scholarly journals Characterization of human disease phenotypes associated with mutations inTREX1,RNASEH2A,RNASEH2B,RNASEH2C,SAMHD1,ADAR, andIFIH1

2015 ◽  
Vol 167 (2) ◽  
pp. 296-312 ◽  
Author(s):  
Yanick J. Crow ◽  
Diana S. Chase ◽  
Johanna Lowenstein Schmidt ◽  
Marcin Szynkiewicz ◽  
Gabriella M.A. Forte ◽  
...  
Keyword(s):  
Human Disease ◽  
Disease Phenotypes

Model Characterization of Pulmonary Arterial Hypertension: Analysis of Lung Pathology with Respect to Human Disease

2020 ◽  
Author(s):  
◽  
Eptisam lambu
Keyword(s):  
Pulmonary Arterial Hypertension ◽  
Arterial Hypertension ◽  
Human Disease ◽  
Vascular Remodeling ◽  
Vascular Wall ◽  
Lung Pathology ◽  
Pulmonary Arterial ◽  
Lung Pathogenesis ◽  
Arterial Endothelial Cells

Pulmonary arterial hypertension (PAH) is a rare multifactorial disease characterized by abnormal high blood pressure in the pulmonary artery, or increased pulmonary vascular resistance (PVR), caused by obstruction in the small arteries of the lung. Increased PVR is also thought to be caused by abnormal vascular remodeling, due to thickening of the pulmonary vascular wall resulting from significant hypertrophy of pulmonary arterial smooth-muscle cells (PASMCs) and increased proliferation/impaired apoptosis of pulmonary arterial endothelial cells (PAECs). Herein, we investigated the mechanisms and explored molecular pathways mediating the lung pathogenesis in two PAH rat models: Monocrotaline (MCT) and Sugen5416/Hypoxia (SuHx). We analyzed these disease models to determine where the vasculature shows the most severe PAH pathology and which model best recapitulates the human disease. We investigated the role vascular remodeling, hypoxia, cell proliferation, apoptosis, DNA damage and inflammation play in the pathogenesis of PAH. Neither model recapitulated all features of the human disease, however each model presented with some of the pathology seen in PAH patients.

scholarly journals Erratum: CRISPR-engineered mosaicism rapidly reveals that loss of Kcnj13 function in mice mimics human disease phenotypes

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Hua Zhong ◽  
Yiyun Chen ◽  
Yumei Li ◽  
Rui Chen ◽  
Graeme Mardon
Keyword(s):  
Human Disease ◽  
Disease Phenotypes

scholarly journals Molecular insights into regulation of JAK2 in myeloproliferative neoplasms

Blood ◽  
2015 ◽  
Vol 125 (22) ◽  
pp. 3388-3392 ◽  
Author(s):  
Olli Silvennoinen ◽  
Stevan R. Hubbard
Keyword(s):  
Molecular Characterization ◽  
Human Disease ◽  
Molecular Mechanisms ◽  
Myeloproliferative Neoplasms ◽  
Critical Role ◽  
Hematologic Malignancies ◽  
Janus Kinase ◽  
Constitutive Activation

Abstract The critical role of Janus kinase-2 (JAK2) in regulation of myelopoiesis was established 2 decades ago, but identification of mutations in the pseudokinase domain of JAK2 in myeloproliferative neoplasms (MPNs) and in other hematologic malignancies highlighted the role of JAK2 in human disease. These findings have revolutionized the diagnostics of MPNs and led to development of novel JAK2 therapeutics. However, the molecular mechanisms by which mutations in the pseudokinase domain lead to hyperactivation of JAK2 and clinical disease have been unclear. Here, we describe recent advances in the molecular characterization of the JAK2 pseudokinase domain and how pathogenic mutations lead to constitutive activation of JAK2.

scholarly journals The signaling lipid PI(3,5)P2 stabilizes V1–Vo sector interactions and activates the V-ATPase

2014 ◽  
Vol 25 (8) ◽  
pp. 1251-1262 ◽  
Author(s):  
Sheena Claire Li ◽  
Theodore T. Diakov ◽  
Tao Xu ◽  
Maureen Tarsio ◽  
Wandi Zhu ◽  
...  
Keyword(s):  
Salt Stress ◽  
Atpase Activity ◽  
Human Disease ◽  
Proton Pumps ◽  
Disease Phenotypes ◽  
Reversible Dissociation ◽  
Signaling Mechanisms ◽  
Vacuolar Acidification ◽  
Direct Binding

Vacuolar proton-translocating ATPases (V-ATPases) are highly conserved, ATP-driven proton pumps regulated by reversible dissociation of its cytosolic, peripheral V1 domain from the integral membrane Vo domain. Multiple stresses induce changes in V1-Vo assembly, but the signaling mechanisms behind these changes are not understood. Here we show that certain stress-responsive changes in V-ATPase activity and assembly require the signaling lipid phosphatidylinositol 3,5-bisphosphate (PI(3,5)P2). V-ATPase activation through V1-Vo assembly in response to salt stress is strongly dependent on PI(3,5)P2 synthesis. Purified Vo complexes preferentially bind to PI(3,5)P2 on lipid arrays, suggesting direct binding between the lipid and the membrane sector of the V-ATPase. Increasing PI(3,5)P2 levels in vivo recruits the N-terminal domain of Vo-sector subunit Vph1p from cytosol to membranes, independent of other subunits. This Vph1p domain is critical for V1-Vo interaction, suggesting that interaction of Vph1p with PI(3,5)P2-containing membranes stabilizes V1-Vo assembly and thus increases V-ATPase activity. These results help explain the previously described vacuolar acidification defect in yeast fab1∆ and vac14∆ mutants and suggest that human disease phenotypes associated with PI(3,5)P2 loss may arise from compromised V-ATPase stability and regulation.

scholarly journals Comprehensive intra/extracellular myocardial structural and functional characterization of hypertensive heart disease phenotypes

2016 ◽  
Vol 18 (S1) ◽  
Author(s):  
Jonathan C Rodrigues ◽  
Antonio Matteo Amadu ◽  
Amardeep Ghosh Dastidar ◽  
Gergely V Szantho ◽  
Cattleya Godsave ◽  
...  
Keyword(s):  
Heart Disease ◽  
Functional Characterization ◽  
Hypertensive Heart Disease ◽  
Disease Phenotypes

scholarly journals Functional characterization of osteosarcoma cell lines provides representative models to study the human disease

2011 ◽  
Vol 91 (8) ◽  
pp. 1195-1205 ◽  
Author(s):  
Alexander B Mohseny ◽  
Isidro Machado ◽  
Yongping Cai ◽  
Karl-Ludwig Schaefer ◽  
Massimo Serra ◽  
...  
Keyword(s):  
Cell Lines ◽  
Human Disease ◽  
Functional Characterization ◽  
Osteosarcoma Cell

scholarly journals Elucidation of an anaerobic pathway for metabolism of l-carnitine–derived γ-butyrobetaine to trimethylamine in human gut bacteria

2021 ◽  
Vol 118 (32) ◽  
pp. e2101498118
Author(s):  
Lauren J. Rajakovich ◽  
Beverly Fu ◽  
Maud Bollenbach ◽  
Emily P. Balskus
Keyword(s):  
Gene Cluster ◽  
Human Disease ◽  
Genetic Basis ◽  
Human Gut ◽  
Metabolizing Enzymes ◽  
Associated Bacteria ◽  
Microbial Function ◽  
Dietary Nutrient ◽  
Anoxic Environment

Trimethylamine (TMA) is an important gut microbial metabolite strongly associated with human disease. There are prominent gaps in our understanding of how TMA is produced from the essential dietary nutrient l-carnitine, particularly in the anoxic environment of the human gut where oxygen-dependent l-carnitine–metabolizing enzymes are likely inactive. Here, we elucidate the chemical and genetic basis for anaerobic TMA generation from the l-carnitine–derived metabolite γ-butyrobetaine (γbb) by the human gut bacterium Emergencia timonensis. We identify a set of genes up-regulated by γbb and demonstrate that the enzymes encoded by the induced γbb utilization (bbu) gene cluster convert γbb to TMA. The key TMA-generating step is catalyzed by a previously unknown type of TMA-lyase enzyme that utilizes a putative flavin cofactor to catalyze a redox-neutral transformation. We identify additional cultured and uncultured host-associated bacteria that possess the bbu gene cluster, providing insights into the distribution of anaerobic γbb metabolism. Lastly, we present genetic, transcriptional, and metabolomic evidence that confirms the relevance of this metabolic pathway in the human gut microbiota. These analyses indicate that the anaerobic pathway is a more substantial contributor to TMA generation from l-carnitine in the human gut than the previously proposed aerobic pathway. The discovery and characterization of the bbu pathway provides the critical missing link in anaerobic metabolism of l-carnitine to TMA, enabling investigation into the connection between this microbial function and human disease.

scholarly journals Isolation and genetic characterization of a relapsing fever spirochete isolated from Ornithodoros puertoricensis collected in central Panama

2021 ◽  
Vol 15 (8) ◽  
pp. e0009642
Author(s):  
Sergio E. Bermúdez ◽  
Brittany A. Armstrong ◽  
Lillian Domínguez ◽  
Aparna Krishnavajhala ◽  
Alexander R. Kneubehl ◽  
...  
Keyword(s):  
Latin America ◽  
North America ◽  
Central America ◽  
Human Disease ◽  
Genetic Characterization ◽  
Relapsing Fever ◽  
Tick Vector ◽  
The City ◽  
Central Panama

Tick-borne relapsing fever (TBRF) spirochetes are likely an overlooked cause of disease in Latin America. In Panama, the pathogens were first reported to cause human disease in the early 1900s. Recent collections of Ornithodoros puertoricensis from human dwellings in Panama prompted our interest to determine whether spirochetes still circulate in the country. Ornithodoros puertoricensis ticks were collected at field sites around the City of Panama. In the laboratory, the ticks were determined to be infected with TBRF spirochetes by transmission to mice, and we report the laboratory isolation and genetic characterization of a species of TBRF spirochete from Panama. Since this was the first isolation of a species of TBRF spirochete from Central America, we propose to designate the bacteria as Borrelia puertoricensis sp. nov. This is consistent with TBRF spirochete species nomenclature from North America that are designated after their tick vector. These findings warrant further investigations to assess the threat B. puertoricensis sp. nov. may impose on human health.

scholarly journals Building the vertebrate codex using the gene breaking protein trap library

eLife ◽  
2020 ◽  
Vol 9 ◽  
Author(s):  
Noriko Ichino ◽  
MaKayla R Serres ◽  
Rhianna M Urban ◽  
Mark D Urban ◽  
Anthony J Treichel ◽  
...  
Keyword(s):  
Human Disease ◽  
Molecular Mechanisms ◽  
Genetic Diseases ◽  
Transgenic Zebrafish ◽  
Protein Coding ◽  
Coding Regions ◽  
Disease Associated Genes ◽  
Functional Genome Annotation ◽  
Specific Mrna

One key bottleneck in understanding the human genome is the relative under-characterization of 90% of protein coding regions. We report a collection of 1200 transgenic zebrafish strains made with the gene-break transposon (GBT) protein trap to simultaneously report and reversibly knockdown the tagged genes. Protein trap-associated mRFP expression shows previously undocumented expression of 35% and 90% of cloned genes at 2 and 4 days post-fertilization, respectively. Further, investigated alleles regularly show 99% gene-specific mRNA knockdown. Homozygous GBT animals in ryr1b, fras1, tnnt2a, edar and hmcn1 phenocopied established mutants. 204 cloned lines trapped diverse proteins, including 64 orthologs of human disease-associated genes with 40 as potential new disease models. Severely reduced skeletal muscle Ca2+ transients in GBT ryr1b homozygous animals validated the ability to explore molecular mechanisms of genetic diseases. This GBT system facilitates novel functional genome annotation towards understanding cellular and molecular underpinnings of vertebrate biology and human disease.

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