Functional Investigations of Type 1 Diabetes Candidate Genes in Cellular and Animal Models

A special issue of Genes (ISSN 2073-4425). This special issue belongs to the section "Human Genomics and Genetic Diseases".

Deadline for manuscript submissions: closed (1 September 2021) | Viewed by 2889

Special Issue Editors


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Guest Editor
Steno Diabetes Center Copenhagen & University of Copenhagen, 1165 København, Denmark
Interests: type 1 diabetes pathogenesis; β-cell and islet biology; cytokines and inflammation; signal transduction; genetics; incretins; apoptosis
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Guest Editor
Translational Type 1 Diabetes Research Steno Diabetes Center Copenhagen and University of Copenhagen DK-2820 Gentofte, Denmark
Interests: type 1 diabetes pathogenesis; genetics; genomics; biomarkers; systems biology

Special Issue Information

Dear Colleagues,

Through the remarkable advancement in human genetics in recent decades, multiple loci that affect the risk of developing T1D have been discovered. For most of the T1D-associated loci, however, the causal candidate genes and variants linked to disease risk remain undefined. To obtain a better understanding of the molecular basis of T1D genetics, it is important to identify the specific disease-promoting genes and variants in the risk loci and to functionally evaluate them in relevant biological model systems.

In this Special Issue, we welcome reviews, new methods, and original articles covering many aspects of functional T1D candidate gene studies. These include, but are not limited to, computational studies to pinpoint causal candidate genes, expressional regulation of T1D loci-associated genes in relevant tissues (such as immune cells and pancreatic islets/b-cells), the impact of candidate genes on immune cell function, the impact of candidate genes on b-cell function and apoptosis (e.g. loss- and gain-of-function studies), and functional studies of candidate genes in animal models (such as knockout mice). We look forward to your contributions.

Dr. Joachim Størling
Prof. Flemming Pociot
Guest Editors

Manuscript Submission Information

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Keywords

  • Type 1 diabetes (T1D) 
  • Genetics 
  • Candidate gene 
  • Single nucleotide polymophism (SNP) 
  • Genome-wide association study (GWAS) 
  • β-cells 
  • Pancreatic islets 
  • Immune cells 
  • Apoptosis

Published Papers (1 paper)

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Research

15 pages, 2002 KiB  
Article
Cathepsin C Regulates Cytokine-Induced Apoptosis in β-Cell Model Systems
by Tina Fløyel, Caroline Frørup, Joachim Størling and Flemming Pociot
Genes 2021, 12(11), 1694; https://0-doi-org.brum.beds.ac.uk/10.3390/genes12111694 - 25 Oct 2021
Cited by 5 | Viewed by 2265
Abstract
Emerging evidence suggests that several of the lysosomal cathepsin proteases are genetically associated with type 1 diabetes (T1D) and participate in immune-mediated destruction of the pancreatic β cells. We previously reported that the T1D candidate gene cathepsin H is downregulated by pro-inflammatory cytokines [...] Read more.
Emerging evidence suggests that several of the lysosomal cathepsin proteases are genetically associated with type 1 diabetes (T1D) and participate in immune-mediated destruction of the pancreatic β cells. We previously reported that the T1D candidate gene cathepsin H is downregulated by pro-inflammatory cytokines in human pancreatic islets and regulates β-cell function, apoptosis, and disease progression in children with new-onset T1D. In the present study, the objective was to investigate the expression patterns of all 15 known cathepsins in β-cell model systems and examine their role in the regulation of cytokine-induced apoptosis. Real-time qPCR screening of the cathepsins in human islets, 1.1B4 and INS-1E β-cell models identified several cathepsins that were expressed and regulated by pro-inflammatory cytokines. Using small interfering RNAs to knock down (KD) the cytokine-regulated cathepsins, we identified an anti-apoptotic function of cathepsin C as KD increased cytokine-induced apoptosis. KD of cathepsin C correlated with increased phosphorylation of JNK and p38 mitogen-activated protein kinases, and elevated chemokine CXCL10/IP-10 expression. This study suggests that cathepsin C is a modulator of β-cell survival, and that immune modulation of cathepsin expression in islets may contribute to immune-mediated β-cell destruction in T1D. Full article
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