Imperial College London

ProfessorJ SimonKroll

Faculty of MedicineDepartment of Infectious Disease

Emeritus Professor,Paediatrics&Molecular Infectious Diseases
 
 
 
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Contact

 

+44 (0)20 7594 3695s.kroll

 
 
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Assistant

 

Dr Robert Boyle +44 (0)20 7594 3990

 
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Location

 

245Wright Fleming WingSt Mary's Campus

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Summary

 

Publications

Publication Type
Year
to

145 results found

Maiden MCJ, Ibarz-Pavon AB, Urwin R, Gray SJ, Andrews NJ, Clarke SC, Walker AM, Evans MR, Kroll JS, Neal KR, Ala'Aldeen DAA, Crook DW, Cann K, Harrison S, Cunningham R, Baxter D, Kaczmarski E, MacLennan J, Cameron JC, Stuart JMet al., 2008, Impact of meningococcal serogroup C conjugate vaccines on carriage and herd immunity, 14th International Pathogenic Neisseria Conference, Publisher: OXFORD UNIV PRESS INC, Pages: 737-743, ISSN: 0022-1899

Conference paper

Zhou L, Jones SCP, Angen O, Bosse JT, Nash JHE, Frey J, Zhou R, Chen HC, Kroll JS, Rycroft AN, Langford PRet al., 2008, Multiplex PCR that can distinguish between immunologically cross-reactive serovar 3, 6, and 8 <i>Actinobacillus pleuropneumoniae</i> strains, JOURNAL OF CLINICAL MICROBIOLOGY, Vol: 46, Pages: 800-803, ISSN: 0095-1137

Journal article

Lafaye C, Iwena T, Ferrer J-L, Kroll JS, Griat M, Serre Let al., 2008, Preliminary crystallographic data of the three homologues of the thiol-disulfide oxidoreductase DsbA in <i>Neisseria meningitidis</i>, Workshop on Validation of Macromolecular Structures, Publisher: INT UNION CRYSTALLOGRAPHY, Pages: 111-114

Conference paper

Sinha S, Ambur OH, Langford PR, Tonjum T, Kroll JSet al., 2008, Reduced DNA binding and uptake in the absence of DsbA1 and DsbA2 of <i>Neisseria meningitidis</i> due to inefficient folding of the outer-membrane secretin PilQ, MICROBIOLOGY-SGM, Vol: 154, Pages: 217-225, ISSN: 1350-0872

Journal article

Callaghan MJ, Rockett K, Banner C, Haralambous E, Betts H, Faust S, Maiden MCJ, Kroll JS, Levin M, Kwiatkowski DP, Pollard AJet al., 2008, Haplotypic diversity in human CEACAM genes: effects on susceptibility to meningococcal disease, GENES AND IMMUNITY, Vol: 9, Pages: 30-37, ISSN: 1466-4879

Journal article

Nadel S, Kroll JS, 2007, Diagnosis and management of meningococcal disease: the need for centralized care, FEMS MICROBIOLOGY REVIEWS, Vol: 31, Pages: 71-83, ISSN: 0168-6445

Journal article

Hodgetts A, Levin M, Kroll J S, Langford P Ret al., 2007, Biomarker discovery in infectious diseases using SELDI, Future Microbiology, Vol: 2, Pages: 35-49

Journal article

Fung WWM, O'Dwyer CA, Sinha S, Brauer AL, Murphy TF, Kroll JS, Langford PRet al., 2006, Presence of copper- and zinc-containing superoxide dismutase in commensal <i>Haemophilus haemolyticus</i> isolates can be used as a marker to discriminate them from nontypeable <i>H-influenzae</i> isolates, JOURNAL OF CLINICAL MICROBIOLOGY, Vol: 44, Pages: 4222-4226, ISSN: 0095-1137

Journal article

Redfield RJ, Findlay WA, Bosse J, Kroll JS, Cameron ADS, Nash JHEet al., 2006, Evolution of competence and DNA uptake specificity in the Pasteurellaceae, BMC EVOLUTIONARY BIOLOGY, Vol: 6, ISSN: 1471-2148

Journal article

Bossé JT, Zhou L, Kroll JS, Langford PRet al., 2006, High-throughput identification of conditionally essential genes in bacteria: from STM to TSM., Infect Disord Drug Targets, Vol: 6, Pages: 241-262, ISSN: 1871-5265

Signature-tagged mutagenesis (STM) provided the first widely applicable high-throughput method for detecting conditionally essential genes in bacteria by using negative selection to screen large pools of transposon (Tn) mutants. STM requires no prior knowledge of the bacterium's genome sequence, and has been used to study a large number of Gram-positive and Gram-negative species, greatly expanding the repertoires of known virulence factors for these organisms. Originally, hybridization of radiolabelled probes to colony or dot blots was used to detect differences in populations of tagged mutants before and after growth under a selective condition. Modifications of the tag detection method involving polymerase chain reaction (PCR) amplification and visualisation by gel electrophoresis have been developed and can be automated through the use of robotics. Genetic footprinting is another negative selection technique that uses PCR amplification to detect loss of mutants from a pool. Unlike PCR-STM, this technique allows direct amplification of Tn-flanking sequences. However, it requires the bacterium's whole genome sequence in order to design specific primers for every gene of interest. More recently, a number of techniques have been described that combine the negative-selection principle of STM and genetic footprinting with the genome-wide screening power of DNA microarrays. These techniques, although also requiring whole genome sequences, use either a form of linker-mediated or semi-random PCR to amplify and label Tn-flanking regions for hybridization to microarrays. The superior sensitivity microarray detection allows greater numbers of mutants to be screened per pool, as well as determination of the coverage/distribution of insertions in the library prior to screening, two significant advantages over STM.

Journal article

Haralambous E, Dolly SO, Hibberd ML, Litt DJ, Udalova IA, ODwyer C, Langford PR, Kroll JS, Levin Met al., 2006, Factor H, a regulator of complement activity is a major determinant of meningococcal disease susceptibility in UK Caucasian patients., Scand J Infect Dis, Pages: 764-771

Journal article

O'Dwyer CA, Langford PR, Kroll JS, 2005, A novel neisserial shuttle plasmid: A useful new tool for meningococcal research, FEMS MICROBIOLOGY LETTERS, Vol: 251, Pages: 143-147, ISSN: 0378-1097

Journal article

Redfield RJ, Cameron ADS, Qian Q, Hinds J, Ali TR, Kroll JS, Langford PRet al., 2005, A novel CRP-dependent of competence genes in regulon controls expression <i>Haemophilus influenzae</i>, JOURNAL OF MOLECULAR BIOLOGY, Vol: 347, Pages: 735-747, ISSN: 0022-2836

Journal article

Ammendola S, Ajello M, Pasquali P, Kroll JS, Langford PR, Rotilio G, Valenti P, Battistoni Aet al., 2005, Differential contribution of <i>sodC1</i> and <i>sodC2</i> to intracellular survival and pathogenicity of <i>Salmonella enterica</i> serovar Choleraesuis, MICROBES AND INFECTION, Vol: 7, Pages: 698-707, ISSN: 1286-4579

Journal article

Southern J, Deane S, Ashton L, Borrow R, Goldblatt D, Andrews N, Balmer P, Morris R, Kroll JS, Miller Eet al., 2004, Effects of prior polysaccharide vaccination on magnitude, duration, and quality of immune responses to and safety profile of a meningococcal serogroup C tetanus toxoid conjugate vaccination in adults, CLINICAL AND DIAGNOSTIC LABORATORY IMMUNOLOGY, Vol: 11, Pages: 1100-1104, ISSN: 1071-412X

Journal article

O'Dwyer CA, Reddin K, Martin D, Taylor SC, Gorringe AR, Hudson MJ, Brodeur BR, Langford PR, Kroll JSet al., 2004, Expression of heterologous antigens in commensal <i>Neisseria</i> spp.:: Preservation of conformational epitopes with vaccine potential, INFECTION AND IMMUNITY, Vol: 72, Pages: 6511-6518, ISSN: 0019-9567

Journal article

Litt DJ, Savino S, Beddek A, Comanducci M, Sandiford C, Stevens J, Levin M, Ison C, Pizza M, Rappuoli R, Kroll JSet al., 2004, Putative vaccine antigens from <i>Neisseria meningitidis</i> recognized by serum antibodies of young children convalescing after meningococcal disease, JOURNAL OF INFECTIOUS DISEASES, Vol: 190, Pages: 1488-1497, ISSN: 0022-1899

Journal article

Sinha S, Langford PR, Kroll JS, 2004, Functional diversity of three different DsbA proteins from <i>Neisseria meningitidis</i>, MICROBIOLOGY-SGM, Vol: 150, Pages: 2993-3000, ISSN: 1350-0872

Journal article

Hodgetts A, Bossé JT, Kroll JS, Langford PRet al., 2004, Analysis of differential protein expression in <i>Actinobacillus pleuropneumoniae</i> by Surface Enhanced Laser Desorption Ionisation-ProteinChip™ (SELDI) technology, VETERINARY MICROBIOLOGY, Vol: 99, Pages: 215-225, ISSN: 0378-1135

Journal article

Bossé JT, Nash JHE, Kroll JS, Langford PRet al., 2004, Harnessing natural transformation in <i>Actinobacillus pleuropneumoniae</i>:: a simple method for allelic replacements, FEMS MICROBIOLOGY LETTERS, Vol: 233, Pages: 277-281, ISSN: 0378-1097

Journal article

Edwards-Jones B, Langford PR, Kroll JS, Yu Jet al., 2004, The role of the <i>Shigella flexneri yihE</i> gene in LPS synthesis and virulence, MICROBIOLOGY-SGM, Vol: 150, Pages: 1079-1084, ISSN: 1350-0872

Journal article

Beddek AJ, Sheehan BJ, Bossé JT, Rycroft AN, Kroll JS, Langford PRet al., 2004, Two TonB systems in <i>Actinobacillus pleuropneumoniae</i>:: Their roles in iron acquisition and virulence, INFECTION AND IMMUNITY, Vol: 72, Pages: 701-708, ISSN: 0019-9567

Journal article

Edwards-Jones B, Langford PR, Kroll JS, Yu Jet al., 2004, The role of the Shigella flexneri yihE gene in LPS synthesis and virulence, Microbiology, Vol: 150, Pages: 1079-1084, ISSN: 1350-0872

Previously, the authors have shown that inactivation of Shigella flexneri yihE, a gene of unknown function upstream of dsbA, which encodes a periplasmic disulphide catalyst, results in a global change of gene expression. Among the severely down-regulated genes are galETKM, suggesting that the yihE mutant, Sh54, may inefficiently produce the UDP-glucose and UDP-galactose required for LPS synthesis. This paper demonstrates that LPS synthesis in Sh54 is impaired. As a result, Sh54 is unable to polymerize host cell actin, due to aberrant localization of IcsA, or to cause keratoconjunctivitis in guinea pigs. Furthermore, Sh54 is more sensitive to some antimicrobial agents, and exhibits epithelial cytotoxicity characteristic of neither wild-type nor dsbA mutants. Supplying galETK in trans restores LPS synthesis and corrects all the defects. Hence, it is clear that the Shigella yihE gene is important not only in regulating global gene expression, as shown previously, but also in virulence through LPS synthesis via regulating the expression of the galETK operon. © 2004 SGM.

Journal article

Kelly D, Kroll JS, 2004, Encephalitis - Beyond aciclovir, HOT TOPICS IN INFECTION AND IMMUNITY IN CHILDREN, Vol: 549, Pages: 177-+, ISSN: 0065-2598

Journal article

Ison CA, Anwar N, Cole MJ, Pollard AJ, Morley SL, Fidler K, Sandiford C, Banks J, Kroll SJ, Levin Met al., 2003, Age dependence of <i>in vitro</i> survival of meningococci in whole blood during childhood, PEDIATRIC INFECTIOUS DISEASE JOURNAL, Vol: 22, Pages: 868-873, ISSN: 0891-3668

Journal article

Campos J, Aracil B, Román F, Pérez-Vázquez Met al., 2003, Molecular epidemiology of Haemophilus influenzae type b isolated from children with clinical cases of conjugate vaccine failures., J Clin Microbiol, Vol: 41, Pages: 3915-3918, ISSN: 0095-1137

We analyzed eight invasive Haemophilus influenzae strains isolated from individual children vaccinated appropriately for their ages. Five of the strains were type b and three were nontypeable strains. Children infected with nontypeable strains had a protective level of anti-H. influenzae type b antibodies, while only one of the children whose cases represented true vaccine failure did.

Journal article

Sheehan BJ, Bossé JT, Beddek AJ, Rycroft AN, Kroll JS, Langford PRet al., 2003, Identification of <i>Actinobacillus pleuropneumoniae</i> genes important for survival during infection in its natural host, INFECTION AND IMMUNITY, Vol: 71, Pages: 3960-3970, ISSN: 0019-9567

Journal article

Meats E, Feil EJ, Stringer S, Cody AJ, Goldstein R, Kroll JS, Popovic TJ, Spratt BGet al., 2003, Characterization of encapsulated and noncapsulated <i>Haemophilus influenzae</i> and determination of phylogenetic relationships by multilocus sequence typing, JOURNAL OF CLINICAL MICROBIOLOGY, Vol: 41, Pages: 1623-1636, ISSN: 0095-1137

Journal article

Masignani V, Comanducci M, Giuliani MM, Bambini S, Adu-Bobie J, Aricò B, Brunelli B, Pieri A, Santini L, Savino S, Serruto D, Litt D, Kroll S, Welsch JA, Granoff DM, Rappuoli R, Pizza Met al., 2003, Vaccination against <i>Neisseria meningitidis</i> using three variants of the lipoprotein GNA1870, JOURNAL OF EXPERIMENTAL MEDICINE, Vol: 197, Pages: 789-799, ISSN: 0022-1007

Journal article

Dunn KLR, Farrant JL, Langford PR, Kroll JSet al., 2003, Bacterial [Cu,Zn]-cofactored superoxide dismutase protects opsonized, encapsulated <i>Neisseria meningitidis</i> from phagocytosis by human monocytes/macrophages, INFECTION AND IMMUNITY, Vol: 71, Pages: 1604-1607, ISSN: 0019-9567

Journal article

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