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https://www.readbyqxmd.com/read/28684273/chicken-dna-virus-sensor-ddx41-activates-ifn-%C3%AE-signaling-pathway-dependent-on-sting
#1
Yuqiang Cheng, Yunxia Liu, Yingying Wang, Qiaona Niu, Quanxin Gao, Qiang Fu, Jingjiao Ma, Hengan Wang, Yaxian Yan, Chan Ding, Jianhe Sun
The recognition of pathogenic DNA is important to the initiation of antiviral responses. Here, we report the identification of the first avian DEAD (Asp-Glu-Ala-Asp) box polypeptide 41 (DDX41), an important DNA sensor, in chicken cells. In our study, we confirmed that chDDX41 is not an interferon-inducible gene. Knockdown of chDDX41 expression by shRNA blocked the ability of DF-1 cells to mount an IFN-β response to DNA and associated viruses. ChDDX41 mRNAs could be upregulated by double-stranded DNA (dsDNA) analogue poly(dA:dT), but not by double-stranded RNA (dsRNA) analogue poly(I:C)...
July 3, 2017: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/28637623/ddx41-related-myeloid-neoplasia
#2
REVIEW
Jaroslaw P Maciejewski, Richard A Padgett, Anna L Brown, Carsten Müller-Tidow
While early presentation of familial leukemia syndromes is typical, long disease anticipation may mask cases of familial traits in seemingly spontaneous disease. Germline mutations in DDX41 gene have been discovered in several leukemia families, as well as in mostly adult patients with seemingly spontaneous disease but having strong family histories of myeloid neoplasia. As with other familial genes, DDX41 mutation carriers can develop neoplasia through acquisition of another somatic mutation, thereby affecting both DDX41 alleles...
April 2017: Seminars in Hematology
https://www.readbyqxmd.com/read/28602976/sting-signaling-in-tumorigenesis-and-cancer-therapy-a-friend-or-foe
#3
Liangmei He, Xiaomei Xiao, Xi Yang, Zixiang Zhang, Longhuo Wu, Zhiping Liu
Stimulator of interferon genes (STING) is a DNA sensor and an important cytoplasmic adaptor for other DNA sensors, such as Z-DNA binding protein 1 (DAI), DEAD-box helicase 41 (DDX41), and interferon-γ-inducible protein 16 (IFI16). The activation of STING signaling leads to the production of type I interferons and some other pro-inflammatory cytokines, which are critical for host defense against viral infection. Recent accumulating evidences suggest that STING is also involved in tumor development. However, the role of STING signaling in tumorigenesis is complicated, and a comprehensive review is still lacking...
August 28, 2017: Cancer Letters
https://www.readbyqxmd.com/read/28547672/myeloid-neoplasms-with-germline-ddx41-mutation
#4
REVIEW
Jesse J C Cheah, Christopher N Hahn, Devendra K Hiwase, Hamish S Scott, Anna L Brown
Recently, DDX41 mutations have been identified both as germline and acquired somatic mutations in families with multiple cases of late-onset myelodysplastic syndrome (MDS) and/or acute myeloid leukemia. The majority of germline mutations are frameshift mutations suggesting loss of function with DDX41 acting as a tumor suppressor, and there is a common somatic missense mutation found in a majority of germline mutated tumors. Clinically, DDX41 mutations lead to development of high-risk MDS at an age similar to that observed in sporadic cohorts, presenting a unique challenge to hematologists in recognizing the familial context...
August 2017: International Journal of Hematology
https://www.readbyqxmd.com/read/28426938/high-throughput-screening-to-identify-inhibitors-of-dead-box-helicase-ddx41
#5
Mariko Yoneyama-Hirozane, Mitsuyo Kondo, Shin-Ichi Matsumoto, Akiko Morikawa-Oki, Daisuke Morishita, Atsushi Nakanishi, Tomohiro Kawamoto, Masaharu Nakayama
The human DEAD (Asp-Glu-Ala-Asp) box protein DDX41, a member of the DEXDc helicase family, has nucleic acid-dependent ATPase and RNA and DNA translocase and unwinding activities. DDX41 is affected by somatic mutations in sporadic cases of myeloid neoplasms as well as in a biallelic fashion in 50% of patients with germline DDX41 mutations. The R525H mutation in DDX41 is thought to play important roles in the development of hereditary myelodysplastic syndrome and acute myelocytic leukemia. In this study, human DDX41 and its R525H mutant (R525H) were expressed in Escherichia coli and purified...
April 1, 2017: SLAS Discovery
https://www.readbyqxmd.com/read/28357685/familial-acute-myeloid-leukemia-and-myelodysplasia-in-hungary
#6
Attila Péter Király, Krisztián Kállay, Ambrus Gángó, Ádám Kellner, Miklós Egyed, Anita Szőke, Richárd Kiss, István Vályi-Nagy, Judit Csomor, András Matolcsy, Csaba Bödör
Although genetic predisposition to haematological malignancies has long been known, genetic testing is not yet the part of the routine diagnostics. In the last ten years, next generation sequencing based studies identified novel germline mutations in the background of familial aggregation of certain haematologic disorders including myelodysplastic syndromes (MDS) and acute myeloid leukaemia (AML). This is supported by the fact that the myeloid neoplasms with genetic predisposition represent a new category in the revised 2016 World Health Organization classification...
March 29, 2017: Pathology Oncology Research: POR
https://www.readbyqxmd.com/read/28348086/the-dead-box-rna-helicase-ddx41-is-a-novel-repressor-of-p21-waf1-cip1-mrna-translation
#7
Dominik Peters, Claudia Radine, Alina Reese, Wilfried Budach, Dennis Sohn, Reiner U Jänicke
The cyclin-dependent kinase inhibitor p21 is an important player in stress pathways exhibiting both tumor-suppressive and oncogenic functions. Thus, expression of p21 has to be tightly controlled, which is achieved by numerous mechanisms at the transcriptional, translational, and posttranslational level. Performing immunoprecipitation of bromouridine-labeled p21 mRNAs that had been incubated before with cytoplasmic extracts of untreated HCT116 colon carcinoma cells, we identified the DEAD-box RNA helicase DDX41 as a novel regulator of p21 expression...
May 19, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28275134/the-complement-anaphylatoxins-c5a-and-c3a-suppress-ifn-%C3%AE-production-in-response-to-listeria-monocytogenes-by-inhibition-of-the-cyclic-dinucleotide-activated-cytosolic-surveillance-pathway
#8
Stacey L Mueller-Ortiz, Daniel G Calame, Nancy Shenoi, Yi-Dong Li, Rick A Wetsel
Listeria monocytogenes is an intracellular Gram-positive bacterium that induces expression of type I IFNs (IFN-α/IFN-β) during infection. These cytokines are detrimental to the host during infection by priming leukocytes to undergo L. monocytogenes-mediated apoptosis. Our previous studies showed that C5aR1(-/-) and C3aR(-/-) mice are highly susceptible to L. monocytogenes infection as a result of increased IFN-β-mediated apoptosis of major leukocyte cell populations, including CD4(+) and CD8(+) T cells. However, the mechanisms by which C3a and C5a modulate IFN-β expression during L...
April 15, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28194039/donor-cell-leukemia-arising-from-preleukemic-clones-with-a-novel-germline-ddx41-mutation-after-allogenic-hematopoietic-stem-cell-transplantation
#9
S Kobayashi, A Kobayashi, Y Osawa, S Nagao, K Takano, Y Okada, N Tachi, M Teramoto, T Kawamura, T Horiuchi, S Kato, T Maekawa, T Yamamura, J Watanabe, Y Harada, H Harada, K Sato, F Kimura
No abstract text is available yet for this article.
April 2017: Leukemia: Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K
https://www.readbyqxmd.com/read/28126619/enhancement-of-glycoprotein-based-dna-vaccine-for-viral-hemorrhagic-septicemia-virus-vhsv-via-addition-of-the-molecular-adjuvant-ddx41
#10
Jassy Mary S Lazarte, Young Rim Kim, Jung Seok Lee, Se Pyeong Im, Si Won Kim, Jae Wook Jung, Jaesung Kim, Woo Jai Lee, Tae Sung Jung
The use of molecular adjuvants to improve the immunogenicity of DNA vaccines has been thoroughly studied in recent years. Glycoprotein (G)-based DNA vaccines had been proven to be effective in combating infection against Rhabdovirus (especially infectious hematopoietic necrosis virus, IHNV) in salmonids. DDX41 is a helicase known to induce antiviral and inflammatory responses by inducing a type I IFN innate immune response. To gain more information regarding G-based DNA vaccines in olive flounder (Paralicthys olivaceus), we tried to develop a more efficient G-based DNA vaccine by adding a molecular adjuvant, DDX41...
March 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28031539/recurrent-genetic-defects-on-chromosome-5q-in-myeloid-neoplasms
#11
Naoko Hosono, Hideki Makishima, Reda Mahfouz, Bartlomiej Przychodzen, Kenichi Yoshida, Andres Jerez, Thomas LaFramboise, Chantana Polprasert, Michael J Clemente, Yuichi Shiraishi, Kenichi Chiba, Hiroko Tanaka, Satoru Miyano, Masashi Sanada, Edward Cui, Amit K Verma, Michael A McDevitt, Alan F List, Yogen Saunthararajah, Mikkael A Sekeres, Jacqueline Boultwood, Seishi Ogawa, Jaroslaw P Maciejewski
BACKGROUND: Deletion of chromosome 5q (del(5q)) is the most common karyotypic abnormality in myeloid neoplasms. MATERIALS AND METHODS: To define the pathogenic molecular features associated with del(5q), next-generation sequencing was applied to 133 patients with myeloid neoplasms (MDS; N = 69, MDS/MPN; N = 5, sAML; N = 29, pAML; N = 30) with del(5q) as a sole abnormally or a part of complex karyotype and results were compared to molecular features of patients diploid for chr5...
January 24, 2017: Oncotarget
https://www.readbyqxmd.com/read/27913495/germ-line-mutations-associated-with-leukemias
#12
REVIEW
Christopher C Porter
Several genetic syndromes have long been associated with a predisposition to the development of leukemia, including bone marrow failure syndromes, Down syndrome, and Li Fraumeni syndrome. Recent work has better defined the leukemia risk and outcomes in these syndromes. Also, in the last several years, a number of other germ line mutations have been discovered to define new leukemia predisposition syndromes, including ANKRD26, GATA2, PAX5, ETV6, and DDX41 In addition, data suggest that a substantial proportion of patients with therapy related leukemias harbor germ line mutations in DNA damage response genes such as BRCA1/2 and TP53 Recognition of clinical associations, acquisition of a thorough family history, and high index-of-suspicion are critical in the diagnosis of these leukemia predisposition syndromes...
December 2, 2016: Hematology—the Education Program of the American Society of Hematology
https://www.readbyqxmd.com/read/27819178/myelodysplastic-syndromes-and-acute-leukemia-with-genetic-predispositions-a-new-challenge-for-hematologists
#13
REVIEW
Nicolas Duployez, Sophie Lejeune, Aline Renneville, Claude Preudhomme
The determination of an underlying genetic predisposition is not automatically part of the diagnosis of hematological malignancies (HM) in routine practice. However, it is assumed that genetic predispositions to HM are currently underestimated due to great variations in disease phenotype, variable latency and incomplete penetrance. Most of patients do not display any biological or clinical signs besides the overt hematological disease and many of them have a lack of personal or family history of malignancies...
December 2016: Expert Review of Hematology
https://www.readbyqxmd.com/read/27795557/re-emergence-of-acute-myeloid-leukemia-in-donor-cells-following-allogeneic-transplantation-in-a-family-with-a-germline-ddx41-mutation
#14
LETTER
G Berger, E van den Berg, B Sikkema-Raddatz, K M Abbott, R J Sinke, L B Bungener, A B Mulder, E Vellenga
No abstract text is available yet for this article.
February 2017: Leukemia: Official Journal of the Leukemia Society of America, Leukemia Research Fund, U.K
https://www.readbyqxmd.com/read/27721487/structural-and-functional-analysis-of-ddx41-a-bispecific-immune-receptor-for-dna-and-cyclic-dinucleotide
#15
Hiroki Omura, Daisuke Oikawa, Takanori Nakane, Megumi Kato, Ryohei Ishii, Ryuichiro Ishitani, Fuminori Tokunaga, Osamu Nureki
In the innate immune system, pattern recognition receptors (PRRs) specifically recognize ligands derived from bacteria or viruses, to trigger the responsible downstream pathways. DEAD box protein 41 (DDX41) is an intracellular PRR that triggers the downstream pathway involving the adapter STING, the kinase TBK1, and the transcription factor IRF3, to activate the type I interferon response. DDX41 is unique in that it recognizes two different ligands; i.e., double-stranded DNA (dsDNA) and cyclic dinucleotides (CDN), via its DEAD domain...
October 10, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27502187/the-emerging-roles-of-the-ddx41-protein-in-immunity-and-diseases
#16
REVIEW
Yan Jiang, Yanping Zhu, Zhi-Jie Liu, Songying Ouyang
RNA helicases are involved in almost every aspect of RNA, from transcription to RNA decay. DExD/H-box helicases comprise the largest SF2 helicase superfamily, which are characterized by two conserved RecA-like domains. In recent years, an increasing number of unexpected functions of these proteins have been discovered. They play important roles not only in innate immune response but also in diseases like cancers and chronic hepatitis C. In this review, we summarize the recent literatures on one member of the SF2 superfamily, the DEAD-box protein DDX41...
February 2017: Protein & Cell
https://www.readbyqxmd.com/read/27384852/genetic-predisposition-to-pediatric-myeloid-malignancies
#17
Hideki Muramatsu
Various genetic disorders are known to be associated with cancer predisposition. For example, children with Down syndrome are predisposed to developing acute myeloid leukemia, and those with RASopathies, such as Noonan syndrome, are predisposed to juvenile myelomonocytic leukemia. To date, more than 250 diseases or syndromes have been reported to be associated with the development of pediatric cancers. Recently, the advent of the massive parallel sequencing technique revealed several germline mutations, including RUNX1, CEBPA, GATA2, SRP72, ETV6, and DDX41, which are associated with familial myeloid malignancies...
June 2016: [Rinshō Ketsueki] the Japanese Journal of Clinical Hematology
https://www.readbyqxmd.com/read/27248996/hereditary-predispositions-to-myelodysplastic-syndrome
#18
REVIEW
Sarah A Bannon, Courtney D DiNardo
Myelodysplastic syndromes (MDS) are heterogeneous clonal hematopoietic disorders characterized by ineffective hematopoiesis, bone marrow dysplasia, and peripheral cytopenias. Familial forms of MDS have traditionally been considered rare, especially in adults; however, the increasing availability of somatic and germline genetic analyses has identified multiple susceptibility loci. Bone marrow failure syndromes have been well-described in the pediatric setting, e.g., Fanconi anemia (FA), dyskeratosis congenita (DC), Diamond-Blackfan anemia (DBA), and Shwachman-Diamond syndrome (SBS), hallmarked by clinically-recognizable phenotypes (e...
May 30, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27210295/evaluation-of-patients-and-families-with-concern-for-predispositions-to-hematologic-malignancies-within-the-hereditary-hematologic-malignancy-clinic-hhmc
#19
Courtney D DiNardo, Sarah A Bannon, Mark Routbort, Anna Franklin, Maureen Mork, Mary Armanios, Emily M Mace, Jordan S Orange, Meselle Jeff-Eke, Jane E Churpek, Koichi Takahashi, Jeffrey L Jorgensen, Guillermo Garcia-Manero, Steve Kornblau, Alison Bertuch, Hannah Cheung, Kapil Bhalla, Andrew Futreal, Lucy A Godley, Keyur P Patel
INTRODUCTION: Although multiple predispositions to hematologic malignancies exist, evaluations for hereditary cancer syndromes (HCS) are underperformed by most hematologist/oncologists. Criteria for initiating HCS evaluation are poorly defined, and results of genetic testing for hereditary hematologic malignancies have not been systematically reported. PATIENTS AND METHODS: From April 2014 to August 2015, 67 patients were referred to the Hereditary Hematologic Malignancy Clinic (HHMC)...
July 2016: Clinical Lymphoma, Myeloma & Leukemia
https://www.readbyqxmd.com/read/27174803/biological-implications-of-somatic-ddx41-p-r525h-mutation-in-acute-myeloid-leukemia
#20
Moe Kadono, Akinori Kanai, Akiko Nagamachi, Satoru Shinriki, Jin Kawata, Koji Iwato, Taiichi Kyo, Kumi Oshima, Akihiko Yokoyama, Takeshi Kawamura, Reina Nagase, Daichi Inoue, Toshio Kitamura, Toshiya Inaba, Tatsuo Ichinohe, Hirotaka Matsui
The DDX41 gene, encoding a DEAD-box type ATP-dependent RNA helicase, is rarely but reproducibly mutated in myeloid diseases. The acquired mutation in DDX41 is highly concentrated at c.G1574A (p.R525H) in the conserved motif VI located at the C-terminus of the helicase core domain where ATP interacts and is hydrolyzed. Therefore, it is likely that the p.R525H mutation perturbs ATPase activity in a dominant-negative manner. In this study, we screened for the DDX41 mutation of CD34-positive tumor cells based on mRNA sequencing and identified the p...
August 2016: Experimental Hematology
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