Program, University of California, San Diego; Department of Cellular and Molecular Medicine, UCSD Stem Cell Program, University of California, San Diego
| | - George L Sen
- Department of Dermatology, UCSD Stem Cell Program, University of California, San Diego; Department of Cellular and Molecular Medicine, UCSD Stem Cell Program, University of California, San Diego;
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Wang Y, Arribas-Layton M, Chen Y, Lykke-Andersen J, Sen GL. DDX6 Orchestrates Mammalian Progenitor Function through the mRNA Degradation and Translation Pathways. Mol Cell 2015; 60:118-30. [PMID: 26412305 DOI: 10.1016/j.molcel.2015.08.014] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2015] [Revised: 06/11/2015] [Accepted: 08/18/2015] [Indexed: 12/26/2022]
Abstract
In adult tissues, stem and progenitor cells must balance proliferation and differentiation to maintain homeostasis. How this is done is unclear. Here, we show that the DEAD box RNA helicase, DDX6 is necessary for maintaining adult progenitor cell function. DDX6 loss results in premature differentiation and decreased proliferation of epidermal progenitor cells. To maintain self-renewal, DDX6 associates with YBX1 to bind the stem loops found in the 3' UTRs of regulators of proliferation/self-renewal (CDK1, EZH2) and recruit them to EIF4E to facilitate their translation. To prevent premature differentiation of progenitor cells, DDX6 regulates the 5' UTR of differentiation inducing transcription factor, KLF4 and degrades its transcripts through association with mRNA degradation proteins. Our results demonstrate that progenitor function is maintained by DDX6 complexes through two distinct pathways that include the degradation of differentiation-inducing transcripts and by promoting the translation of self-renewal and proliferation mRNAs.
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Affiliation(s)
- Ying Wang
- Department of Dermatology, University of California, San Diego, La Jolla, CA 92093-0869, USA; Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, CA 92093-0869, USA; UCSD Stem Cell Program, University of California, San Diego, La Jolla, CA 92093-0869, USA
| | - Marc Arribas-Layton
- Division of Biological Sciences, University of California, San Diego, La Jolla, CA 92093-0869, USA
| | - Yifang Chen
- Department of Dermatology, University of California, San Diego, La Jolla, CA 92093-0869, USA; Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, CA 92093-0869, USA; UCSD Stem Cell Program, University of California, San Diego, La Jolla, CA 92093-0869, USA
| | - Jens Lykke-Andersen
- Division of Biological Sciences, University of California, San Diego, La Jolla, CA 92093-0869, USA
| | - George L Sen
- Department of Dermatology, University of California, San Diego, La Jolla, CA 92093-0869, USA; Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, CA 92093-0869, USA; UCSD Stem Cell Program, University of California, San Diego, La Jolla, CA 92093-0869, USA.
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