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McEvoy B, Lynch M, Rowan NJ. Opportunities for the application of real-time bacterial cell analysis using flow cytometry for the advancement of sterilization microbiology. J Appl Microbiol 2020; 130:1794-1812. [PMID: 33155740 DOI: 10.1111/jam.14876] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Revised: 09/10/2020] [Accepted: 09/21/2020] [Indexed: 01/11/2023]
Abstract
Medical devices provide critical care and diagnostic applications through patient contact. Sterility assurance level (SAL) may be defined as the probability of a single viable micro-organism occurring on an item after a sterilization process. Sterilization microbiology often relies upon using an overkill validation method where a 12-log reduction in recalcitrant bacterial endospore population occurs during the process that exploits conventional laboratory-based culture media for enumeration. This timely review explores key assumptions underpinning use of conventional culture-based methods in sterilization microbiology. Consideration is given to how such methods may limit the ability to fully appreciate the inactivation kinetics of a sterilization process such as vaporized hydrogen peroxide (VH2O2) sterilization, and consequently design efficient sterilization processes. Specific use of the real-time flow cytometry (FCM) is described by way of elucidating the practical relevance of these limitation factors with implications and opportunities for the sterilization industry discussed. Application of FCM to address these culture-based limitation factors will inform real-time kinetic inactivation modelling and unlock potential to embrace emerging opportunities for pharma, medical device and sterilization industries including potentially disruptive applications that may involve reduced usage of sterilant.
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Molloy OE, Malara A, Hassan J, Lynch M, Clowry J, Hedman K, De Gascun CF, Kirby B. The prevalence of Human polyomavirus 2 (HPyV2) antibody positivity in psoriasis patients. J Clin Virol 2020; 127:104368. [DOI: 10.1016/j.jcv.2020.104368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 04/07/2020] [Accepted: 04/09/2020] [Indexed: 11/24/2022]
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Boggs JME, Griffin L, Ahmad K, Hackett C, Ramsay B, Lynch M. A retrospective review of pregnancies on biologics for the treatment of dermatological conditions. Clin Exp Dermatol 2020; 45:880-883. [PMID: 32359186 DOI: 10.1111/ced.14263] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2019] [Revised: 04/01/2020] [Accepted: 04/21/2020] [Indexed: 01/23/2023]
Abstract
Psoriasis often first presents in young adulthood, with the average age of diagnosis in women being 28 years, thus in the prime reproductive years. In addition, approximately 50% of pregnancies worldwide are unplanned. Although biologic therapies have revolutionized the treatment of moderate-to-severe psoriasis, there are no controlled studies of biologics in pregnant women. The increasing use of these agents in women of childbearing age highlights the need to further assess their safety during pregnancy. Postmarketing experience regarding the safety of these drugs is accumulating and being published, with largely reassuring results. We present our real-world experience of 17 pregnancies occurring in women on treatment with biologic agents for dermatological conditions to further add to the body of knowledge.
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Webb AR, Coward L, Soh L, Waugh L, Parsons L, Lynch M, Stokan L, Borland R. Smoking cessation in elective surgical patients offered free nicotine patches at listing: a pilot study. Anaesthesia 2019; 75:171-178. [DOI: 10.1111/anae.14863] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/28/2019] [Indexed: 11/27/2022]
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Ganier C, Harun N, Philippeos C, Ali S, Du X, Belokhvostova D, Watt F, Lynch M. 210 Three-dimensional models of human skin at single-cell resolution in health and disease. J Invest Dermatol 2019. [DOI: 10.1016/j.jid.2019.07.211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Philippeos C, Telerman S, Oules B, Oliveira Pisco A, Shaw T, Elgueta R, Lombardi G, Driskell R, Soldin M, Lynch M, Watt F. 660 Dermal fibroblast subpopulations as a potential cell therapy for promoting scar-free wound healing and resolving scar formation. J Invest Dermatol 2019. [DOI: 10.1016/j.jid.2019.07.665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Lynch M, Malara A, Timoney I, Ahern T, Awdeh F, Sweeney C, Galligan M, Venckens S, Kelly G, Hughes R, O Apos Shea D, Doran P, Kirby B. Dipeptidyl Peptidase-4 Inhibition in Psoriasis Patients with Diabetes: A Double-Blind Randomized Controlled Trial. Dermatology 2019; 237:66-69. [PMID: 31473741 DOI: 10.1159/000502130] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Accepted: 07/16/2019] [Indexed: 11/19/2022] Open
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Bakhbakhi D, Siassakos D, Lynch M, Timlin L, Storey C, Heazell A, Burden C. PARENTS 2 study: consensus report for parental engagement in the perinatal mortality review process. ULTRASOUND IN OBSTETRICS & GYNECOLOGY : THE OFFICIAL JOURNAL OF THE INTERNATIONAL SOCIETY OF ULTRASOUND IN OBSTETRICS AND GYNECOLOGY 2019; 54:215-224. [PMID: 30294945 PMCID: PMC6772129 DOI: 10.1002/uog.20139] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Revised: 09/06/2018] [Accepted: 09/18/2018] [Indexed: 05/05/2023]
Abstract
OBJECTIVE The PARENTS 1 study (Parents' Active Role and ENgagement in The review of their Stillbirth/perinatal death) found that parents would endorse the opportunity to give feedback into the perinatal mortality review (PNMR) process. In subsequent focus groups, healthcare professionals were positive about parental engagement, although they considered that there may be significant challenges. The objective of this study was to develop core principles and recommendations for parental engagement in PNMR in the UK. METHODS A two-round Delphi technique was followed to reach consensus on core principles for parental engagement in the PNMR process; Round 1 included a national consensus workshop and Round 2 an online questionnaire. The consensus meeting was attended by a national panel of stakeholders (clinical and academic experts, parent advocates, managers and commissioners) in stillbirth and neonatal and bereavement care. To develop recommendations for parental engagement, participants discussed four key areas comprising: communication with parents, including receiving feedback; the format of the PNMR meeting; the parental engagement pathway; and challenging aspects of engaging with parents in reviews. Content analysis was conducted to generate recommendations from the meeting for a subsequent anonymous web-based survey. Attendees of the consensus workshop and members of the PARENTS 2 Project Advisory Board were asked to rank recommendations using a 9-point Likert scale from 1 (not important) to 9 (critically important). It had been agreed a priori, in compliance with established Grading of Recommendations, Assessment, Development and Evaluation (GRADE) criteria, that 'consensus' would be achieved if over 70% of participants scored the principle as 'critical' (score of 7-9) and fewer than 15% scored the principle as 'not important' (score of 1-3). Principles for which consensus was achieved were included in the core recommendations. RESULTS Of the 29 invited stakeholders, 22 participated in the consensus meeting and 25 (86% response rate) in the subsequent online questionnaire in June 2017. Consensus was agreed on 12 core principles. Of the 25 participants, 96% agreed that a face-to-face explanation of the PNMR process was of critical importance, 72% considered that parents should be offered the opportunity to nominate a suitable advocate, 92% believed that responses to parents' comments should be formally documented, 96% indicated that it was vital for action plans to be translated into lessons learnt and that this process should be monitored, and 100% of stakeholders voted that a plain-English summary should be produced for the parents following the meeting. There was good agreement on a further seven principles. CONCLUSIONS Key national stakeholders were unanimously supportive of parental engagement in the PNMR process and agreed on core principles to make this process feasible, meaningful and robust. A 6-month pilot of parental engagement in the PNMR process (PARENTS 2 study) in two UK units took place after the consensus on core principles. In collaboration with the National Perinatal Epidemiology Unit, the findings will inform the national standardized PNMR tool. © 2018 The Authors. Ultrasound in Obstetrics & Gynecology published by John Wiley & Sons Ltd on behalf of the International Society of Ultrasound in Obstetrics and Gynecology.
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Kirby B, Lynch M. Adipokines and psoriasis: the obesity link. THE BRITISH JOURNAL OF DERMATOLOGY 2019; 179:239. [PMID: 30141537 DOI: 10.1111/bjd.16803] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Das K, Lynch M. Atellica UAS 800 urine sediment analyzer compatibility with commercial quality control materials and urine preservative tubes. Clin Chim Acta 2019. [DOI: 10.1016/j.cca.2019.03.1016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Boyle E, McHugh SM, Elmallah A, Lynch M, McGuire D, Ahmed Z, Canning C, Colgan MP, O’Neill SM, O’Callaghan A, Martin Z, Madhavan P. Explant of aortic stent grafts following endovascular aneurysm repair. Vascular 2019; 27:487-494. [DOI: 10.1177/1708538119832727] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background Failure of endovascular aneurysm repair may require explant of the stent graft in a subset of patients. We sought to assess outcomes in a cohort of patients undergoing explant of endovascular aneurysm repair in both emergency and elective settings. Methods Patients undergoing explant of endovascular aneurysm repair were identified from a prospectively maintained database, with additional information obtained through retrospective analysis of medical records. Results Over a 21-year period, 1997–2018 (May), there were 597 endovascular aneurysm repair procedures performed in our institution for abdominal aortic aneurysm. There were 19 endovascular aneurysm repair explants; five of these were referrals from other vascular centres. The median age was 73 years (range 46–81). The median length of time from insertion to explant was 39.2 months (range 0–153). Indications for elective explant were type Ia endoleak (n = 4), type 1b endoleak (n = 1), type II endoleak with increasing sac size (n = 1), type I/III endoleak (n = 1), type IV endoleak (n = 1), and increasing sac size without evident endoleak (type V, n = 2). The remaining nine cases were emergency procedures, with four patients presenting with rupture post endovascular aneurysm repair, four patients presenting with acute stent thrombosis, of which one also had a type 1a endoleak and one aorto-enteric fistula. There were no mortalities in the elective group and three mortalities in the emergency group (0 vs 33.3%, p = 0.087). Overall 30-day mortality was 15.8% Conclusion Explant of aortic stent grafts can be associated with high mortality and morbidity rates, especially in the emergent setting. Patient and device selection and post-operative surveillance remain vitally important to optimise outcomes post endovascular aneurysm repair.
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Squiers L, Lynch M, Dolina S, Ray S, Kelly B, Herrington J, Turner M, Chawla D, Becker-Dreps S, Stamm L, McCormack L. Zika and travel in the news: a content analysis of US news stories during the outbreak in 2016-2017. Public Health 2019; 168:164-167. [PMID: 30772009 DOI: 10.1016/j.puhe.2018.12.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Revised: 11/08/2018] [Accepted: 12/02/2018] [Indexed: 11/24/2022]
Abstract
OBJECTIVES This study aimed to understand what information the US media communicated about Zika virus (ZIKV) and travel in 2016 and 2017. STUDY DESIGN We conducted a content analysis of news coverage about ZIKV and travel from April 5, 2016 to March 31, 2017. METHODS We obtained a stratified, random sample of English language, US print newspaper and television news coverage about ZIKV and travel. We developed a coding scheme to assess key messages in the news, including how ZIKV is transmitted, the symptoms and outcomes of ZIKV infection, and recommended prevention behaviors. RESULTS Almost all news stories mentioned mosquito-borne transmission (96.8%) and just over half mentioned sexual transmission (55.3%). News stories were more likely to talk about ZIKV outcomes (78.8%) than ZIKV symptoms (40.6%). However, outcomes affecting babies were mentioned more frequently than outcomes affecting adults. Recommendations included a wide array of protective behaviors, such as delaying or avoiding travel (77.6%) and using mosquito repellent (41.0%). However, few studies (10.9%) mentioned barriers to practicing ZIKV prevention behaviors. CONCLUSIONS Public health organizations and professionals can use these findings to help improve communication about future outbreaks of mosquito-borne illnesses. We also recommend conducting real-time monitoring of news media and frequent content analysis of news stories to ensure coverage provides the information the public needs.
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McCarthy S, McMenamin ME, Heffron CCBB, Ipadeola O, Hackett C, Lynch M. A solitary chest nodule. Clin Exp Dermatol 2018; 44:667-669. [PMID: 30430611 DOI: 10.1111/ced.13827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/10/2018] [Indexed: 11/28/2022]
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Marino R, Lynch M, Suffoletto B. 390 Increasing Utilization of Take-Home Naloxone Program for At-Risk Emergency Department Patients Using Computerized Clinical Decision Support. Ann Emerg Med 2018. [DOI: 10.1016/j.annemergmed.2018.08.395] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Shakespeare C, Merriel A, Bakhbakhi D, Baneszova R, Barnard K, Lynch M, Storey C, Blencowe H, Boyle F, Flenady V, Gold K, Horey D, Mills T, Siassakos D. Parents' and healthcare professionals' experiences of care after stillbirth in low- and middle-income countries: a systematic review and meta-summary. BJOG 2018; 126:12-21. [PMID: 30099831 DOI: 10.1111/1471-0528.15430] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/29/2018] [Indexed: 11/29/2022]
Abstract
BACKGROUND Stillbirth has a profound impact on women, families, and healthcare workers. The burden is highest in low- and middle-income countries (LMICs). There is need for respectful and supportive care for women, partners, and families after bereavement. OBJECTIVE To perform a qualitative meta-summary of parents' and healthcare professionals' experiences of care after stillbirth in LMICs. SEARCH STRATEGY Search terms were formulated by identifying all synonyms, thesaurus terms, and variations for stillbirth. Databases searched were AMED, EMBASE, MEDLINE, PsychINFO, BNI, CINAHL. SELECTION CRITERIA Qualitative, quantitative, and mixed method studies that addressed parents' or healthcare professionals' experience of care after stillbirth in LMICs. DATA COLLECTION AND ANALYSIS Studies were screened, and data extracted in duplicate. Data were analysed using the Sandelowski meta-summary technique that calculates frequency and intensity effect sizes (FES/IES). MAIN RESULTS In all, 118 full texts were screened, and 34 studies from 17 countries were included. FES range was 15-68%. Most studies had IES 1.5-4.5. Women experience a broad range of manifestations of grief following stillbirth, which may not be recognised by healthcare workers or in their communities. Lack of recognition exacerbates negative experiences of stigmatisation, blame, devaluation, and loss of social status. Adequately developed health systems, with trained and supported staff, are best equipped to provide the support and information that women want after stillbirth. CONCLUSIONS Basic interventions could have an immediate impact on the experiences of women and their families after stillbirth. Examples include public education to reduce stigma, promoting the respectful maternity care agenda, and investigating stillbirth appropriately. TWEETABLE ABSTRACT Reducing stigma, promoting respectful care and investigating stillbirth have a positive impact after stillbirth for women and families in LMICs.
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Malara A, Hughes R, Jennings L, Sweeney CM, Lynch M, Awdeh F, Timoney I, Tobin AM, Lynam-Loane K, Tobin L, Hogan A, O'Shea D, Kirby B. Adipokines are dysregulated in patients with hidradenitis suppurativa. Br J Dermatol 2018; 178:792-793. [PMID: 28834543 DOI: 10.1111/bjd.15904] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Ghorani E, Rosenthal R, McGranahan N, Reading JL, Lynch M, Peggs KS, Swanton C, Quezada SA. Differential binding affinity of mutated peptides for MHC class I is a predictor of survival in advanced lung cancer and melanoma. Ann Oncol 2018; 29:271-279. [PMID: 29361136 PMCID: PMC5834109 DOI: 10.1093/annonc/mdx687] [Citation(s) in RCA: 88] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Background Cancer mutations generate novel (neo-)peptides recognised by T cells, but the determinants of recognition are not well characterised. The difference in predicted class I major histocompatibility complex (MHC-I) binding affinity between wild-type and corresponding mutant peptides (differential agretopicity index; DAI) may reflect clinically relevant cancer peptide immunogenicity. Our aim was to explore the relationship between DAI, measures of immune infiltration and patient outcomes in advanced cancer. Patients and methods Cohorts of patients with advanced non-small-cell lung cancer (NSCLC; LUAD, n = 66) and melanoma (SKCM, n = 72) were obtained from The Cancer Genome Atlas. Three additional cohorts of immunotherapy treated patients with advanced melanoma (total n = 131) and NSCLC (n = 31) were analysed. Neopeptides and their clonal status were defined using genomic data. MHC-I binding affinity was predicted for each neopeptide and DAI values summarised as the sample mean DAI. Correlations between mean DAI and markers of immune activity were evaluated using measures of lymphocyte infiltration and immune gene expression. Results In univariate and multivariate analyses, mean DAI significantly correlated with overall survival in 3/5 cohorts, with evidence of superiority over nonsynonymous mutational and neoantigen burden. In these cohorts, the effect was seen for mean DAI of clonal but not subclonal peptides. In SKCM, the association between mean DAI and survival bordered significance (P = 0.068), reaching significance in an immunotherapy-treated melanoma cohort (P = 0.003). Mean DAI but not mutational nor neoantigen burden was positively correlated with independently derived markers of immune infiltration in both SKCM (P = 0.027) and LUAD (P = 0.024). Conclusions The association between mean DAI, survival and measures of immune activity support the hypothesis that DAI is a determinant of cancer peptide immunogenicity. Investigation of DAI as a marker of immunologically relevant peptides in further datasets and future clinical studies of neoantigen based immunotherapies is warranted.
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Alwan W, Lynch M, McFadden J, White I, Banerjee P. Patch testing in patients with psoriasis: results of a 30-year retrospective study. Br J Dermatol 2017; 178:559-560. [DOI: 10.1111/bjd.15730] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Roche L, Lynch M, Ahmad K, Hackett C, Ramsay B. Lymphopenia and fumaric acid esters for psoriasis: a retrospective case series prompted by the European Medicines Agency's Pharmacovigilance Risk Assessment Committee (PRAC) recommendations. Clin Exp Dermatol 2017; 43:72-75. [DOI: 10.1111/ced.13277] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/05/2017] [Indexed: 11/28/2022]
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Haddad R, Blumenschein G, Fayette J, Guigay J, Colevas A, Licitra L, Kasper S, Vokes E, Worden F, Saba N, Tahara M, Concha-Benavente F, Monga M, Lynch M, Li L, Shaw J, Gillison M, Harrington K, Ferris R. Treatment beyond progression with nivolumab in patients with recurrent or metastatic (R/M) squamous cell carcinoma of the head and neck (SCCHN) in the phase 3 checkmate 141 study: A biomarker analysis and updated clinical outcomes. Ann Oncol 2017. [DOI: 10.1093/annonc/mdx374.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Licitra L, Ferris R, Blumenschein G, Harrington K, Guigay J, Kasper S, Saba N, Haddad R, Kiyota N, Monga M, Lynch M, Li L, Gillison M, Fayette J. Nivolumab vs investigator’s choice (IC) in patients with recurrent or metastatic (R/M) squamous cell carcinoma of the head and neck (SCCHN): treatment effect on clinical outcomes by best overall response in checkmate 141. Ann Oncol 2017. [DOI: 10.1093/annonc/mdx374.012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Timoney I, Lynch M, Timoney L, Feeney E, Kirby B. Mycobacterium marinum infection contracted from seaweed wrap in a psoriasis patient undergoing treatment with adalimumab. Dermatol Online J 2017; 23:13030/qt7zx7m93c. [PMID: 29469748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Accepted: 08/18/2017] [Indexed: 06/08/2023] Open
Abstract
We report a patient with psoriasis who developed Mycobacterium marinum (M. marinum) infection after seven years of treatment with adalimumab, a human anti-TNF (tumor necrosis factor) monoclonal antibody. TNF is a pro-inflammatory cytokine that plays a central role in the pathogenesis of psoriasis and a number of other immune-mediated inflammatory diseases. TNF plays an important role in granuloma formation and host defense against mycobacterial infections. Several cases of atypical mycobacterial infections in patients on TNF inhibitors have been reported. To our knowledge, this is the second reported case of M. marinum infection in a patient on adalimumab for the treatment of psoriasis.
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Lynch M, Ahern T, Sweeney CM, Malara A, Tobin AM, O'Shea D, Kirby B. Adipokines, psoriasis, systemic inflammation, and endothelial dysfunction. Int J Dermatol 2017; 56:1103-1118. [DOI: 10.1111/ijd.13699] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Revised: 05/06/2017] [Accepted: 06/09/2017] [Indexed: 12/11/2022]
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Gabriel W, Lynch M, Bürger R. MULLER'S RATCHET AND MUTATIONAL MELTDOWNS. Evolution 2017; 47:1744-1757. [PMID: 28567994 DOI: 10.1111/j.1558-5646.1993.tb01266.x] [Citation(s) in RCA: 165] [Impact Index Per Article: 23.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/1992] [Accepted: 04/06/1993] [Indexed: 11/28/2022]
Abstract
We extend our earlier work on the role of deleterious mutations in the extinction of obligately asexual populations. First, we develop analytical models for mutation accumulation that obviate the need for time-consuming computer simulations in certain ranges of the parameter space. When the number of mutations entering the population each generation is fairly high, the number of mutations per individual and the mean time to extinction can be predicted using classical approaches in quantitative genetics. However, when the mutation rate is very low, a fixation-probability approach is quite effective. Second, we show that an intermediate selection coefficient (s) minimizes the time to extinction. The critical value of s can be quite low, and we discuss the evolutionary implications of this, showing that increased sensitivity to mutation and loss of capacity for DNA repair can be selectively advantageous in asexual organisms. Finally, we consider the consequences of the mutational meltdown for the extinction of mitochondrial lineages in sexual species.
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Lynch M, Roche L, Horgan M, Ahmad K, Hackett C, Ramsay B. Peritoneal tuberculosis in the setting of ustekinumab treatment for psoriasis. JAAD Case Rep 2017; 3:230-232. [PMID: 28443318 PMCID: PMC5394192 DOI: 10.1016/j.jdcr.2017.02.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
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