TY  - JOUR
A1  - Dornelas, Maria
A1  - Antão, Laura H.
A1  - Moyes, Faye
A1  - Bates, Amanda E.
A1  - Magurran, Anne E.
A1  - Adam, Dušan
A1  - Akhmetzhanova, Asem A.
A1  - Appeltans, Ward
A1  - Arcos, José Manuel
A1  - Arnold, Haley
A1  - Ayyappan, Narayanan
A1  - Badihi, Gal
A1  - Baird, Andrew H.
A1  - Barbosa, Miguel
A1  - Barreto, Tiago Egydio
A1  - Bässler, Claus
A1  - Bellgrove, Alecia
A1  - Belmaker, Jonathan
A1  - Benedetti-Cecchi, Lisandro
A1  - Bett, Brian J.
A1  - Bjorkman, Anne D.
A1  - Błażewicz, Magdalena
A1  - Blowes, Shane A.
A1  - Bloch, Christopher P. Bloch
A1  - Bonebrake, Timothy C.
A1  - Boyd, Susan
A1  - Bradford, Matt
A1  - Brooks, Andrew J.
A1  - Brown, James H.
A1  - Bruelheide, Helge
A1  - Budy, Phaedra
A1  - Carvalho, Fernando
A1  - Castañeda-Moya, Edward
A1  - Chen, Chaolun Allen
A1  - Chamblee, John F.
A1  - Chase, Tory J.
A1  - Siegwart Collier, Laura
A1  - Collinge, Sharon K.
A1  - Condit, Richard
A1  - Cooper, Elisabeth J.
A1  - Cornelissen, J. Hans C.
A1  - Cotano, Unai
A1  - Crow, Shannan Kyle
A1  - Damasceno, Gabriella
A1  - Davies, Claire H.
A1  - Davis, Robert A.
A1  - Day, Frank P.
A1  - Degraer, Steven
A1  - Doherty, Tim S.
A1  - Dunn, Timothy E.
A1  - Durigan, Giselda
A1  - Duffy, J. Emmett
A1  - Edelist, Dor
A1  - Edgar, Graham J.
A1  - Elahi, Robin
A1  - Elmendorf, Sarah C.
A1  - Enemar, Anders
A1  - Ernest, S. K. Morgan
A1  - Escribano, Rubén
A1  - Estiarte, Marc
A1  - Evans, Brian S.
A1  - Fan, Tung-Yung
A1  - Turini Farah, Fabiano
A1  - Loureiro Fernandes, Luiz
A1  - Farneda, Fábio Z.
A1  - Fidelis, Alessandra
A1  - Fitt, Robert
A1  - Fosaa, Anna Maria
A1  - Franco, Geraldo Antonio Daher Correa
A1  - Frank, Grace E.
A1  - Fraser, William R.
A1  - García, Hernando
A1  - Cazzolla Gatti, Roberto
A1  - Givan, Or
A1  - Gorgone-Barbosa, Elizabeth
A1  - Gould, William A.
A1  - Gries, Corinna
A1  - Grossman, Gary D.
A1  - Gutierréz, Julio R.
A1  - Hale, Stephen
A1  - Harmon, Mark E.
A1  - Harte, John
A1  - Haskins, Gary
A1  - Henshaw, Donald L.
A1  - Hermanutz, Luise
A1  - Hidalgo, Pamela
A1  - Higuchi, Pedro
A1  - Hoey, Andrew
A1  - Van Hoey, Gert
A1  - Hofgaard, Annika
A1  - Holeck, Kristen
A1  - Hollister, Robert D.
A1  - Holmes, Richard
A1  - Hoogenboom, Mia
A1  - Hsieh, Chih-hao
A1  - Hubbell, Stephen P.
A1  - Huettmann, Falk
A1  - Huffard, Christine L.
A1  - Hurlbert, Allen H.
A1  - Ivanauskas, Natália Macedo
A1  - Janík, David
A1  - Jandt, Ute
A1  - Jażdżewska, Anna
A1  - Johannessen, Tore
A1  - Johnstone, Jill
A1  - Jones, Julia
A1  - Jones, Faith A. M.
A1  - Kang, Jungwon
A1  - Kartawijaya, Tasrif
A1  - Keeley, Erin C.
A1  - Kelt, Douglas A.
A1  - Kinnear, Rebecca
A1  - Klanderud, Kari
A1  - Knutsen, Halvor
A1  - Koenig, Christopher C.
A1  - Kortz, Alessandra R.
A1  - Král, Kamil
A1  - Kuhnz, Linda A.
A1  - Kuo, Chao-Yang
A1  - Kushner, David J.
A1  - Laguionie-Marchais, Claire
A1  - Lancaster, Lesley T.
A1  - Lee, Cheol Min
A1  - Lefcheck, Jonathan S.
A1  - Lévesque, Esther
A1  - Lightfoot, David
A1  - Lloret, Francisco
A1  - Lloyd, John D.
A1  - López-Baucells, Adrià
A1  - Louzao, Maite
A1  - Madin, Joshua S.
A1  - Magnússon, Borgþór
A1  - Malamud, Shahar
A1  - Matthews, Iain
A1  - McFarland, Kent P.
A1  - McGill, Brian
A1  - McKnight, Diane
A1  - McLarney, William O.
A1  - Meador, Jason
A1  - Meserve, Peter L.
A1  - Metcalfe, Daniel J.
A1  - Meyer, Christoph F. J.
A1  - Michelsen, Anders
A1  - Milchakova, Nataliya
A1  - Moens, Tom
A1  - Moland, Even
A1  - Moore, Jon
A1  - Moreira, Carolina Mathias
A1  - Müller, Jörg
A1  - Murphy, Grace
A1  - Myers-Smith, Isla H.
A1  - Myster, Randall W.
A1  - Naumov, Andrew
A1  - Neat, Francis
A1  - Nelson, James A.
A1  - Nelson, Michael Paul
A1  - Newton, Stephen F.
A1  - Norden, Natalia
A1  - Oliver, Jeffrey C.
A1  - Olsen, Esben M.
A1  - Onipchenko, Vladimir G.
A1  - Pabis, Krzysztof
A1  - Pabst, Robert J.
A1  - Paquette, Alain
A1  - Pardede, Sinta
A1  - Paterson, David M.
A1  - Pélissier, Raphaël
A1  - Peñuelas, Josep
A1  - Pérez-Matus, Alejandro
A1  - Pizarro, Oscar
A1  - Pomati, Francesco
A1  - Post, Eric
A1  - Prins, Herbert H. T.
A1  - Priscu, John C.
A1  - Provoost, Pieter
A1  - Prudic, Kathleen L.
A1  - Pulliainen, Erkki
A1  - Ramesh, B. R.
A1  - Ramos, Olivia Mendivil
A1  - Rassweiler, Andrew
A1  - Rebelo, Jose Eduardo
A1  - Reed, Daniel C.
A1  - Reich, Peter B.
A1  - Remillard, Suzanne M.
A1  - Richardson, Anthony J.
A1  - Richardson, J. Paul
A1  - van Rijn, Itai
A1  - Rocha, Ricardo
A1  - Rivera-Monroy, Victor H.
A1  - Rixen, Christian
A1  - Robinson, Kevin P.
A1  - Rodrigues, Ricardo Ribeiro
A1  - de Cerqueira Rossa-Feres, Denise
A1  - Rudstam, Lars
A1  - Ruhl, Henry
A1  - Ruz, Catalina S.
A1  - Sampaio, Erica M.
A1  - Rybicki, Nancy
A1  - Rypel, Andrew
A1  - Sal, Sofia
A1  - Salgado, Beatriz
A1  - Santos, Flavio A. M.
A1  - Savassi-Coutinho, Ana Paula
A1  - Scanga, Sara
A1  - Schmidt, Jochen
A1  - Schooley, Robert
A1  - Setiawan, Fakhrizal
A1  - Shao, Kwang-Tsao
A1  - Shaver, Gaius R.
A1  - Sherman, Sally
A1  - Sherry, Thomas W.
A1  - Siciński, Jacek
A1  - Sievers, Caya
A1  - da Silva, Ana Carolina
A1  - da Silva, Fernando Rodrigues
A1  - Silveira, Fabio L.
A1  - Slingsby, Jasper
A1  - Smart, Tracey
A1  - Snell, Sara J.
A1  - Soudzilovskaia, Nadejda A.
A1  - Souza, Gabriel B. G.
A1  - Souza, Flaviana Maluf
A1  - Souza, Vinícius Castro
A1  - Stallings, Christopher D.
A1  - Stanforth, Rowan
A1  - Stanley, Emily H.
A1  - Sterza, José Mauro
A1  - Stevens, Maarten
A1  - Stuart-Smith, Rick
A1  - Suarez, Yzel Rondon
A1  - Supp, Sarah
A1  - Tamashiro, Jorge Yoshio
A1  - Tarigan, Sukmaraharja
A1  - Thiede, Gary P.
A1  - Thorn, Simon
A1  - Tolvanen, Anne
A1  - Toniato, Maria Teresa Zugliani
A1  - Totland, Ørjan
A1  - Twilley, Robert R.
A1  - Vaitkus, Gediminas
A1  - Valdivia, Nelson
A1  - Vallejo, Martha Isabel
A1  - Valone, Thomas J.
A1  - Van Colen, Carl
A1  - Vanaverbeke, Jan
A1  - Venturoli, Fabio
A1  - Verheye, Hans M.
A1  - Vianna, Marcelo
A1  - Vieira, Rui P.
A1  - Vrška, Tomáš
A1  - Vu, Con Quang
A1  - Vu, Lien Van
A1  - Waide, Robert B.
A1  - Waldock, Conor
A1  - Watts, Dave
A1  - Webb, Sara
A1  - Wesołowski, Tomasz
A1  - White, Ethan P.
A1  - Widdicombe, Claire E.
A1  - Wilgers, Dustin
A1  - Williams, Richard
A1  - Williams, Stefan B.
A1  - Williamson, Mark
A1  - Willig, Michael R.
A1  - Willis, Trevor J.
A1  - Wipf, Sonja
A1  - Woods, Kerry D.
A1  - Woehler, Eric J.
A1  - Zawada, Kyle
A1  - Zettler, Michael L.
T1  - BioTIME: A database of biodiversity time series for the Anthropocene
JF  - Global Ecology and Biogeography
N2  - Motivation
The BioTIME database contains raw data on species identities and abundances in ecological assemblages through time. These data enable users to calculate temporal trends in biodiversity within and amongst assemblages using a broad range of metrics. BioTIME is being developed as a community-led open-source database of biodiversity time series. Our goal is to accelerate and facilitate quantitative analysis of temporal patterns of biodiversity in the Anthropocene.

Main types of variables included
The database contains 8,777,413 species abundance records, from assemblages consistently sampled for a minimum of 2 years, which need not necessarily be consecutive. In addition, the database contains metadata relating to sampling methodology and contextual information about each record.

Spatial location and grain
BioTIME is a global database of 547,161 unique sampling locations spanning the marine, freshwater and terrestrial realms. Grain size varies across datasets from 0.0000000158 km2 (158 cm2) to 100 km2 (1,000,000,000,000 cm2).

Time period and grain
BioTIME records span from 1874 to 2016. The minimal temporal grain across all datasets in BioTIME is a year.

Major taxa and level of measurement
BioTIME includes data from 44,440 species across the plant and animal kingdoms, ranging from plants, plankton and terrestrial invertebrates to small and large vertebrates.

Software format
.csv and .SQL.
KW  - biodiversity
KW  - global
KW  - spatial
KW  - species richness
KW  - temporal
KW  - turnover
Y1  - 2018
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-222846
VL  - 27
ER  - 
TY  - JOUR
A1  - Dörk, Thilo
A1  - Peterlongo, Peter
A1  - Mannermaa, Arto
A1  - Bolla, Manjeet K.
A1  - Wang, Qin
A1  - Dennis, Joe
A1  - Ahearn, Thomas
A1  - Andrulis, Irene L.
A1  - Anton-Culver, Hoda
A1  - Arndt, Volker
A1  - Aronson, Kristan J.
A1  - Augustinsson, Annelie
A1  - Beane Freeman, Laura E.
A1  - Beckmann, Matthias W.
A1  - Beeghly-Fadiel, Alicia
A1  - Behrens, Sabine
A1  - Bermisheva, Marina
A1  - Blomqvist, Carl
A1  - Bogdanova, Natalia V.
A1  - Bojesen, Stig E.
A1  - Brauch, Hiltrud
A1  - Brenner, Hermann
A1  - Burwinkel, Barbara
A1  - Canzian, Federico
A1  - Chan, Tsun L.
A1  - Chang-Claude, Jenny
A1  - Chanock, Stephen J.
A1  - Choi, Ji-Yeob
A1  - Christiansen, Hans
A1  - Clarke, Christine L.
A1  - Couch, Fergus J.
A1  - Czene, Kamila
A1  - Daly, Mary B.
A1  - dos-Santos-Silva, Isabel
A1  - Dwek, Miriam
A1  - Eccles, Diana M.
A1  - Ekici, Arif B.
A1  - Eriksson, Mikael
A1  - Evans, D. Gareth
A1  - Fasching, Peter A.
A1  - Figueroa, Jonine
A1  - Flyger, Henrik
A1  - Fritschi, Lin
A1  - Gabrielson, Marike
A1  - Gago-Dominguez, Manuela
A1  - Gao, Chi
A1  - Gapstur, Susan M.
A1  - García-Closas, Montserrat
A1  - García-Sáenz, José A.
A1  - Gaudet, Mia M.
A1  - Giles, Graham G.
A1  - Goldberg, Mark S.
A1  - Goldgar, David E.
A1  - Guenél, Pascal
A1  - Haeberle, Lothar
A1  - Haimann, Christopher A.
A1  - Håkansson, Niclas
A1  - Hall, Per
A1  - Hamann, Ute
A1  - Hartman, Mikael
A1  - Hauke, Jan
A1  - Hein, Alexander
A1  - Hillemanns, Peter
A1  - Hogervorst, Frans B. L.
A1  - Hooning, Maartje J.
A1  - Hopper, John L.
A1  - Howell, Tony
A1  - Huo, Dezheng
A1  - Ito, Hidemi
A1  - Iwasaki, Motoki
A1  - Jakubowska, Anna
A1  - Janni, Wolfgang
A1  - John, Esther M.
A1  - Jung, Audrey
A1  - Kaaks, Rudolf
A1  - Kang, Daehee
A1  - Kapoor, Pooja Middha
A1  - Khusnutdinova, Elza
A1  - Kim, Sung-Won
A1  - Kitahara, Cari M.
A1  - Koutros, Stella
A1  - Kraft, Peter
A1  - Kristensen, Vessela N.
A1  - Kwong, Ava
A1  - Lambrechts, Diether
A1  - Le Marchand, Loic
A1  - Li, Jingmei
A1  - Lindström, Sara
A1  - Linet, Martha
A1  - Lo, Wing-Yee
A1  - Long, Jirong
A1  - Lophatananon, Artitaya
A1  - Lubiński, Jan
A1  - Manoochehri, Mehdi
A1  - Manoukian, Siranoush
A1  - Margolin, Sara
A1  - Martinez, Elena
A1  - Matsuo, Keitaro
A1  - Mavroudis, Dimitris
A1  - Meindl, Alfons
A1  - Menon, Usha
A1  - Milne, Roger L.
A1  - Mohd Taib, Nur Aishah
A1  - Muir, Kenneth
A1  - Mulligan, Anna Marie
A1  - Neuhausen, Susan L.
A1  - Nevanlinna, Heli
A1  - Neven, Patrick
A1  - Newman, William G.
A1  - Offit, Kenneth
A1  - Olopade, Olufunmilayo I.
A1  - Olshan, Andrew F.
A1  - Olson, Janet E.
A1  - Olsson, Håkan
A1  - Park, Sue K.
A1  - Park-Simon, Tjoung-Won
A1  - Peto, Julian
A1  - Plaseska-Karanfilska, Dijana
A1  - Pohl-Rescigno, Esther
A1  - Presneau, Nadege
A1  - Rack, Brigitte
A1  - Radice, Paolo
A1  - Rashid, Muhammad U.
A1  - Rennert, Gad
A1  - Rennert, Hedy S.
A1  - Romero, Atocha
A1  - Ruebner, Matthias
A1  - Saloustros, Emmanouil
A1  - Schmidt, Marjanka K.
A1  - Schmutzler, Rita K.
A1  - Schneider, Michael O.
A1  - Schoemaker, Minouk J.
A1  - Scott, Christopher
A1  - Shen, Chen-Yang
A1  - Shu, Xiao-Ou
A1  - Simard, Jaques
A1  - Slager, Susan
A1  - Smichkoska, Snezhana
A1  - Southey, Melissa C.
A1  - Spinelli, John J.
A1  - Stone, Jennifer
A1  - Surowy, Harald
A1  - Swerdlow, Anthony J.
A1  - Tamimi, Rulla M.
A1  - Tapper, William J.
A1  - Teo, Soo H.
A1  - Terry, Mary Beth
A1  - Toland, Amanda E.
A1  - Tollenaar, Rob A. E. M.
A1  - Torres, Diana
A1  - Torres-Mejía, Gabriela
A1  - Troester, Melissa A.
A1  - Truong, Thérèse
A1  - Tsugane, Shoichiro
A1  - Untch, Michael
A1  - Vachon, Celine M.
A1  - van den Ouweland, Ans M. W.
A1  - van Veen, Elke M.
A1  - Vijai, Joseph
A1  - Wendt, Camilla
A1  - Wolk, Alicja
A1  - Yu, Jyh-Cherng
A1  - Zheng, Wei
A1  - Ziogas, Argyrios
A1  - Ziv, Elad
A1  - Dunnig, Alison
A1  - Pharaoh, Paul D. P.
A1  - Schindler, Detlev
A1  - Devilee, Peter
A1  - Easton, Douglas F.
T1  - Two truncating variants in FANCC and breast cancer risk
JF  - Scientific Reports
N2  - Fanconi anemia (FA) is a genetically heterogeneous disorder with 22 disease-causing genes reported to date. In some FA genes, monoallelic mutations have been found to be associated with breast cancer risk, while the risk associations of others remain unknown. The gene for FA type C, FANCC, has been proposed as a breast cancer susceptibility gene based on epidemiological and sequencing studies. We used the Oncoarray project to genotype two truncating FANCC variants (p.R185X and p.R548X) in 64,760 breast cancer cases and 49,793 controls of European descent. FANCC mutations were observed in 25 cases (14 with p.R185X, 11 with p.R548X) and 26 controls (18 with p.R185X, 8 with p.R548X). There was no evidence of an association with the risk of breast cancer, neither overall (odds ratio 0.77, 95%CI 0.44–1.33, p = 0.4) nor by histology, hormone receptor status, age or family history. We conclude that the breast cancer risk association of these two FANCC variants, if any, is much smaller than for BRCA1, BRCA2 or PALB2 mutations. If this applies to all truncating variants in FANCC it would suggest there are differences between FA genes in their roles on breast cancer risk and demonstrates the merit of large consortia for clarifying risk associations of rare variants.
KW  - oncology
KW  - risk factors
Y1  - 2019
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-222838
VL  - 9
ER  - 
TY  - JOUR
A1  - Schulte, Leon N.
A1  - Schweinlin, Matthias
A1  - Westermann, Alexander J.
A1  - Janga, Harshavardhan
A1  - Santos, Sara C.
A1  - Appenzeller, Silke
A1  - Walles, Heike
A1  - Vogel, Jörg
A1  - Metzger, Marco
T1  - An Advanced Human Intestinal Coculture Model Reveals Compartmentalized Host and Pathogen Strategies during Salmonella Infection
JF  - mBio
N2  - A major obstacle in infection biology is the limited ability to recapitulate human disease trajectories in traditional cell culture and animal models, which impedes the translation of basic research into clinics. Here, we introduce a three-dimensional (3D) intestinal tissue model to study human enteric infections at a level of detail that is not achieved by conventional two-dimensional monocultures. Our model comprises epithelial and endothelial layers, a primary intestinal collagen scaffold, and immune cells. Upon Salmonella infection, the model mimics human gastroenteritis, in that it restricts the pathogen to the epithelial compartment, an advantage over existing mouse models. Application of dual transcriptome sequencing to the Salmonella-infected model revealed the communication of epithelial, endothelial, monocytic, and natural killer cells among each other and with the pathogen. Our results suggest that Salmonella uses its type III secretion systems to manipulate STAT3-dependent inflammatory responses locally in the epithelium without accompanying alterations in the endothelial compartment. Our approach promises to reveal further human-specific infection strategies employed by Salmonella and other pathogens.

IMPORTANCE Infection research routinely employs in vitro cell cultures or in vivo mouse models as surrogates of human hosts. Differences between murine and human immunity and the low level of complexity of traditional cell cultures, however, highlight the demand for alternative models that combine the in vivo-like properties of the human system with straightforward experimental perturbation. Here, we introduce a 3D tissue model comprising multiple cell types of the human intestinal barrier, a primary site of pathogen attack. During infection with the foodborne pathogen Salmonella enterica serovar Typhimurium, our model recapitulates human disease aspects, including pathogen restriction to the epithelial compartment, thereby deviating from the systemic infection in mice. Combination of our model with state-of-the-art genetics revealed Salmonella-mediated local manipulations of human immune responses, likely contributing to the establishment of the pathogen's infection niche. We propose the adoption of similar 3D tissue models to infection biology, to advance our understanding of molecular infection strategies employed by bacterial pathogens in their human host.
KW  - Salmonella
KW  - gene expression
KW  - infectious disease
Y1  - 2020
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-229428
VL  - 11, 2020
IS  - 1
ER  - 
TY  - THES
A1  - Santos, Sara F. C.
T1  - Expanding the targetome of Salmonella small RNA PinT using MS2 affinity purification and RNA-Seq (MAPS)
T1  - Erweiterung des Targetoms der kleinen RNA PinT von Salmonella mittels MS2-Affinitätsaufreinigung und RNA-seq (MAPS)
N2  - Bacterial small RNAs are key mediators of post-transcriptional gene regulation. An increasing number of sRNAs have been implicated in the regulation of virulence programs of pathogenic bacteria. Recently, in the enteric pathogen Salmonella Typhimurium, the PinT sRNA has gained increased importance as it is the most upregulated sRNA as Salmonella infects mammalian host cells (Westermann et al., 2016). PinT acts as a temporal regulator of Salmonella‘s two major pathogenicity islands, SPI-1 and SPI-2 (Kim et al., 2019; Westermann et al., 2016). However, the complete set of PinT targets, its role in Salmonella infection and host response is not yet fully understood. Building on the MS2 affinity purification and RNA- seq (MAPS) method (Lalaouna et al., 2015), we here set out to globally identify direct RNA ligands of PinT, relevant to Salmonella infection. We transferred the classical MAPS technique, based on sRNA-bait overexpression, to more physiological conditions, using endogenous levels of the sRNA. Making the henceforth identified targets, less likely to represent artefacts of the overexpression. More importantly, we progressed the MAPS technique to in vivo settings and by doing so, we were able pull-down bacterial RNA transcripts bound by PinT during macrophage infection. While we validate previously known PinT targets, our integrated data revealed novel virulence relevant target. These included mRNAs for the SPI-2 effector SteC, the PhoQ activator UgtL and the 30S ribosomal protein S22 RpsV. Next, we follow up on SteC, the best characterized virulence relevant PinT target. Using genetic and biochemical assays, we demonstrate that PinT represses steC mRNA by direct base-pairing and translational interference. PinT-mediated regulation of SteC leads to alterations in the host response to Salmonella infection. This regulation impacts the cytokine response of infected macrophages, by altering IL10 production, and possibly driving the macrophages to an anti-inflammatory state, more permise to infection. SteC is responsible for F-actin meshwork rearrangements around the SCV (Poh et al., 2008). Here we demonstrate that PinT-mediated regulation of SteC, impacts the formation of this actin meshwork in infected cells. Our results demonstrate that SteC expression is very tightly regulated by PinT in two layers; indirectly, by repressing ssrB and crp; and directly by binding to steC 5’UTR. PinT contributes to post-transcriptional cross-talk between invasion and intracellular replication programs of Salmonella, by controlling the expression of both SPI-1 and SPI-2 genes (directly and indirectly). Together, our collective data makes PinT the first sRNA in Gram-negatives with a pervasive role in virulence, at the center of Salmonella virulence programs and provide molecular input that could help explain the attenuation of pinT-deficient Salmonella strains in whole animal models of infection.
N2  - Kleine RNAs sind zentrale Stellschrauben der posttranskriptionellen Genregulation in Bakterien. Eine zunehmende Anzahl von sRNAs ist an der Regulation von Virulenzprogrammen pathogener Bakterien beteiligt. In jüngster Zeit hat beim enterischen Erreger Salmonella Typhimurium die PinT-sRNA an Bedeutung gewonnen, da sie die am stärksten hochregulierte sRNA während der Infektion von Säugetierwirtszellen ist (Westermann et al., 2016). PinT fungiert als zeitlicher Regulator der beiden wichtigsten Pathogenitätsinseln von Salmonella, SPI-1 und SPI-2 (Kim et al., 2019a; Westermann et al., 2016). Die vollständige Liste der Targets von PinT und die Rolle von PinT bei der Salmonella-Infektion sowie der Wirstantwort sind jedoch noch nicht vollständig aufgeklärt. Mit Hilfe der MS2 affinity purification and RNA-seq (MAPS)-Methode (Lalaouna et al., 2015) möchten wir hier direkte RNA-Liganden von PinT identifizieren, die für die Salmonella-Infektion relevant sind. Wir übertragen die klassische MAPS-Technik, die auf der Überexpression von sRNA-Baits basiert, auf physiologischere Bedingungen unter Verwendung endogener Mengen der sRNA. Dadurch wird die Wahrschienlichkeit, dass die identifizierten Targets Artefakte sind, verringert. Darüber hinaus sind wir in der Lage, die MAPS-Technik unter in vivo-Bedingungen durchzuführen. Auf diese Weise konnten wie bakterielle Transkripte, die während einer Makrophageninfektion an PinT gebunden wurden, isolieren. Während wir bereits bekannte PinT-Ziele validieren, identifizieren unsere integrierten Daten ein neues Target, das für Virulenz relevant ist. Dazu gehörten mRNAs für den SPI-2-Effektor SteC, den PhoQ-Aktivator UgtL und das ribosomale 30S-Protein S22 RpsV. Zunächst untersuchen wir SteC, das am besten charakterisierte virulenzrelevante PinT-Ziel. Anhand genetischer und biochemischer Assays zeigen wir, dass PinT die steC-mRNA durch direkte Basenpaarung und Translationsrepression reguliert. Die PinT-vermittelte Regulation von SteC führt zu einer veränderten Wirtsreaktion auf eine Salmonella-Infektion. Diese Regulation beeinflusst die Zytokinreaktion infizierter Makrophagen, indem sie die IL10-Produktion verändert und die Makrophagen möglicherweise in einen entzündungshemmenden Zustand versetzt, der sie anfälliger für eine Infektion macht. SteC ist verantwortlich für die Umlagerung von F-Actin-Netzen um die SCV (Poh et al., 2008). Hier zeigen wir, dass die PinT-vermittelte Regulation von SteC die Bildung dieses Aktin-Netzwerks in infizierten Zellen beeinflusst. Unsere Ergebnisse zeigen, dass die Regulation der SteC-Expression durch PinT auf zwei Ebenden stattfindet: indirekt durch Unterdrückung von ssrB und crp; und direkt durch Bindung an steC 5’UTR. PinT trägt zum posttranskriptionellen Crosstalk zwischen Invasions- und intrazellulären Replikationsprogrammen von Salmonella bei, indem die Expression von SPI-1- und SPI-2-Genen (direkt und indirekt) gesteuert wird. Insgesamt macht unterstreichen unsere Daten die zentrale Rolle von PinT in Virulenzprogrammen von Salmonella. PinT ist die erste sRNA in Gram-Negativen mit einer derart durchdringenden Rolle bei der Virulenz. Zudem liefern unsere Ergebnisse Einblick auf molekularer Ebene, die die Attenuation von PinT-defizienten Salmonella-Stämmen in Tiermodellen erklären könnte.
KW  - Salmonella
KW  - small RNA
KW  - PinT
KW  - MS2-affinity purification and RNA-seq
KW  - effector protein
KW  - SteC
Y1  - 2021
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-204926
ER  -