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Eastwood SV, Hemani G, Watkins SH, Scally A, Davey Smith G, Chaturvedi N. Ancestry, ethnicity, and race: explaining inequalities in cardiometabolic disease. Trends Mol Med 2024:S1471-4914(24)00090-X. [PMID: 38677980 DOI: 10.1016/j.molmed.2024.04.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Revised: 03/30/2024] [Accepted: 04/03/2024] [Indexed: 04/29/2024]
Abstract
Population differences in cardiometabolic disease remain unexplained. Misleading assumptions over genetic explanations are partly due to terminology used to distinguish populations, specifically ancestry, race, and ethnicity. These terms differentially implicate environmental and biological causal pathways, which should inform their use. Genetic variation alone accounts for a limited fraction of population differences in cardiometabolic disease. Research effort should focus on societally driven, lifelong environmental determinants of population differences in disease. Rather than pursuing population stratifiers to personalize medicine, we advocate removing socioeconomic barriers to receipt of and adherence to healthcare interventions, which will have markedly greater impact on improving cardiometabolic outcomes. This requires multidisciplinary collaboration and public and policymaker engagement to address inequalities driven by society rather than biology per se.
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Affiliation(s)
- Sophie V Eastwood
- MRC Unit for Lifelong Health and Ageing at UCL Population Sciences and Experimental Medicine, Institute of Cardiovascular Sciences Faculty of Population Health Sciences, University College London, London, UK
| | - Gibran Hemani
- Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, UK; MRC Integrative Epidemiology Unit, Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, UK
| | - Sarah H Watkins
- Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, UK; MRC Integrative Epidemiology Unit, Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, UK
| | - Aylwyn Scally
- Department of Genetics, University of Cambridge, Downing Street, Cambridge, UK
| | - George Davey Smith
- Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, UK; MRC Integrative Epidemiology Unit, Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, UK
| | - Nishi Chaturvedi
- MRC Unit for Lifelong Health and Ageing at UCL Population Sciences and Experimental Medicine, Institute of Cardiovascular Sciences Faculty of Population Health Sciences, University College London, London, UK.
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O'Leary AB, Scally A, Moore N, Maiorino-Groeneveld C, McEntee MF. Radiographers' knowledge and attitudes toward dementia. Radiography (Lond) 2023; 29:456-461. [PMID: 36827791 DOI: 10.1016/j.radi.2023.02.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Revised: 01/19/2023] [Accepted: 02/08/2023] [Indexed: 02/24/2023]
Abstract
INTRODUCTION Dementia is a syndrome associated with a decline in brain function, impacting how we speak, think, feel, and behave. Misunderstanding of dementia and how it affects patients and their carers is common. There is limited research on how radiographers provide adequate care to those with dementia. Radiographers with knowledge and positive attitudes can reduce stigma and fear, improving the quality of care. This study aimed to assess radiographers' knowledge and attitudes towards dementia. METHODS A cohort of registered radiographers in Ireland participated in an online survey. Two pre-existing validated questionnaires: The Alzheimer's Disease Knowledge Scale (ADKS) and the Dementia Attitudes Scale (DAS), assessed radiographers' knowledge and attitudes towards dementia and people with dementia. Scores were compared across variables such as gender, age, grade, qualification, work setting, and the number of years qualified. RESULTS A total of 123 radiographers responded. Knowledge scores did not significantly differ across demographic groups (p > 0.05). Total knowledge scores ranged from 60% to 100%. Total attitude scores ranged from 50% to 100%. Participants with a BSc, MSc, and other post-graduate degrees scored higher on the attitude scale than those with a diploma qualification (p = 0.027). Those with less than 20 years' experience scored higher than those with more. Knowledge had little correlation with attitude (r = 0.0522; p = 0.5667). CONCLUSION Findings indicate variations in attitudes linked to age and experience, and some misconceptions can be observed across varying groups. Interventions to improve attitudes and raise awareness are needed. IMPLICATIONS FOR PRACTICE There is a need for further research and education on dementia care in the imaging department. We have identified areas requiring further education.
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Affiliation(s)
- A B O'Leary
- The Discipline of Medical Imaging and Radiation Therapy, Brookfield Science Building, University College Cork, College Road, Cork, T12 AK54, Ireland
| | - A Scally
- The Discipline of Medical Imaging and Radiation Therapy, Brookfield Science Building, University College Cork, College Road, Cork, T12 AK54, Ireland
| | - N Moore
- The Discipline of Medical Imaging and Radiation Therapy, Brookfield Science Building, University College Cork, College Road, Cork, T12 AK54, Ireland
| | - C Maiorino-Groeneveld
- The Discipline of Medical Imaging and Radiation Therapy, Brookfield Science Building, University College Cork, College Road, Cork, T12 AK54, Ireland
| | - M F McEntee
- The Discipline of Medical Imaging and Radiation Therapy, Brookfield Science Building, University College Cork, College Road, Cork, T12 AK54, Ireland.
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Maskalenka K, Alagöz G, Krueger F, Wright J, Rostovskaya M, Nakhuda A, Bendall A, Krueger C, Walker S, Scally A, Rugg-Gunn PJ. NANOGP1, a tandem duplicate of NANOG, exhibits partial functional conservation in human naïve pluripotent stem cells. Development 2023; 150:286291. [PMID: 36621005 PMCID: PMC10110494 DOI: 10.1242/dev.201155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Accepted: 12/16/2022] [Indexed: 01/10/2023]
Abstract
Gene duplication events can drive evolution by providing genetic material for new gene functions, and they create opportunities for diverse developmental strategies to emerge between species. To study the contribution of duplicated genes to human early development, we examined the evolution and function of NANOGP1, a tandem duplicate of the transcription factor NANOG. We found that NANOGP1 and NANOG have overlapping but distinct expression profiles, with high NANOGP1 expression restricted to early epiblast cells and naïve-state pluripotent stem cells. Sequence analysis and epitope-tagging revealed that NANOGP1 is protein coding with an intact homeobox domain. The duplication that created NANOGP1 occurred earlier in primate evolution than previously thought and has been retained only in great apes, whereas Old World monkeys have disabled the gene in different ways, including homeodomain point mutations. NANOGP1 is a strong inducer of naïve pluripotency; however, unlike NANOG, it is not required to maintain the undifferentiated status of human naïve pluripotent cells. By retaining expression, sequence and partial functional conservation with its ancestral copy, NANOGP1 exemplifies how gene duplication and subfunctionalisation can contribute to transcription factor activity in human pluripotency and development.
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Affiliation(s)
| | - Gökberk Alagöz
- Department of Genetics, University of Cambridge, Cambridge CB2 3EH, UK
| | - Felix Krueger
- Bioinformatics Group, Babraham Institute, Cambridge CB22 3AT, UK
| | - Joshua Wright
- Epigenetics Programme, Babraham Institute, Cambridge CB22 3AT, UK
| | | | - Asif Nakhuda
- Gene Targeting Facility, Babraham Institute, Cambridge CB22 3AT, UK
| | - Adam Bendall
- Epigenetics Programme, Babraham Institute, Cambridge CB22 3AT, UK
| | - Christel Krueger
- Epigenetics Programme, Babraham Institute, Cambridge CB22 3AT, UK
| | - Simon Walker
- Imaging Facility, Babraham Institute, Cambridge CB22 3AT, UK
| | - Aylwyn Scally
- Department of Genetics, University of Cambridge, Cambridge CB2 3EH, UK
| | - Peter J Rugg-Gunn
- Epigenetics Programme, Babraham Institute, Cambridge CB22 3AT, UK
- Wellcome-MRC Cambridge Stem Cell Institute, Cambridge CB2 0AW, UK
- Centre for Trophoblast Research, University of Cambridge, Cambridge CB2 3EG, UK
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Keane E, Moore N, Leamy B, Scally A, McEntee MF. Identifying barriers to Irish traveller women attending breast screening. Radiography (Lond) 2021; 28:348-352. [PMID: 34916128 DOI: 10.1016/j.radi.2021.11.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 11/27/2021] [Accepted: 11/30/2021] [Indexed: 11/28/2022]
Abstract
INTRODUCTION Breast cancer is one of the most prevalent cancers in women, however Irish Traveller women have lower breast screening rates than that of the general population. This work aims to address the gap in knowledge of Irish Traveller womens' perceptions of breast screening and the perceived barriers and enablers to attendance. METHODS This phenomenological qualitative study involves interviews with Irish Traveller women and Health Care Professionals and discusses the incentives and barriers to attending breast screening mammography in Ireland. The work investigated attitudes and decision making amongst the Irish Traveller women across breast screening and breast health. The research investigated the participants knowledge, experience and opinions about the topic of Irish Traveller womens' attendance at BreastCheck and breast health RESULTS: Influences that create barriers to breast screening for Irish Traveller women include inequality and family/community support, fear, literacy and education, embarrassment and the health care professional, stress and appointment suitability. Findings also demonstrate inadequate data and information is available in Ireland regarding Irish Traveller women attending breast screening. CONCLUSION Irish Traveller women face several influences when it comes to attending breast screening. The existing Irish national breast screening programme provides a health promotion service however, it is impossible to assess poor attendance at screening without the presence of an ethnic identifier. It would be very beneficial for screening promotion to record the ethnicity of attendees for statistical progress. This would benefit Irish Traveller women by recording the progress of attendance in the breast screening programme and creating a need for awareness and education within the annual reports. IMPLICATIONS FOR PRACTICE Creating awareness and educating Irish Traveller women about the breast screening programme may remove barriers and lead to improved attendance rates.
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Affiliation(s)
- E Keane
- Medical Imaging and Radiation Therapy, School of Medicine, UG Assert, Brookfield Health Sciences, University College Cork, T12 AK54, Ireland.
| | - N Moore
- Medical Imaging and Radiation Therapy, School of Medicine, UG Assert, Brookfield Health Sciences, University College Cork, T12 AK54, Ireland.
| | - B Leamy
- Department of Radiology, Cork University Hospital, Wilton Road, Cork, T12 DFK4, Ireland.
| | - A Scally
- Medical Imaging and Radiation Therapy, School of Medicine, UG Assert, Brookfield Health Sciences, University College Cork, T12 AK54, Ireland.
| | - M F McEntee
- Medical Imaging and Radiation Therapy, School of Medicine, UG Assert, Brookfield Health Sciences, University College Cork, T12 AK54, Ireland.
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Scally A. Complexity in human ancestral demography. J Anthropol Sci 2021; 99:179-182. [PMID: 34601463 DOI: 10.4436/jass.99009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Affiliation(s)
- Aylwyn Scally
- Department of Genetics, University of Cambridge, Downing St, Cambridge, CB2 3EH, UK,
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Walker CR, Scally A, De Maio N, Goldman N. Short-range template switching in great ape genomes explored using pair hidden Markov models. PLoS Genet 2021; 17:e1009221. [PMID: 33651813 PMCID: PMC7954356 DOI: 10.1371/journal.pgen.1009221] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 03/12/2021] [Accepted: 02/10/2021] [Indexed: 12/14/2022] Open
Abstract
Many complex genomic rearrangements arise through template switch errors, which occur in DNA replication when there is a transient polymerase switch to an alternate template nearby in three-dimensional space. While typically investigated at kilobase-to-megabase scales, the genomic and evolutionary consequences of this mutational process are not well characterised at smaller scales, where they are often interpreted as clusters of independent substitutions, insertions and deletions. Here we present an improved statistical approach using pair hidden Markov models, and use it to detect and describe short-range template switches underlying clusters of mutations in the multi-way alignment of hominid genomes. Using robust statistics derived from evolutionary genomic simulations, we show that template switch events have been widespread in the evolution of the great apes’ genomes and provide a parsimonious explanation for the presence of many complex mutation clusters in their phylogenetic context. Larger-scale mechanisms of genome rearrangement are typically associated with structural features around breakpoints, and accordingly we show that atypical patterns of secondary structure formation and DNA bending are present at the initial template switch loci. Our methods improve on previous non-probabilistic approaches for computational detection of template switch mutations, allowing the statistical significance of events to be assessed. By specifying realistic evolutionary parameters based on the genomes and taxa involved, our methods can be readily adapted to other intra- or inter-species comparisons. DNA replication is an imperfect process which causes the mutations that give rise to genetic diversity during the evolution of genomes. While many mutations are independent, single-nucleotide substitutions or small insertions and deletions, some mutations arise as nonindependent clusters of substitutions and larger scale chromosomal rearrangements. Large-scale rearrangements (also called structural variants) in particular can have a profound impact on genome evolution and contribute to both germline and somatic disease in humans. The replication-based mechanisms underlying structural variation typically involve a polymerase switch event in which a large segment of DNA is copied using a template from an alternate location in the genome. Methods for identifying these template switch mutations lack the power to detect smaller scale rearrangements which can arise through the same replication-based pathways. Here we outline a model which can detect and assess the statistical significance of such small-scale template switches within their evolutionary context. We show that these events are widespread in the evolution of great apes and that the genomic features associated with these small-scale rearrangements are similar to those of large-scale structural variants.
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Affiliation(s)
- Conor R. Walker
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Genome Campus, Hinxton, United Kingdom
- Department of Genetics, University of Cambridge, Cambridge, United Kingdom
| | - Aylwyn Scally
- Department of Genetics, University of Cambridge, Cambridge, United Kingdom
| | - Nicola De Maio
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Genome Campus, Hinxton, United Kingdom
| | - Nick Goldman
- European Molecular Biology Laboratory, European Bioinformatics Institute (EMBL-EBI), Wellcome Genome Campus, Hinxton, United Kingdom
- * E-mail:
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Bergström A, McCarthy SA, Hui R, Almarri MA, Ayub Q, Danecek P, Chen Y, Felkel S, Hallast P, Kamm J, Blanché H, Deleuze JF, Cann H, Mallick S, Reich D, Sandhu MS, Skoglund P, Scally A, Xue Y, Durbin R, Tyler-Smith C. Insights into human genetic variation and population history from 929 diverse genomes. Science 2020; 367:eaay5012. [PMID: 32193295 PMCID: PMC7115999 DOI: 10.1126/science.aay5012] [Citation(s) in RCA: 341] [Impact Index Per Article: 85.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Accepted: 02/04/2020] [Indexed: 12/17/2022]
Abstract
Genome sequences from diverse human groups are needed to understand the structure of genetic variation in our species and the history of, and relationships between, different populations. We present 929 high-coverage genome sequences from 54 diverse human populations, 26 of which are physically phased using linked-read sequencing. Analyses of these genomes reveal an excess of previously undocumented common genetic variation private to southern Africa, central Africa, Oceania, and the Americas, but an absence of such variants fixed between major geographical regions. We also find deep and gradual population separations within Africa, contrasting population size histories between hunter-gatherer and agriculturalist groups in the past 10,000 years, and a contrast between single Neanderthal but multiple Denisovan source populations contributing to present-day human populations.
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Affiliation(s)
- Anders Bergström
- Wellcome Sanger Institute, Hinxton CB10 1SA, UK.
- The Francis Crick Institute, London NW1 1AT, UK
| | - Shane A McCarthy
- Wellcome Sanger Institute, Hinxton CB10 1SA, UK
- Department of Genetics, University of Cambridge, Cambridge CB2 3EH, UK
| | - Ruoyun Hui
- Department of Genetics, University of Cambridge, Cambridge CB2 3EH, UK
- McDonald Institute for Archaeological Research, University of Cambridge, Cambridge CB2 3ER, UK
| | | | - Qasim Ayub
- Wellcome Sanger Institute, Hinxton CB10 1SA, UK
- Monash University Malaysia Genomics Facility, Tropical Medicine and Biology Multidisciplinary Platform, 47500 Bandar Sunway, Malaysia
- School of Science, Monash University Malaysia, 47500 Bandar Sunway, Malaysia
| | | | - Yuan Chen
- Wellcome Sanger Institute, Hinxton CB10 1SA, UK
| | - Sabine Felkel
- Wellcome Sanger Institute, Hinxton CB10 1SA, UK
- Institute of Animal Breeding and Genetics, University of Veterinary Medicine Vienna, Vienna 1210, Austria
| | - Pille Hallast
- Wellcome Sanger Institute, Hinxton CB10 1SA, UK
- Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu 50411, Estonia
| | - Jack Kamm
- Wellcome Sanger Institute, Hinxton CB10 1SA, UK
- Department of Genetics, University of Cambridge, Cambridge CB2 3EH, UK
- Chan Zuckerberg Biohub, San Francisco, CA 94158, USA
| | - Hélène Blanché
- Centre d'Etude du Polymorphisme Humain, Fondation Jean Dausset, 75010 Paris, France
- GENMED Labex, ANR-10-LABX-0013 Paris, France
| | - Jean-François Deleuze
- Centre d'Etude du Polymorphisme Humain, Fondation Jean Dausset, 75010 Paris, France
- GENMED Labex, ANR-10-LABX-0013 Paris, France
| | - Howard Cann
- Centre d'Etude du Polymorphisme Humain, Fondation Jean Dausset, 75010 Paris, France
| | - Swapan Mallick
- Department of Genetics, Harvard Medical School, Boston, MA 02115, USA
- Broad Institute of Harvard and MIT, Cambridge, MA 02142, USA
| | - David Reich
- Department of Genetics, Harvard Medical School, Boston, MA 02115, USA
- Broad Institute of Harvard and MIT, Cambridge, MA 02142, USA
| | - Manjinder S Sandhu
- Wellcome Sanger Institute, Hinxton CB10 1SA, UK
- Department of Medicine, University of Cambridge, Cambridge CB2 0QQ, UK
| | | | - Aylwyn Scally
- Department of Genetics, University of Cambridge, Cambridge CB2 3EH, UK
| | - Yali Xue
- Wellcome Sanger Institute, Hinxton CB10 1SA, UK
| | - Richard Durbin
- Wellcome Sanger Institute, Hinxton CB10 1SA, UK
- Department of Genetics, University of Cambridge, Cambridge CB2 3EH, UK
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Affiliation(s)
- Iain Mathieson
- Department of Genetics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
- * E-mail: (IM); (AS)
| | - Aylwyn Scally
- Department of Genetics, University of Cambridge, Cambridge, United Kingdom
- * E-mail: (IM); (AS)
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Scerri EM, Thomas MG, Manica A, Gunz P, Stock JT, Stringer C, Grove M, Groucutt HS, Timmermann A, Rightmire GP, d'Errico F, Tryon CA, Drake NA, Brooks AS, Dennell RW, Durbin R, Henn BM, Lee-Thorp J, deMenocal P, Petraglia MD, Thompson JC, Scally A, Chikhi L. Did our species evolve in subdivided populations across Africa, and Why does it matter? ACTA ACUST UNITED AC 2019. [DOI: 10.1530/ey.16.14.9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Mattle-Greminger MP, Bilgin Sonay T, Nater A, Pybus M, Desai T, de Valles G, Casals F, Scally A, Bertranpetit J, Marques-Bonet T, van Schaik CP, Anisimova M, Krützen M. Genomes reveal marked differences in the adaptive evolution between orangutan species. Genome Biol 2018; 19:193. [PMID: 30428903 PMCID: PMC6237011 DOI: 10.1186/s13059-018-1562-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Accepted: 10/09/2018] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Integrating demography and adaptive evolution is pivotal to understanding the evolutionary history and conservation of great apes. However, little is known about the adaptive evolution of our closest relatives, in particular if and to what extent adaptions to environmental differences have occurred. Here, we used whole-genome sequencing data from critically endangered orangutans from North Sumatra (Pongo abelii) and Borneo (P. pygmaeus) to investigate adaptive responses of each species to environmental differences during the Pleistocene. RESULTS Taking into account the markedly disparate demographic histories of each species after their split ~ 1 Ma ago, we show that persistent environmental differences on each island had a strong impact on the adaptive evolution of the genus Pongo. Across a range of tests for positive selection, we find a consistent pattern of between-island and species differences. In the more productive Sumatran environment, the most notable signals of positive selection involve genes linked to brain and neuronal development, learning, and glucose metabolism. On Borneo, however, positive selection comprised genes involved in lipid metabolism, as well as cardiac and muscle activities. CONCLUSIONS We find strikingly different sets of genes appearing to have evolved under strong positive selection in each species. In Sumatran orangutans, selection patterns were congruent with well-documented cognitive and behavioral differences between the species, such as a larger and more complex cultural repertoire and higher degrees of sociality. However, in Bornean orangutans, selective responses to fluctuating environmental conditions appear to have produced physiological adaptations to generally lower and temporally more unpredictable food supplies.
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Affiliation(s)
- Maja P. Mattle-Greminger
- Evolutionary Genetics Group, Department of Anthropology, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
- Department of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
| | - Tugce Bilgin Sonay
- Evolutionary Genetics Group, Department of Anthropology, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
- Swiss Institute of Bioinformatics, Quartier Sorge - Batiment Genopode, 1015 Lausanne, Switzerland
| | - Alexander Nater
- Evolutionary Genetics Group, Department of Anthropology, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
- Department of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
- Lehrstuhl für Zoologie und Evolutionsbiologie, Department of Biology, University of Konstanz, Universitätsstrasse 10, 78457 Konstanz, Germany
| | - Marc Pybus
- Institut de Biologia Evolutiva (UPF-CSIC), Universitat Pompeu Fabra, Doctor Aiguader 88, 08003 Barcelona, Spain
| | - Tariq Desai
- Department of Genetics, University of Cambridge, Downing Street, Cambridge, CB2 3EH UK
| | - Guillem de Valles
- Institut de Biologia Evolutiva (UPF-CSIC), Universitat Pompeu Fabra, Doctor Aiguader 88, 08003 Barcelona, Spain
| | - Ferran Casals
- Servei de Genòmica, Universitat Pompeu Fabra, Doctor Aiguader 88, 08003 Barcelona, Spain
| | - Aylwyn Scally
- Department of Genetics, University of Cambridge, Downing Street, Cambridge, CB2 3EH UK
| | - Jaume Bertranpetit
- Institut de Biologia Evolutiva (UPF-CSIC), Universitat Pompeu Fabra, Doctor Aiguader 88, 08003 Barcelona, Spain
| | - Tomas Marques-Bonet
- Institute of Evolutionary Biology (UPF-CSIC), Universitat Pompeu Fabra, Doctor Aiguader 88, Barcelona, Spain
- Catalan Institution of Research and Advanced Studies (ICREA), Passeig de Lluís Companys 23, Barcelona, Spain
- CNAG-CRG, Centre for Genomic Regulation (CRG), Barcelona Institute of Science and Technology (BIST), Baldiri i Reixac 4, Barcelona, Spain
- Institut Català de Paleontologia Miquel Crusafont, Universitat Autònoma de Barcelona, Edifici ICTA-ICP, c/ Columnes s/n, Cerdanyola del Vallès, Barcelona, Spain
| | - Carel P. van Schaik
- Evolutionary Genetics Group, Department of Anthropology, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
| | - Maria Anisimova
- Swiss Institute of Bioinformatics, Quartier Sorge - Batiment Genopode, 1015 Lausanne, Switzerland
- Institute of Applied Simulations, School of Life Sciences and Facility Management, Zurich University of Applied Sciences ZHAW, Einsiedlerstrasse 31a, 8820 Wädenswil, Switzerland
| | - Michael Krützen
- Evolutionary Genetics Group, Department of Anthropology, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
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Skov L, Hui R, Shchur V, Hobolth A, Scally A, Schierup MH, Durbin R. Detecting archaic introgression using an unadmixed outgroup. PLoS Genet 2018; 14:e1007641. [PMID: 30226838 PMCID: PMC6161914 DOI: 10.1371/journal.pgen.1007641] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Revised: 09/28/2018] [Accepted: 08/17/2018] [Indexed: 12/24/2022] Open
Abstract
Human populations outside of Africa have experienced at least two bouts of introgression from archaic humans, from Neanderthals and Denisovans. In Papuans there is prior evidence of both these introgressions. Here we present a new approach to detect segments of individual genomes of archaic origin without using an archaic reference genome. The approach is based on a hidden Markov model that identifies genomic regions with a high density of single nucleotide variants (SNVs) not seen in unadmixed populations. We show using simulations that this provides a powerful approach to identifying segments of archaic introgression with a low rate of false detection, given data from a suitable outgroup population is available, without the archaic introgression but containing a majority of the variation that arose since initial separation from the archaic lineage. Furthermore our approach is able to infer admixture proportions and the times both of admixture and of initial divergence between the human and archaic populations. We apply the model to detect archaic introgression in 89 Papuans and show how the identified segments can be assigned to likely Neanderthal or Denisovan origin. We report more Denisovan admixture than previous studies and find a shift in size distribution of fragments of Neanderthal and Denisovan origin that is compatible with a difference in admixture time. Furthermore, we identify small amounts of Denisova ancestry in South East Asians and South Asians. The genetic history of present-day individuals includes episodes of mating between divergent groups, which have led to 'introgressed' genetic material persisting in modern genome sequences. Perhaps the most notable examples of such events in humans are the introgressions from Neanderthals into non-Africans 50,000 or so years ago, and from a related archaic group known as Denisovans into the ancestors of indigenous people from Papua-New Guinea and Australia. Methods to identify introgressions and the genomic regions that derive from them generally involve the use of reference genome sequences for the source populations. However, there are advantages in having methods independent of reference sequences, both to reduce bias and to detect possible introgression from groups for which we currently lack a reference genome. In this paper we describe such an approach, in a statistical framework which exploits the fact that introgressed regions will contain a high density of genetic variants that are private to the group receiving the divergent material. We apply this method to 89 Papuan genome sequences, estimating times of introgression and initial divergence between archaic and modern humans, and compare it to other related methods.
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Affiliation(s)
- Laurits Skov
- Bioinformatics Research Centre, Aarhus University, Aarhus C., Denmark
- * E-mail: (LS); (RD)
| | - Ruoyun Hui
- Department of Genetics, University of Cambridge, Cambridge United Kingdom
| | - Vladimir Shchur
- Wellcome Sanger Institute, Hinxton, Cambridge, United Kingdom
| | - Asger Hobolth
- Bioinformatics Research Centre, Aarhus University, Aarhus C., Denmark
| | - Aylwyn Scally
- Department of Genetics, University of Cambridge, Cambridge United Kingdom
| | | | - Richard Durbin
- Department of Genetics, University of Cambridge, Cambridge United Kingdom
- Wellcome Sanger Institute, Hinxton, Cambridge, United Kingdom
- * E-mail: (LS); (RD)
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Scheib CL, Li H, Desai T, Link V, Kendall C, Dewar G, Griffith PW, Mörseburg A, Johnson JR, Potter A, Kerr SL, Endicott P, Lindo J, Haber M, Xue Y, Tyler-Smith C, Sandhu MS, Lorenz JG, Randall TD, Faltyskova Z, Pagani L, Danecek P, O'Connell TC, Martz P, Boraas AS, Byrd BF, Leventhal A, Cambra R, Williamson R, Lesage L, Holguin B, Ygnacio-De Soto E, Rosas J, Metspalu M, Stock JT, Manica A, Scally A, Wegmann D, Malhi RS, Kivisild T. Ancient human parallel lineages within North America contributed to a coastal expansion. Science 2018; 360:1024-1027. [PMID: 29853687 DOI: 10.1126/science.aar6851] [Citation(s) in RCA: 58] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2017] [Accepted: 04/20/2018] [Indexed: 12/12/2022]
Abstract
Little is known regarding the first people to enter the Americas and their genetic legacy. Genomic analysis of the oldest human remains from the Americas showed a direct relationship between a Clovis-related ancestral population and all modern Central and South Americans as well as a deep split separating them from North Americans in Canada. We present 91 ancient human genomes from California and Southwestern Ontario and demonstrate the existence of two distinct ancestries in North America, which possibly split south of the ice sheets. A contribution from both of these ancestral populations is found in all modern Central and South Americans. The proportions of these two ancestries in ancient and modern populations are consistent with a coastal dispersal and multiple admixture events.
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Affiliation(s)
- C L Scheib
- Department of Archaeology, University of Cambridge, Cambridge CB2 3DZ, UK. .,Estonian Biocentre, Institute of Genomics, University of Tartu, Tartu 51010, Estonia
| | - Hongjie Li
- Department of Anthropology and Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
| | - Tariq Desai
- Department of Genetics, University of Cambridge, Cambridge CB2 3EH, UK
| | - Vivian Link
- Department of Biology, Université de Fribourg, Fribourg, Switzerland
| | - Christopher Kendall
- Department of Anthropology, University of Toronto, Toronto, Ontario M5S 2S2, Canada
| | - Genevieve Dewar
- Department of Anthropology, University of Toronto, Toronto, Ontario M5S 2S2, Canada
| | | | | | - John R Johnson
- Santa Barbara Museum of Natural History, Santa Barbara, CA 93105, USA
| | - Amiee Potter
- Department of Anthropology, Portland State University, Portland, OR 97232, USA.,Knight Diagnostics Laboratory, Oregon Health & Science University, Portland, OR 97239, USA
| | - Susan L Kerr
- Department of Anthropology, Modesto Junior College, Modesto, CA 95350, USA
| | - Phillip Endicott
- Department Hommes Natures Societies, Musée de l'Homme, Paris 75016, France
| | - John Lindo
- Department of Anthropology, Emory University, Atlanta, GA 30322, USA
| | - Marc Haber
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton CB10 1SA, UK
| | - Yali Xue
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton CB10 1SA, UK
| | - Chris Tyler-Smith
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton CB10 1SA, UK
| | | | - Joseph G Lorenz
- Department of Anthropology and Museum Studies, Central Washington University, Ellensburg, WA 98926, USA
| | - Tori D Randall
- Department of Anthropology, San Diego City College, San Diego, CA 92101, USA
| | - Zuzana Faltyskova
- Department of Archaeology, University of Cambridge, Cambridge CB2 3DZ, UK
| | - Luca Pagani
- Estonian Biocentre, Institute of Genomics, University of Tartu, Tartu 51010, Estonia.,APE Lab, Department of Biology, University of Padova, Padova, Italy
| | - Petr Danecek
- Wellcome Sanger Institute, Wellcome Genome Campus, Hinxton CB10 1SA, UK
| | - Tamsin C O'Connell
- Department of Archaeology, University of Cambridge, Cambridge CB2 3DZ, UK
| | - Patricia Martz
- Department of Anthropology, California State University, Los Angeles, CA 90032, USA
| | | | - Brian F Byrd
- Far Western Anthropological Research Group Inc., Davis, CA 95618, USA
| | - Alan Leventhal
- Muwekma Ohlone Tribe of the San Francisco Bay Area, P.O. Box 360791, Milpitas, CA 95036, USA.,Department of Anthropology, San Jose State University, San Jose, CA 95192, USA
| | - Rosemary Cambra
- Muwekma Ohlone Tribe of the San Francisco Bay Area, P.O. Box 360791, Milpitas, CA 95036, USA
| | | | | | - Brian Holguin
- Department of Anthropology, University of California, Los Angeles, CA 90095, USA
| | - Ernestine Ygnacio-De Soto
- Barbareño Chumash, California Indian Advisory Committee, Santa Barbara Museum of Natural History, Santa Barbara, CA 93105, USA
| | | | - Mait Metspalu
- Estonian Biocentre, Institute of Genomics, University of Tartu, Tartu 51010, Estonia
| | - Jay T Stock
- Department of Archaeology, University of Cambridge, Cambridge CB2 3DZ, UK.,Department of Anthropology, University of Western Ontario, London, Ontario N6A 3K7, Canada
| | - Andrea Manica
- Department of Zoology, University of Cambridge, Cambridge CB2 3EJ, UK
| | - Aylwyn Scally
- Department of Genetics, University of Cambridge, Cambridge CB2 3EH, UK
| | - Daniel Wegmann
- Department of Biology, Université de Fribourg, Fribourg, Switzerland
| | - Ripan S Malhi
- Department of Anthropology and Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
| | - Toomas Kivisild
- Department of Archaeology, University of Cambridge, Cambridge CB2 3DZ, UK. .,Estonian Biocentre, Institute of Genomics, University of Tartu, Tartu 51010, Estonia
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13
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Scally A. High-quality genomes reveal new differences between the great apes. Nature 2018; 559:336-338. [DOI: 10.1038/d41586-018-05679-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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14
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Nater A, Mattle-Greminger MP, Nurcahyo A, Nowak MG, de Manuel M, Desai T, Groves C, Pybus M, Sonay TB, Roos C, Lameira AR, Wich SA, Askew J, Davila-Ross M, Fredriksson G, de Valles G, Casals F, Prado-Martinez J, Goossens B, Verschoor EJ, Warren KS, Singleton I, Marques DA, Pamungkas J, Perwitasari-Farajallah D, Rianti P, Tuuga A, Gut IG, Gut M, Orozco-terWengel P, van Schaik CP, Bertranpetit J, Anisimova M, Scally A, Marques-Bonet T, Meijaard E, Krützen M. Morphometric, Behavioral, and Genomic Evidence for a New Orangutan Species. Curr Biol 2017; 27:3487-3498.e10. [PMID: 29103940 DOI: 10.1016/j.cub.2017.09.047] [Citation(s) in RCA: 133] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2017] [Revised: 07/17/2017] [Accepted: 09/20/2017] [Indexed: 12/30/2022]
Abstract
Six extant species of non-human great apes are currently recognized: Sumatran and Bornean orangutans, eastern and western gorillas, and chimpanzees and bonobos [1]. However, large gaps remain in our knowledge of fine-scale variation in hominoid morphology, behavior, and genetics, and aspects of great ape taxonomy remain in flux. This is particularly true for orangutans (genus: Pongo), the only Asian great apes and phylogenetically our most distant relatives among extant hominids [1]. Designation of Bornean and Sumatran orangutans, P. pygmaeus (Linnaeus 1760) and P. abelii (Lesson 1827), as distinct species occurred in 2001 [1, 2]. Here, we show that an isolated population from Batang Toru, at the southernmost range limit of extant Sumatran orangutans south of Lake Toba, is distinct from other northern Sumatran and Bornean populations. By comparing cranio-mandibular and dental characters of an orangutan killed in a human-animal conflict to those of 33 adult male orangutans of a similar developmental stage, we found consistent differences between the Batang Toru individual and other extant Ponginae. Our analyses of 37 orangutan genomes provided a second line of evidence. Model-based approaches revealed that the deepest split in the evolutionary history of extant orangutans occurred ∼3.38 mya between the Batang Toru population and those to the north of Lake Toba, whereas both currently recognized species separated much later, about 674 kya. Our combined analyses support a new classification of orangutans into three extant species. The new species, Pongo tapanuliensis, encompasses the Batang Toru population, of which fewer than 800 individuals survive. VIDEO ABSTRACT.
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Affiliation(s)
- Alexander Nater
- Evolutionary Genetics Group, Department of Anthropology, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland; Department of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland; Lehrstuhl für Zoologie und Evolutionsbiologie, Department of Biology, University of Konstanz, Universitätsstrasse 10, 78457 Konstanz, Germany.
| | - Maja P Mattle-Greminger
- Evolutionary Genetics Group, Department of Anthropology, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland; Department of Evolutionary Biology and Environmental Studies, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
| | - Anton Nurcahyo
- School of Archaeology and Anthropology, Australian National University, Canberra, ACT, Australia
| | - Matthew G Nowak
- Sumatran Orangutan Conservation Programme (PanEco-YEL), Jalan Wahid Hasyim 51/74, Medan 20154, Indonesia; Department of Anthropology, Southern Illinois University, 1000 Faner Drive, Carbondale, IL 62901, USA
| | - Marc de Manuel
- Institut de Biologia Evolutiva (UPF-CSIC), Universitat Pompeu Fabra, Doctor Aiguader 88, Barcelona 08003, Spain
| | - Tariq Desai
- Department of Genetics, University of Cambridge, Downing Street, Cambridge CB2 3EH, UK
| | - Colin Groves
- School of Archaeology and Anthropology, Australian National University, Canberra, ACT, Australia
| | - Marc Pybus
- Institut de Biologia Evolutiva (UPF-CSIC), Universitat Pompeu Fabra, Doctor Aiguader 88, Barcelona 08003, Spain
| | - Tugce Bilgin Sonay
- Evolutionary Genetics Group, Department of Anthropology, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
| | - Christian Roos
- Gene Bank of Primates and Primate Genetics Laboratory, German Primate Center, Leibniz Institute for Primate Research, 37077 Göttingen, Germany
| | - Adriano R Lameira
- Department of Anthropology, Durham University, Dawson Building, South Road, Durham DH1 3LE, UK; School of Psychology & Neuroscience, St. Andrews University, St. Mary's Quad, South Street, St. Andrews, Fife KY16 9JP, Scotland, UK
| | - Serge A Wich
- School of Natural Sciences and Psychology, Liverpool John Moores University, James Parsons Building, Byrom Street, Liverpool L3 3AF, UK; Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Science Park 904, Amsterdam 1098, the Netherlands
| | - James Askew
- Department of Biological Sciences, University of Southern California, 3616 Trousdale Parkway, Los Angeles, CA 90089, USA
| | - Marina Davila-Ross
- Department of Psychology, University of Portsmouth, King Henry Building, King Henry 1(st) Street, Portsmouth PO1 2DY, UK
| | - Gabriella Fredriksson
- Sumatran Orangutan Conservation Programme (PanEco-YEL), Jalan Wahid Hasyim 51/74, Medan 20154, Indonesia; Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Science Park 904, Amsterdam 1098, the Netherlands
| | - Guillem de Valles
- Institut de Biologia Evolutiva (UPF-CSIC), Universitat Pompeu Fabra, Doctor Aiguader 88, Barcelona 08003, Spain
| | - Ferran Casals
- Servei de Genòmica, Universitat Pompeu Fabra, Doctor Aiguader 88, Barcelona 08003, Spain
| | | | - Benoit Goossens
- School of Biosciences, Cardiff University, Sir Martin Evans Building, Museum Avenue, Cardiff CF10 3AX, UK; Danau Girang Field Centre, c/o Sabah Wildlife Department, Wisma Muis, 88100 Kota Kinabalu, Sabah, Malaysia; Sabah Wildlife Department, Wisma Muis, 88100 Kota Kinabalu, Sabah, Malaysia; Sustainable Places Research Institute, Cardiff University, 33 Park Place, Cardiff CF10 3BA, UK
| | - Ernst J Verschoor
- Department of Virology, Biomedical Primate Research Centre, Lange Kleiweg 161, 2288GJ Rijswijk, the Netherlands
| | - Kristin S Warren
- Conservation Medicine Program, College of Veterinary Medicine, Murdoch University, South Street, Murdoch, WA 6150, Australia
| | - Ian Singleton
- Sumatran Orangutan Conservation Programme (PanEco-YEL), Jalan Wahid Hasyim 51/74, Medan 20154, Indonesia; Foundation for a Sustainable Ecosystem (YEL), Medan, Indonesia
| | - David A Marques
- Evolutionary Genetics Group, Department of Anthropology, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland; Institute of Ecology and Evolution, University of Bern, Baltzerstrasse 6, 3012 Bern, Switzerland
| | - Joko Pamungkas
- Primate Research Center, Bogor Agricultural University, Bogor 16151, Indonesia; Faculty of Veterinary Medicine, Bogor Agricultural University, Darmaga Campus, Bogor 16680, Indonesia
| | - Dyah Perwitasari-Farajallah
- Primate Research Center, Bogor Agricultural University, Bogor 16151, Indonesia; Animal Biosystematics and Ecology Division, Department of Biology, Bogor Agricultural University, Jalan Agatis, Dramaga Campus, Bogor 16680, Indonesia
| | - Puji Rianti
- Evolutionary Genetics Group, Department of Anthropology, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland; Primate Research Center, Bogor Agricultural University, Bogor 16151, Indonesia; Animal Biosystematics and Ecology Division, Department of Biology, Bogor Agricultural University, Jalan Agatis, Dramaga Campus, Bogor 16680, Indonesia
| | - Augustine Tuuga
- Sabah Wildlife Department, Wisma Muis, 88100 Kota Kinabalu, Sabah, Malaysia
| | - Ivo G Gut
- CNAG-CRG, Centre for Genomic Regulation (CRG), Barcelona Institute of Science and Technology (BIST), Baldiri i Reixac 4, Barcelona 08028, Spain; Universitat Pompeu Fabra (UPF), Plaça de la Mercè 10, 08002 Barcelona, Spain
| | - Marta Gut
- CNAG-CRG, Centre for Genomic Regulation (CRG), Barcelona Institute of Science and Technology (BIST), Baldiri i Reixac 4, Barcelona 08028, Spain; Universitat Pompeu Fabra (UPF), Plaça de la Mercè 10, 08002 Barcelona, Spain
| | - Pablo Orozco-terWengel
- School of Biosciences, Cardiff University, Sir Martin Evans Building, Museum Avenue, Cardiff CF10 3AX, UK
| | - Carel P van Schaik
- Evolutionary Genetics Group, Department of Anthropology, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
| | - Jaume Bertranpetit
- Institut de Biologia Evolutiva (UPF-CSIC), Universitat Pompeu Fabra, Doctor Aiguader 88, Barcelona 08003, Spain; Leverhulme Centre for Human Evolutionary Studies, Department of Archaeology and Anthropology, University of Cambridge, Cambridge, UK
| | - Maria Anisimova
- Institute of Applied Simulations, School of Life Sciences and Facility Management, Zurich University of Applied Sciences (ZHAW), Einsiedlerstrasse 31a, 8820 Wädenswil, Switzerland; Swiss Institute of Bioinformatics, Quartier Sorge-Batiment Genopode, 1015 Lausanne, Switzerland
| | - Aylwyn Scally
- Department of Genetics, University of Cambridge, Downing Street, Cambridge CB2 3EH, UK
| | - Tomas Marques-Bonet
- Institut de Biologia Evolutiva (UPF-CSIC), Universitat Pompeu Fabra, Doctor Aiguader 88, Barcelona 08003, Spain; CNAG-CRG, Centre for Genomic Regulation (CRG), Barcelona Institute of Science and Technology (BIST), Baldiri i Reixac 4, Barcelona 08028, Spain; Institucio Catalana de Recerca i Estudis Avançats (ICREA), Barcelona 08010, Spain
| | - Erik Meijaard
- School of Archaeology and Anthropology, Australian National University, Canberra, ACT, Australia; Borneo Futures, Bandar Seri Begawan, Brunei Darussalam.
| | - Michael Krützen
- Evolutionary Genetics Group, Department of Anthropology, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland.
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Narasimhan VM, Rahbari R, Scally A, Wuster A, Mason D, Xue Y, Wright J, Trembath RC, Maher ER, van Heel DA, Auton A, Hurles ME, Tyler-Smith C, Durbin R. Estimating the human mutation rate from autozygous segments reveals population differences in human mutational processes. Nat Commun 2017; 8:303. [PMID: 28827725 PMCID: PMC5566399 DOI: 10.1038/s41467-017-00323-y] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Accepted: 06/20/2017] [Indexed: 11/08/2022] Open
Abstract
Heterozygous mutations within homozygous sequences descended from a recent common ancestor offer a way to ascertain de novo mutations across multiple generations. Using exome sequences from 3222 British-Pakistani individuals with high parental relatedness, we estimate a mutation rate of 1.45 ± 0.05 × 10-8 per base pair per generation in autosomal coding sequence, with a corresponding non-crossover gene conversion rate of 8.75 ± 0.05 × 10-6 per base pair per generation. This is at the lower end of exome mutation rates previously estimated in parent-offspring trios, suggesting that post-zygotic mutations contribute little to the human germ-line mutation rate. We find frequent recurrence of mutations at polymorphic CpG sites, and an increase in C to T mutations in a 5' CCG 3' to 5' CTG 3' context in the Pakistani population compared to Europeans, suggesting that mutational processes have evolved rapidly between human populations.Estimates of human mutation rates differ substantially based on the approach. Here, the authors present a multi-generational estimate from the autozygous segment in a non-European population that gives insight into the contribution of post-zygotic mutations and population-specific mutational processes.
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Affiliation(s)
| | - Raheleh Rahbari
- Wellcome Trust Sanger Institute, Hinxton, Cambridge, CB10 1SA UK
| | - Aylwyn Scally
- Department of Genetics, University of Cambridge, Cambridge, CB2 3EH UK
| | - Arthur Wuster
- Wellcome Trust Sanger Institute, Hinxton, Cambridge, CB10 1SA UK
- Department of Human Genetics and Department of Bioinformatics and Computational Biology, Genentech Inc., South San Francisco, CA 94080 USA
| | - Dan Mason
- Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, BD9 6RJ UK
| | - Yali Xue
- Wellcome Trust Sanger Institute, Hinxton, Cambridge, CB10 1SA UK
| | - John Wright
- Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Foundation Trust, Bradford, BD9 6RJ UK
| | - Richard C. Trembath
- Division of Genetics and Molecular Medicine, Faculty of Life Sciences and Medicine, King’s College, London, SE1 1UL UK
| | - Eamonn R. Maher
- Department of Medical Genetics, University of Cambridge, Cambridge, CB2 0QQ UK
- Cambridge NIHR Biomedical Research Centre, Cambridge, CB2 0QQ UK
| | - David A. van Heel
- Blizard Institute, Barts and The London School of Medicine and Dentistry, Queen Mary University of London, London, E1 2AT UK
| | - Adam Auton
- Department of Genetics, Albert Einstein College of Medicine, Bronx, NY 10461 USA
| | | | | | - Richard Durbin
- Wellcome Trust Sanger Institute, Hinxton, Cambridge, CB10 1SA UK
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16
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Abstract
An analysis of worldwide human genetic variation reveals the footprints of ancient changes in genomic mutation processes.
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Affiliation(s)
- Aylwyn Scally
- Department of Genetics, University of Cambridge, Cambridge, United Kingdom
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17
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Seoighe C, Scally A. Inference of Candidate Germline Mutator Loci in Humans from Genome-Wide Haplotype Data. PLoS Genet 2017; 13:e1006549. [PMID: 28095480 PMCID: PMC5283766 DOI: 10.1371/journal.pgen.1006549] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Revised: 01/31/2017] [Accepted: 12/20/2016] [Indexed: 12/27/2022] Open
Abstract
The rate of germline mutation varies widely between species but little is known about the extent of variation in the germline mutation rate between individuals of the same species. Here we demonstrate that an allele that increases the rate of germline mutation can result in a distinctive signature in the genomic region linked to the affected locus, characterized by a number of haplotypes with a locally high proportion of derived alleles, against a background of haplotypes carrying a typical proportion of derived alleles. We searched for this signature in human haplotype data from phase 3 of the 1000 Genomes Project and report a number of candidate mutator loci, several of which are located close to or within genes involved in DNA repair or the DNA damage response. To investigate whether mutator alleles remained active at any of these loci, we used de novo mutation counts from human parent-offspring trios in the 1000 Genomes and Genome of the Netherlands cohorts, looking for an elevated number of de novo mutations in the offspring of parents carrying a candidate mutator haplotype at each of these loci. We found some support for two of the candidate loci, including one locus just upstream of the BRSK2 gene, which is expressed in the testis and has been reported to be involved in the response to DNA damage.
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Affiliation(s)
- Cathal Seoighe
- School of Mathematics, Statistics and Applied Mathematics, NUI Galway, Galway, Ireland
- Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town, South Africa
| | - Aylwyn Scally
- Department of Genetics, University of Cambridge, Cambridge, United Kingdom
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de Manuel M, Kuhlwilm M, Frandsen P, Sousa VC, Desai T, Prado-Martinez J, Hernandez-Rodriguez J, Dupanloup I, Lao O, Hallast P, Schmidt JM, Heredia-Genestar JM, Benazzo A, Barbujani G, Peter BM, Kuderna LFK, Casals F, Angedakin S, Arandjelovic M, Boesch C, Kühl H, Vigilant L, Langergraber K, Novembre J, Gut M, Gut I, Navarro A, Carlsen F, Andrés AM, Siegismund HR, Scally A, Excoffier L, Tyler-Smith C, Castellano S, Xue Y, Hvilsom C, Marques-Bonet T. Chimpanzee genomic diversity reveals ancient admixture with bonobos. Science 2016; 354:477-481. [PMID: 27789843 DOI: 10.1126/science.aag2602] [Citation(s) in RCA: 153] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2016] [Accepted: 09/09/2016] [Indexed: 12/13/2022]
Abstract
Our closest living relatives, chimpanzees and bonobos, have a complex demographic history. We analyzed the high-coverage whole genomes of 75 wild-born chimpanzees and bonobos from 10 countries in Africa. We found that chimpanzee population substructure makes genetic information a good predictor of geographic origin at country and regional scales. Multiple lines of evidence suggest that gene flow occurred from bonobos into the ancestors of central and eastern chimpanzees between 200,000 and 550,000 years ago, probably with subsequent spread into Nigeria-Cameroon chimpanzees. Together with another, possibly more recent contact (after 200,000 years ago), bonobos contributed less than 1% to the central chimpanzee genomes. Admixture thus appears to have been widespread during hominid evolution.
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Affiliation(s)
- Marc de Manuel
- Institut de Biologia Evolutiva (Consejo Superior de Investigaciones Científicas-Universitat Pompeu Fabra), Barcelona Biomedical Research Park, Doctor Aiguader 88, Barcelona, Catalonia 08003, Spain
| | - Martin Kuhlwilm
- Institut de Biologia Evolutiva (Consejo Superior de Investigaciones Científicas-Universitat Pompeu Fabra), Barcelona Biomedical Research Park, Doctor Aiguader 88, Barcelona, Catalonia 08003, Spain
| | - Peter Frandsen
- Section for Computational and RNA Biology, Department of Biology, University of Copenhagen, 2200 Copenhagen, Denmark. Center for Zoo and Wild Animal Health, Copenhagen Zoo, 2000 Frederiksberg, Denmark
| | - Vitor C Sousa
- Computational and Molecular Population Genetics, Institute of Ecology and Evolution, University of Berne, 3012 Berne, Switzerland. Swiss Institute of Bioinformatics, 1015 Lausanne, Switzerland
| | - Tariq Desai
- Department of Genetics, University of Cambridge, Cambridge CB2 3EH, UK
| | - Javier Prado-Martinez
- Institut de Biologia Evolutiva (Consejo Superior de Investigaciones Científicas-Universitat Pompeu Fabra), Barcelona Biomedical Research Park, Doctor Aiguader 88, Barcelona, Catalonia 08003, Spain. Wellcome Trust Sanger Institute, Wellcome Genome Campus, Hinxton CB10 1SA, UK
| | - Jessica Hernandez-Rodriguez
- Institut de Biologia Evolutiva (Consejo Superior de Investigaciones Científicas-Universitat Pompeu Fabra), Barcelona Biomedical Research Park, Doctor Aiguader 88, Barcelona, Catalonia 08003, Spain
| | - Isabelle Dupanloup
- Computational and Molecular Population Genetics, Institute of Ecology and Evolution, University of Berne, 3012 Berne, Switzerland. Swiss Institute of Bioinformatics, 1015 Lausanne, Switzerland
| | - Oscar Lao
- National Centre for Genomic Analysis-Centre for Genomic Regulation, Barcelona Institute of Science and Technology, 08028 Barcelona, Spain. Universitat Pompeu Fabra, 08003 Barcelona, Spain
| | - Pille Hallast
- Wellcome Trust Sanger Institute, Wellcome Genome Campus, Hinxton CB10 1SA, UK. Institute of Molecular and Cell Biology, University of Tartu, Tartu 51010, Estonia
| | - Joshua M Schmidt
- Department of Evolutionary Genetics, Max Planck Institute for Evolutionary Anthropology, 04103, Leipzig, Germany
| | - José María Heredia-Genestar
- Institut de Biologia Evolutiva (Consejo Superior de Investigaciones Científicas-Universitat Pompeu Fabra), Barcelona Biomedical Research Park, Doctor Aiguader 88, Barcelona, Catalonia 08003, Spain
| | - Andrea Benazzo
- Department of Life Sciences and Biotechnology, University of Ferrara, 44121 Ferrara, Italy
| | - Guido Barbujani
- Department of Life Sciences and Biotechnology, University of Ferrara, 44121 Ferrara, Italy
| | - Benjamin M Peter
- Department of Human Genetics, University of Chicago, Chicago, IL 60637, USA
| | - Lukas F K Kuderna
- Institut de Biologia Evolutiva (Consejo Superior de Investigaciones Científicas-Universitat Pompeu Fabra), Barcelona Biomedical Research Park, Doctor Aiguader 88, Barcelona, Catalonia 08003, Spain
| | - Ferran Casals
- Institut de Biologia Evolutiva (Consejo Superior de Investigaciones Científicas-Universitat Pompeu Fabra), Barcelona Biomedical Research Park, Doctor Aiguader 88, Barcelona, Catalonia 08003, Spain
| | - Samuel Angedakin
- Department of Primatology, Max Planck Institute for Evolutionary Anthropology, 04103 Leipzig, Germany
| | - Mimi Arandjelovic
- Department of Primatology, Max Planck Institute for Evolutionary Anthropology, 04103 Leipzig, Germany
| | - Christophe Boesch
- Department of Primatology, Max Planck Institute for Evolutionary Anthropology, 04103 Leipzig, Germany
| | - Hjalmar Kühl
- Department of Primatology, Max Planck Institute for Evolutionary Anthropology, 04103 Leipzig, Germany
| | - Linda Vigilant
- Department of Primatology, Max Planck Institute for Evolutionary Anthropology, 04103 Leipzig, Germany
| | - Kevin Langergraber
- School of Human Evolution and Social Change and Institute of Human Origins, Arizona State University, Tempe, AZ 85287, USA
| | - John Novembre
- Department of Human Genetics, University of Chicago, Chicago, IL 60637, USA
| | - Marta Gut
- National Centre for Genomic Analysis-Centre for Genomic Regulation, Barcelona Institute of Science and Technology, 08028 Barcelona, Spain
| | - Ivo Gut
- National Centre for Genomic Analysis-Centre for Genomic Regulation, Barcelona Institute of Science and Technology, 08028 Barcelona, Spain
| | - Arcadi Navarro
- Institut de Biologia Evolutiva (Consejo Superior de Investigaciones Científicas-Universitat Pompeu Fabra), Barcelona Biomedical Research Park, Doctor Aiguader 88, Barcelona, Catalonia 08003, Spain. National Centre for Genomic Analysis-Centre for Genomic Regulation, Barcelona Institute of Science and Technology, 08028 Barcelona, Spain. Institucio Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Catalonia 08010, Spain
| | - Frands Carlsen
- Center for Zoo and Wild Animal Health, Copenhagen Zoo, 2000 Frederiksberg, Denmark
| | - Aida M Andrés
- Department of Evolutionary Genetics, Max Planck Institute for Evolutionary Anthropology, 04103, Leipzig, Germany
| | - Hans R Siegismund
- Section for Computational and RNA Biology, Department of Biology, University of Copenhagen, 2200 Copenhagen, Denmark
| | - Aylwyn Scally
- Department of Genetics, University of Cambridge, Cambridge CB2 3EH, UK
| | - Laurent Excoffier
- Computational and Molecular Population Genetics, Institute of Ecology and Evolution, University of Berne, 3012 Berne, Switzerland. Swiss Institute of Bioinformatics, 1015 Lausanne, Switzerland
| | - Chris Tyler-Smith
- Wellcome Trust Sanger Institute, Wellcome Genome Campus, Hinxton CB10 1SA, UK
| | - Sergi Castellano
- Department of Evolutionary Genetics, Max Planck Institute for Evolutionary Anthropology, 04103, Leipzig, Germany
| | - Yali Xue
- Wellcome Trust Sanger Institute, Wellcome Genome Campus, Hinxton CB10 1SA, UK
| | - Christina Hvilsom
- Center for Zoo and Wild Animal Health, Copenhagen Zoo, 2000 Frederiksberg, Denmark.
| | - Tomas Marques-Bonet
- Institut de Biologia Evolutiva (Consejo Superior de Investigaciones Científicas-Universitat Pompeu Fabra), Barcelona Biomedical Research Park, Doctor Aiguader 88, Barcelona, Catalonia 08003, Spain. National Centre for Genomic Analysis-Centre for Genomic Regulation, Barcelona Institute of Science and Technology, 08028 Barcelona, Spain. Institucio Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Catalonia 08010, Spain.
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Scally A. The mutation rate in human evolution and demographic inference. Curr Opin Genet Dev 2016; 41:36-43. [PMID: 27589081 DOI: 10.1016/j.gde.2016.07.008] [Citation(s) in RCA: 87] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Revised: 07/07/2016] [Accepted: 07/11/2016] [Indexed: 01/23/2023]
Abstract
The germline mutation rate has long been a major source of uncertainty in human evolutionary and demographic analyses based on genetic data, but estimates have improved substantially in recent years. I discuss our current knowledge of the mutation rate in humans and the underlying biological factors affecting it, which include generation time, parental age and other developmental and reproductive timescales. There is good evidence for a slowdown in mean mutation rate during great ape evolution, but not for a more recent change within the timescale of human genetic diversity. Hence, pending evidence to the contrary, it is reasonable to use a present-day rate of approximately 0.5×10-9bp-1year-1 in all human or hominin demographic analyses.
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Affiliation(s)
- Aylwyn Scally
- Department of Genetics, University of Cambridge, Downing Street, Cambridge CB2 3EH, United Kingdom.
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20
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Abstract
Genome sequencing studies of de novo mutations in humans have revealed surprising incongruities in our understanding of human germline mutation. In particular, the mutation rate observed in modern humans is substantially lower than that estimated from calibration against the fossil record, and the paternal age effect in mutations transmitted to offspring is much weaker than expected from our long-standing model of spermatogenesis. I consider possible explanations for these discrepancies, including evolutionary changes in life-history parameters such as generation time and the age of puberty, a possible contribution from undetected post-zygotic mutations early in embryo development, and changes in cellular mutation processes at different stages of the germline. I suggest a revised model of stem-cell state transitions during spermatogenesis, in which 'dark' gonial stem cells play a more active role than hitherto envisaged, with a long cycle time undetected in experimental observations. More generally, I argue that the mutation rate and its evolution depend intimately on the structure of the germline in humans and other primates.This article is part of the themed issue 'Dating species divergences using rocks and clocks'.
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Affiliation(s)
- Aylwyn Scally
- Department of Genetics, University of Cambridge, Cambridge CB2 3EH, UK
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21
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Groucutt HS, Petraglia MD, Bailey G, Scerri EML, Parton A, Clark-Balzan L, Jennings RP, Lewis L, Blinkhorn J, Drake NA, Breeze PS, Inglis RH, Devès MH, Meredith-Williams M, Boivin N, Thomas MG, Scally A. Rethinking the dispersal of Homo sapiens out of Africa. Evol Anthropol 2016; 24:149-64. [PMID: 26267436 DOI: 10.1002/evan.21455] [Citation(s) in RCA: 224] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Current fossil, genetic, and archeological data indicate that Homo sapiens originated in Africa in the late Middle Pleistocene. By the end of the Late Pleistocene, our species was distributed across every continent except Antarctica, setting the foundations for the subsequent demographic and cultural changes of the Holocene. The intervening processes remain intensely debated and a key theme in hominin evolutionary studies. We review archeological, fossil, environmental, and genetic data to evaluate the current state of knowledge on the dispersal of Homo sapiens out of Africa. The emerging picture of the dispersal process suggests dynamic behavioral variability, complex interactions between populations, and an intricate genetic and cultural legacy. This evolutionary and historical complexity challenges simple narratives and suggests that hybrid models and the testing of explicit hypotheses are required to understand the expansion of Homo sapiens into Eurasia.
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22
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Narasimhan V, Danecek P, Scally A, Xue Y, Tyler-Smith C, Durbin R. BCFtools/RoH: a hidden Markov model approach for detecting autozygosity from next-generation sequencing data. Bioinformatics 2016; 32:1749-51. [PMID: 26826718 PMCID: PMC4892413 DOI: 10.1093/bioinformatics/btw044] [Citation(s) in RCA: 323] [Impact Index Per Article: 40.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2015] [Accepted: 01/20/2016] [Indexed: 11/22/2022] Open
Abstract
Summary: Runs of homozygosity (RoHs) are genomic stretches of a diploid genome that show identical alleles on both chromosomes. Longer RoHs are unlikely to have arisen by chance but are likely to denote autozygosity, whereby both copies of the genome descend from the same recent ancestor. Early tools to detect RoH used genotype array data, but substantially more information is available from sequencing data. Here, we present and evaluate BCFtools/RoH, an extension to the BCFtools software package, that detects regions of autozygosity in sequencing data, in particular exome data, using a hidden Markov model. By applying it to simulated data and real data from the 1000 Genomes Project we estimate its accuracy and show that it has higher sensitivity and specificity than existing methods under a range of sequencing error rates and levels of autozygosity. Availability and implementation: BCFtools/RoH and its associated binary/source files are freely available from https://github.com/samtools/BCFtools. Contact:vn2@sanger.ac.uk or pd3@sanger.ac.uk Supplementary information:Supplementary data are available at Bioinformatics online.
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Affiliation(s)
| | | | - Aylwyn Scally
- Department of Genetics, University of Cambridge, Cambridge, UK
| | - Yali Xue
- Wellcome Trust Sanger Institute, Hinxton and
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23
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Kennedy MPT, Quinn JA, Biswas AR, Rothwell A, Scally A, Cheyne L, Callister MEJ. S104 Factors affecting sensitising EGFR mutation rate and cell type in stage IIIB/IV lung cancer: Abstract S104 Table 1. Thorax 2015. [DOI: 10.1136/thoraxjnl-2015-207770.110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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24
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Pagani L, Schiffels S, Gurdasani D, Danecek P, Scally A, Chen Y, Xue Y, Haber M, Ekong R, Oljira T, Mekonnen E, Luiselli D, Bradman N, Bekele E, Zalloua P, Durbin R, Kivisild T, Tyler-Smith C. Tracing the route of modern humans out of Africa by using 225 human genome sequences from Ethiopians and Egyptians. Am J Hum Genet 2015; 96:986-91. [PMID: 26027499 PMCID: PMC4457944 DOI: 10.1016/j.ajhg.2015.04.019] [Citation(s) in RCA: 96] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2015] [Accepted: 04/29/2015] [Indexed: 12/25/2022] Open
Abstract
The predominantly African origin of all modern human populations is well established, but the route taken out of Africa is still unclear. Two alternative routes, via Egypt and Sinai or across the Bab el Mandeb strait into Arabia, have traditionally been proposed as feasible gateways in light of geographic, paleoclimatic, archaeological, and genetic evidence. Distinguishing among these alternatives has been difficult. We generated 225 whole-genome sequences (225 at 8× depth, of which 8 were increased to 30×; Illumina HiSeq 2000) from six modern Northeast African populations (100 Egyptians and five Ethiopian populations each represented by 25 individuals). West Eurasian components were masked out, and the remaining African haplotypes were compared with a panel of sub-Saharan African and non-African genomes. We showed that masked Northeast African haplotypes overall were more similar to non-African haplotypes and more frequently present outside Africa than were any sets of haplotypes derived from a West African population. Furthermore, the masked Egyptian haplotypes showed these properties more markedly than the masked Ethiopian haplotypes, pointing to Egypt as the more likely gateway in the exodus to the rest of the world. Using five Ethiopian and three Egyptian high-coverage masked genomes and the multiple sequentially Markovian coalescent (MSMC) approach, we estimated the genetic split times of Egyptians and Ethiopians from non-African populations at 55,000 and 65,000 years ago, respectively, whereas that of West Africans was estimated to be 75,000 years ago. Both the haplotype and MSMC analyses thus suggest a predominant northern route out of Africa via Egypt.
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Affiliation(s)
- Luca Pagani
- The Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton CB10 1SA, UK; Department of Archaeology and Anthropology, University of Cambridge, Cambridge CB2 1QH, UK; Department of Biological, Geological, and Environmental Sciences, University of Bologna, 40126 Bologna, Italy.
| | - Stephan Schiffels
- The Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton CB10 1SA, UK
| | - Deepti Gurdasani
- The Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton CB10 1SA, UK
| | - Petr Danecek
- The Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton CB10 1SA, UK
| | - Aylwyn Scally
- Department of Genetics, University of Cambridge, Cambridge CB2 3EH, UK
| | - Yuan Chen
- The Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton CB10 1SA, UK
| | - Yali Xue
- The Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton CB10 1SA, UK
| | - Marc Haber
- The Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton CB10 1SA, UK; The Lebanese American University, Chouran, Beirut 1102 2801, Lebanon
| | - Rosemary Ekong
- Department of Genetics, Evolution, and Environment, University College London, London WC1E 6BT, UK
| | - Tamiru Oljira
- University of Addis Ababa and Center of Human Genetic Diversity, PO Box 1176, Ethiopia
| | - Ephrem Mekonnen
- University of Addis Ababa and Center of Human Genetic Diversity, PO Box 1176, Ethiopia
| | - Donata Luiselli
- Department of Biological, Geological, and Environmental Sciences, University of Bologna, 40126 Bologna, Italy
| | - Neil Bradman
- Henry Stewart Group, 28/30 Little Russell Street, London WC1A 2HN, UK
| | - Endashaw Bekele
- University of Addis Ababa and Center of Human Genetic Diversity, PO Box 1176, Ethiopia
| | - Pierre Zalloua
- The Lebanese American University, Chouran, Beirut 1102 2801, Lebanon; Harvard T.H. Chan School of Public Health, Boston, MA 02115, USA
| | - Richard Durbin
- The Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton CB10 1SA, UK
| | - Toomas Kivisild
- Department of Archaeology and Anthropology, University of Cambridge, Cambridge CB2 1QH, UK
| | - Chris Tyler-Smith
- The Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton CB10 1SA, UK
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25
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Xue Y, Prado-Martinez J, Sudmant PH, Narasimhan V, Ayub Q, Szpak M, Frandsen P, Chen Y, Yngvadottir B, Cooper DN, de Manuel M, Hernandez-Rodriguez J, Lobon I, Siegismund HR, Pagani L, Quail MA, Hvilsom C, Mudakikwa A, Eichler EE, Cranfield MR, Marques-Bonet T, Tyler-Smith C, Scally A. Mountain gorilla genomes reveal the impact of long-term population decline and inbreeding. Science 2015; 348:242-245. [PMID: 25859046 PMCID: PMC4668944 DOI: 10.1126/science.aaa3952] [Citation(s) in RCA: 221] [Impact Index Per Article: 24.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2014] [Accepted: 03/03/2015] [Indexed: 12/30/2022]
Abstract
Mountain gorillas are an endangered great ape subspecies and a prominent focus for conservation, yet we know little about their genomic diversity and evolutionary past. We sequenced whole genomes from multiple wild individuals and compared the genomes of all four Gorilla subspecies. We found that the two eastern subspecies have experienced a prolonged population decline over the past 100,000 years, resulting in very low genetic diversity and an increased overall burden of deleterious variation. A further recent decline in the mountain gorilla population has led to extensive inbreeding, such that individuals are typically homozygous at 34% of their sequence, leading to the purging of severely deleterious recessive mutations from the population. We discuss the causes of their decline and the consequences for their future survival.
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Affiliation(s)
- Yali Xue
- Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton CB10 1SA, UK
| | - Javier Prado-Martinez
- Institut de Biologia Evolutiva (CSIC/UPF), Parque de Investigación Biomédica de Barcelona (PRBB), Barcelona, Catalonia 08003, Spain
| | - Peter H. Sudmant
- Department of Genome Sciences, University of Washington, Seattle, WA 98195, USA
| | - Vagheesh Narasimhan
- Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton CB10 1SA, UK
- Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge CB3 0WA, UK
| | - Qasim Ayub
- Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton CB10 1SA, UK
| | - Michal Szpak
- Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton CB10 1SA, UK
| | - Peter Frandsen
- Department of Biology, University of Copenhagen, DK-2200 Copenhagen N, Denmark
| | - Yuan Chen
- Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton CB10 1SA, UK
| | - Bryndis Yngvadottir
- Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton CB10 1SA, UK
| | - David N. Cooper
- Institute of Medical Genetics, Cardiff University, Cardiff CF14 4XN, UK
| | - Marc de Manuel
- Institut de Biologia Evolutiva (CSIC/UPF), Parque de Investigación Biomédica de Barcelona (PRBB), Barcelona, Catalonia 08003, Spain
| | - Jessica Hernandez-Rodriguez
- Institut de Biologia Evolutiva (CSIC/UPF), Parque de Investigación Biomédica de Barcelona (PRBB), Barcelona, Catalonia 08003, Spain
| | - Irene Lobon
- Institut de Biologia Evolutiva (CSIC/UPF), Parque de Investigación Biomédica de Barcelona (PRBB), Barcelona, Catalonia 08003, Spain
| | - Hans R. Siegismund
- Department of Biology, University of Copenhagen, DK-2200 Copenhagen N, Denmark
| | - Luca Pagani
- Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton CB10 1SA, UK
- Department of Biological, Geological and Environmental Sciences, University of Bologna, 40134 Bologna, Italy
| | - Michael A. Quail
- Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton CB10 1SA, UK
| | - Christina Hvilsom
- Research and Conservation, Copenhagen Zoo, DK-2000 Frederiksberg, Denmark
| | | | - Evan E. Eichler
- Department of Genome Sciences, University of Washington, Seattle, WA 98195, USA
- Howard Hughes Medical Institute, Seattle, WA 91895, USA
| | - Michael R. Cranfield
- Gorilla Doctors, Karen C. Drayer Wildlife Health Center, University of California, Davis, CA 95616, USA
| | - Tomas Marques-Bonet
- Institut de Biologia Evolutiva (CSIC/UPF), Parque de Investigación Biomédica de Barcelona (PRBB), Barcelona, Catalonia 08003, Spain
- Centro Nacional de Análisis Genómico (Parc Cientific de Barcelona), Baldiri Reixac 4, 08028 Barcelona, Spain
| | - Chris Tyler-Smith
- Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton CB10 1SA, UK
| | - Aylwyn Scally
- Department of Genetics, University of Cambridge, Cambridge CB2 3EH, UK
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26
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Khan M, Thappar S, Taylor S, Scally A, Sainsbury P. The impact of a short psychological intervention on quality of life and angina control in patients with chronic refractory angina. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht308.p2265] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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27
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Hardy M, Snaith B, Scally A. The impact of immediate reporting on interpretive discrepancies and patient referral pathways within the emergency department: a randomised controlled trial. Br J Radiol 2013; 86:20120112. [PMID: 23255536 PMCID: PMC3615405 DOI: 10.1259/bjr.20120112] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2012] [Revised: 08/07/2012] [Accepted: 09/10/2012] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVE To determine whether an immediate reporting service for musculoskeletal trauma reduces interpretation errors and positively impacts on patient referral pathways. METHODS A pragmatic multicentre randomised controlled trial was undertaken. 1502 patients were recruited and randomly assigned to an immediate or delayed reporting arm and treated according to group assignment. Assessment was made of concordance in image interpretation between emergency department (ED) clinicians and radiology; discharge and referral pathways; and patient journey times. RESULTS 1688 radiographic examinations were performed (1502 patients). 91 discordant interpretations were identified (n=91/1688; 5.4%) with a greater number of discordant interpretations noted in the delayed reporting arm (n=67/849, 7.9%). In the immediate reporting arm, the availability of a report reduced, but did not eliminate, discordance in interpretation (n=24/839, 2.9%). No significant difference in number of patients discharged, referred to hospital clinics or admitted was identified. However, patient ED recalls were significantly reduced (z=2.66; p=0.008) in the immediate reporting arm, as were the number of short-term inpatient bed days (5 days or less) (z=3.636; p<0.001). Patient journey time from ED arrival to discharge or admission was equivalent (z=0.79, p=0.432). CONCLUSION Immediate reporting significantly reduced ED interpretive errors and prevented errors that would require patient recall. However, immediate reporting did not eliminate ED interpretative errors or change the number of patients discharged, referred to hospital clinics or admitted overall. ADVANCES IN KNOWLEDGE This is the first study to consider the wider impact of immediate reporting on the ED patient pathway as a whole and hospital resource usage.
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Affiliation(s)
- M Hardy
- School of Health Studies-Horton A, University of Bradford, Bradford, UK.
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28
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Mailund T, Halager AE, Westergaard M, Dutheil JY, Munch K, Andersen LN, Lunter G, Prüfer K, Scally A, Hobolth A, Schierup MH. A new isolation with migration model along complete genomes infers very different divergence processes among closely related great ape species. PLoS Genet 2012; 8:e1003125. [PMID: 23284294 PMCID: PMC3527290 DOI: 10.1371/journal.pgen.1003125] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2012] [Accepted: 10/14/2012] [Indexed: 11/18/2022] Open
Abstract
We present a hidden Markov model (HMM) for inferring gradual isolation between two populations during speciation, modelled as a time interval with restricted gene flow. The HMM describes the history of adjacent nucleotides in two genomic sequences, such that the nucleotides can be separated by recombination, can migrate between populations, or can coalesce at variable time points, all dependent on the parameters of the model, which are the effective population sizes, splitting times, recombination rate, and migration rate. We show by extensive simulations that the HMM can accurately infer all parameters except the recombination rate, which is biased downwards. Inference is robust to variation in the mutation rate and the recombination rate over the sequence and also robust to unknown phase of genomes unless they are very closely related. We provide a test for whether divergence is gradual or instantaneous, and we apply the model to three key divergence processes in great apes: (a) the bonobo and common chimpanzee, (b) the eastern and western gorilla, and (c) the Sumatran and Bornean orang-utan. We find that the bonobo and chimpanzee appear to have undergone a clear split, whereas the divergence processes of the gorilla and orang-utan species occurred over several hundred thousands years with gene flow stopping quite recently. We also apply the model to the Homo/Pan speciation event and find that the most likely scenario involves an extended period of gene flow during speciation.
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Affiliation(s)
- Thomas Mailund
- Bioinformatics Research Center, Aarhus University, Aarhus, Denmark.
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29
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Abstract
It is now possible to make direct measurements of the mutation rate in modern humans using next-generation sequencing. These measurements reveal a value that is approximately half of that previously derived from fossil calibration, and this has implications for our understanding of demographic events in human evolution and other aspects of population genetics. Here, we discuss the implications of a lower-than-expected mutation rate in relation to the timescale of human evolution.
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30
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Scally A, Dutheil JY, Hillier LW, Jordan GE, Goodhead I, Herrero J, Hobolth A, Lappalainen T, Mailund T, Marques-Bonet T, McCarthy S, Montgomery SH, Schwalie PC, Tang YA, Ward MC, Xue Y, Yngvadottir B, Alkan C, Andersen LN, Ayub Q, Ball EV, Beal K, Bradley BJ, Chen Y, Clee CM, Fitzgerald S, Graves TA, Gu Y, Heath P, Heger A, Karakoc E, Kolb-Kokocinski A, Laird GK, Lunter G, Meader S, Mort M, Mullikin JC, Munch K, O'Connor TD, Phillips AD, Prado-Martinez J, Rogers AS, Sajjadian S, Schmidt D, Shaw K, Simpson JT, Stenson PD, Turner DJ, Vigilant L, Vilella AJ, Whitener W, Zhu B, Cooper DN, de Jong P, Dermitzakis ET, Eichler EE, Flicek P, Goldman N, Mundy NI, Ning Z, Odom DT, Ponting CP, Quail MA, Ryder OA, Searle SM, Warren WC, Wilson RK, Schierup MH, Rogers J, Tyler-Smith C, Durbin R. Insights into hominid evolution from the gorilla genome sequence. Nature 2012; 483:169-75. [PMID: 22398555 PMCID: PMC3303130 DOI: 10.1038/nature10842] [Citation(s) in RCA: 457] [Impact Index Per Article: 38.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2011] [Accepted: 01/10/2012] [Indexed: 12/13/2022]
Abstract
Gorillas are humans’ closest living relatives after chimpanzees, and are of comparable importance for the study of human origins and evolution. Here we present the assembly and analysis of a genome sequence for the western lowland gorilla, and compare the whole genomes of all extant great ape genera. We propose a synthesis of genetic and fossil evidence consistent with placing the human-chimpanzee and human-chimpanzee-gorilla speciation events at approximately 6 and 10 million years ago (Mya). In 30% of the genome, gorilla is closer to human or chimpanzee than the latter are to each other; this is rarer around coding genes, indicating pervasive selection throughout great ape evolution, and has functional consequences in gene expression. A comparison of protein coding genes reveals approximately 500 genes showing accelerated evolution on each of the gorilla, human and chimpanzee lineages, and evidence for parallel acceleration, particularly of genes involved in hearing. We also compare the western and eastern gorilla species, estimating an average sequence divergence time 1.75 million years ago, but with evidence for more recent genetic exchange and a population bottleneck in the eastern species. The use of the genome sequence in these and future analyses will promote a deeper understanding of great ape biology and evolution.
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Affiliation(s)
- Aylwyn Scally
- Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton CB10 1SA, UK
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31
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Fogerty S, King D, Groves C, Scally A, Chandramohan M. Interobserver variation in reporting CT arthrograms of the shoulder. Eur J Radiol 2011; 80:811-3. [DOI: 10.1016/j.ejrad.2010.10.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2010] [Accepted: 10/11/2010] [Indexed: 11/26/2022]
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32
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Kotzé A, Scally A, Howell S. Efficacy and safety of different techniques of paravertebral block for analgesia after thoracotomy: a systematic review and metaregression. Br J Anaesth 2009; 103:626-36. [DOI: 10.1093/bja/aep272] [Citation(s) in RCA: 95] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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33
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Quail MA, Kozarewa I, Smith F, Scally A, Stephens PJ, Durbin R, Swerdlow H, Turner DJ. A large genome center's improvements to the Illumina sequencing system. Nat Methods 2009; 5:1005-10. [PMID: 19034268 DOI: 10.1038/nmeth.1270] [Citation(s) in RCA: 542] [Impact Index Per Article: 36.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The Wellcome Trust Sanger Institute is one of the world's largest genome centers, and a substantial amount of our sequencing is performed with 'next-generation' massively parallel sequencing technologies: in June 2008 the quantity of purity-filtered sequence data generated by our Genome Analyzer (Illumina) platforms reached 1 terabase, and our average weekly Illumina production output is currently 64 gigabases. Here we describe a set of improvements we have made to the standard Illumina protocols to make the library preparation more reliable in a high-throughput environment, to reduce bias, tighten insert size distribution and reliably obtain high yields of data.
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Affiliation(s)
- Michael A Quail
- Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, Cambridgeshire, CB10 1SA, UK
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Lowe AS, Beckett CG, Jowett S, May J, Stephenson S, Scally A, Tam E, Kay CL. Self-expandable metal stent placement for the palliation of malignant gastroduodenal obstruction: experience in a large, single, UK centre. Clin Radiol 2007; 62:738-44. [PMID: 17604761 DOI: 10.1016/j.crad.2007.01.021] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2006] [Revised: 01/11/2007] [Accepted: 01/31/2007] [Indexed: 12/13/2022]
Abstract
AIM To assess the technical success rate, and evaluate the clinical outcome, length of hospital stay, and cost of palliative gastro-duodenal stenting in a single-centre. MATERIALS AND METHODS Eight-seven patients referred for insertion of a gastroduodenal stent between April 1999 and April 2004 were recruited to a non-randomized, before and after intervention study performed in a single centre. Demographic data, diagnosis and symptoms along with clinical and technical outcomes were recorded. RESULTS The technical success rate was 84/87 (96.6%), with inability to traverse the stricture in three patients. No immediate complications were demonstrated. There was marked improvement after stent placement with resolution of symptoms and commencement of dietary intake in 76 patients (87%). Stenting resulted in improved quality of life as reflected by an increase in Karnofsky score from 44/100, to 63/100 post-procedure. Late complications included perforation (n=1), migration (n=1) and stent occlusions due to tumour ingrowth/overgrowth (n=7; mean 165 days). Mean survival was 107 days (range 0-411 days). Median hospital stay post-stent placement was 5.5 days, (range 1-55 days) with a majority of patients (75%) discharged home. The mean cost of each treatment episode was 4146 pounds ($7132 $US, 6,028 EUROS). CONCLUSION The present series confirms that combined endoscopic and radiological gastroduodenal stenting is a highly favourable treatment for patients with inoperable malignant gastric outlet obstruction. The results suggest that this minimally invasive procedure has a very high technical success rate, whilst at the same time providing excellent palliation of symptoms with improved quality of life in the majority of patients.
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Affiliation(s)
- A S Lowe
- Department of Clinical Radiology, Bradford Royal Infirmary, Bradford, UK.
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Abstract
AIM To determine the impact on clinical outcomes of specialist diabetes clinics compared with routine primary care clinics. METHODS Observational study measuring clinical performance (process/outcome measures) in the primary care sector. A cohort of patients attending specialist diabetes clinics was compared with a control cohort of patients attending routine primary care clinics. RESULTS Patients seen in specialist diabetes clinics had a significantly higher HbA1c than patients in routine primary care clinics (mean difference 0.58%; P < 0.001) but there was no significant difference in rate of improvement with visits compared with primary care clinics. In contrast, patients seen in the routine primary care clinics had significantly higher cholesterol levels (mean difference 0.24 mmol/l; P < 0.001) compared with patients in specialist diabetes clinics and their improvement was significantly greater over time (mean difference 0.14 mmol/l per visit compared with 0.10 mmol/l; P < 0.006). Patients in routine primary care clinics also had significantly higher diastolic blood pressure (mean difference 1.6 mmHg; P < 0.007) but there was no difference in improvement with time compared with specialist diabetes clinics. Uptake of podiatry and retinal screening was significantly lower in patients attending routine primary care clinics, but this difference disappeared with time, with significant increases in uptake in the primary care clinic group. Weight increased in both groups significantly with time, but more so in the specialist clinic patients (mean increase 0.18 kg per visit more compared with routine clinic primary care patients; P < 0.001). CONCLUSIONS This study provides evidence that the provision of primary care services for patients with diabetes, whether traditional general practitioner clinics or diabetes clinics run by general practitioners with special interests, is effective in reducing HbA1c, cholesterol and blood pressure. However, the same provision of care was unable to prevent increasing weight or creatinine over time. No evidence was found that patients in specialist clinics do better than patients in routine primary care clinics.
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Affiliation(s)
- H Ismail
- Health Services Research Unit, Bradford Teaching Hospitals NHS Trust, UK
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Brealey S, Scally A, Hahn S, Thomas N, Godfrey C, Crane S. Accuracy of radiographers red dot or triage of accident and emergency radiographs in clinical practice: a systematic review. Clin Radiol 2006; 61:604-15. [PMID: 16784947 DOI: 10.1016/j.crad.2006.01.015] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2005] [Revised: 01/03/2006] [Accepted: 01/16/2006] [Indexed: 11/26/2022]
Abstract
AIM To determine the accuracy of radiographers red dot or triage of accident and emergency (A&E) radiographs in clinical practice. MATERIALS AND METHODS Eligible studies assessed radiographers red dot or triage of A&E radiographs in clinical practice compared with a reference standard and provided accuracy data to construct 2 x 2 tables. Data were extracted on study eligibility and characteristics, quality, and accuracy. Pooled sensitivities and specificities and chi-square tests of heterogeneity were calculated. RESULT Three red dot and five triage studies were eligible for inclusion. Radiographers' red dot of A&E radiographs in clinical practice compared with a reference standard is 0.87 [95% confidence interval (CI) 0.85-0.89] and 0.92 (0.91-0.93) sensitivity and specificity, respectively. Radiographers' triage of A&E radiographs of the skeleton is 0.90 (0.89-0.92) and 0.94 (0.93-0.94) sensitivity and specificity, respectively; and for chest and abdomen is 0.78 (0.74-0.82) and 0.91 (0.88-0.93). Radiographers' red dot of skeletal A&E radiographs without training is 0.71 (0.62-0.79) and 0.96 (0.93-0.97) sensitivity and specificity, respectively; and with training is 0.81 (0.72-0.87) and 0.95 (0.93-0.97). Pooled sensitivity and specificity for radiographers without training for the triage of skeletal A&E radiographs is 0.89 (0.88-0.91) and 0.93 (0.92-0.94); and with training is 0.91 (0.88-0.94) and 0.95 (0.93-0.96). CONCLUSION Radiographers red dot or triage of A&E radiographs in clinical practice is affected by body area, but not by training.
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Affiliation(s)
- S Brealey
- York Trials Unit, Department of Health Sciences, University of York, York.
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Brealey S, Scally A, Hahn S, Thomas N, Godfrey C, Coomarasamy A. Accuracy of radiographer plain radiograph reporting in clinical practice: a meta-analysis. Clin Radiol 2005; 60:232-41. [PMID: 15664578 DOI: 10.1016/j.crad.2004.07.012] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2004] [Revised: 07/19/2004] [Accepted: 07/26/2004] [Indexed: 11/17/2022]
Abstract
AIM To determine the accuracy of radiographer plain radiograph reporting in clinical practice. MATERIALS AND METHODS Studies were identified from electronic sources and by hand searching journals, personal communication and checking reference lists. Eligible studies assessed radiographers' plain radiograph reporting in clinical practice compared with a reference standard, and provided accuracy data to construct 2 x 2 contingency tables. Data were extracted on study eligibility and characteristics, quality and accuracy. Summary estimates of sensitivity and specificity and receiver operating characteristic curves were used to pool the accuracy data. RESULTS Radiographers compared with a reference standard, report plain radiographs in clinical practice at 92.6% (95% CI: 92.0-93.2) and 97.7% (95% CI: 97.5-97.9) sensitivity and specificity, respectively. Studies that compared selectively trained radiographers and radiologists of varying seniority against a reference standard showed no evidence of a difference between radiographer and radiologist reporting accuracy of accident and emergency plain radiographs. Selectively trained radiographers were also found to report such radiographs as accurately as those not solely from accident and emergency, although some variation in reporting accuracy was found for different body areas. Training radiographers improved their accuracy when reporting normal radiographs. CONCLUSION This study systematically synthesizes the literature to provide an evidence-base showing that radiographers can accurately report plain radiographs in clinical practice.
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Affiliation(s)
- S Brealey
- York Trials Unit, Department of Health Sciences, University of York, UK.
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Azar D, Scally A, Hannush S, Soukiasian S, Terry M. Epithelial-defect-masquerade syndrome after laser in situ keratomileusis: characteristic clinical findings and visual outcomes. Am J Ophthalmol 2004. [DOI: 10.1016/j.ajo.2004.04.044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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