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D'Incal C, Van Dijck A, Ibrahim J, De Man K, Bastini L, Konings A, Elinck E, Gozes L, Marusic Z, Anicic M, Vukovic J, Van der Aa N, Mateiu L, Vanden Berghe W, Kooy RF. ADNP dysregulates methylation and mitochondrial gene expression in the cerebellum of a Helsmoortel-Van der Aa syndrome autopsy case. Acta Neuropathol Commun 2024; 12:62. [PMID: 38637827 PMCID: PMC11027339 DOI: 10.1186/s40478-024-01743-w] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Accepted: 02/11/2024] [Indexed: 04/20/2024] Open
Abstract
BACKGROUND Helsmoortel-Van der Aa syndrome is a neurodevelopmental disorder in which patients present with autism, intellectual disability, and frequent extra-neurological features such as feeding and gastrointestinal problems, visual impairments, and cardiac abnormalities. All patients exhibit heterozygous de novo nonsense or frameshift stop mutations in the Activity-Dependent Neuroprotective Protein (ADNP) gene, accounting for a prevalence of 0.2% of all autism cases worldwide. ADNP fulfills an essential chromatin remodeling function during brain development. In this study, we investigated the cerebellum of a died 6-year-old male patient with the c.1676dupA/p.His559Glnfs*3 ADNP mutation. RESULTS The clinical presentation of the patient was representative of the Helsmoortel-Van der Aa syndrome. During his lifespan, he underwent two liver transplantations after which the child died because of multiple organ failure. An autopsy was performed, and various tissue samples were taken for further analysis. We performed a molecular characterization of the cerebellum, a brain region involved in motor coordination, known for its highest ADNP expression and compared it to an age-matched control subject. Importantly, epigenome-wide analysis of the ADNP cerebellum identified CpG methylation differences and expression of multiple pathways causing neurodevelopmental delay. Interestingly, transcription factor motif enrichment analysis of differentially methylated genes showed that the ADNP binding motif was the most significantly enriched. RNA sequencing of the autopsy brain further identified downregulation of the WNT signaling pathway and autophagy defects as possible causes of neurodevelopmental delay. Ultimately, label-free quantification mass spectrometry identified differentially expressed proteins involved in mitochondrial stress and sirtuin signaling pathways amongst others. Protein-protein interaction analysis further revealed a network including chromatin remodelers (ADNP, SMARCC2, HDAC2 and YY1), autophagy-related proteins (LAMP1, BECN1 and LC3) as well as a key histone deacetylating enzyme SIRT1, involved in mitochondrial energy metabolism. The protein interaction of ADNP with SIRT1 was further biochemically validated through the microtubule-end binding proteins EB1/EB3 by direct co-immunoprecipitation in mouse cerebellum, suggesting important mito-epigenetic crosstalk between chromatin remodeling and mitochondrial energy metabolism linked to autophagy stress responses. This is further supported by mitochondrial activity assays and stainings in patient-derived fibroblasts which suggest mitochondrial dysfunctions in the ADNP deficient human brain. CONCLUSION This study forms the baseline clinical and molecular characterization of an ADNP autopsy cerebellum, providing novel insights in the disease mechanisms of the Helsmoortel-Van der Aa syndrome. By combining multi-omic and biochemical approaches, we identified a novel SIRT1-EB1/EB3-ADNP protein complex which may contribute to autophagic flux alterations and impaired mitochondrial metabolism in the Helsmoortel-Van der Aa syndrome and holds promise as a new therapeutic target.
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Affiliation(s)
- Claudio D'Incal
- Department of Medical Genetics, University of Antwerp, Prins Boudewijnlaan 43/6, 2650, Edegem, Antwerp, Belgium
- Protein Chemistry, Proteomics and Epigenetic Signaling (PPES), Epigenetic Signaling lab (PPES), Department of Biomedical Sciences, University of Antwerp, Universiteitsplein 1, 2610, Wilrijk, Antwerp, Belgium
| | - Anke Van Dijck
- Department of Medical Genetics, University of Antwerp, Prins Boudewijnlaan 43/6, 2650, Edegem, Antwerp, Belgium
- Family Medicine and Population Health (FAMPOP), Department of Medicine and Health Sciences, University of Antwerp, Antwerp, Belgium
| | - Joe Ibrahim
- Department of Medical Genetics, University of Antwerp, Prins Boudewijnlaan 43/6, 2650, Edegem, Antwerp, Belgium
| | - Kevin De Man
- Department of Medical Genetics, University of Antwerp, Prins Boudewijnlaan 43/6, 2650, Edegem, Antwerp, Belgium
- Protein Chemistry, Proteomics and Epigenetic Signaling (PPES), Epigenetic Signaling lab (PPES), Department of Biomedical Sciences, University of Antwerp, Universiteitsplein 1, 2610, Wilrijk, Antwerp, Belgium
| | - Lina Bastini
- Protein Chemistry, Proteomics and Epigenetic Signaling (PPES), Epigenetic Signaling lab (PPES), Department of Biomedical Sciences, University of Antwerp, Universiteitsplein 1, 2610, Wilrijk, Antwerp, Belgium
| | - Anthony Konings
- Protein Chemistry, Proteomics and Epigenetic Signaling (PPES), Epigenetic Signaling lab (PPES), Department of Biomedical Sciences, University of Antwerp, Universiteitsplein 1, 2610, Wilrijk, Antwerp, Belgium
| | - Ellen Elinck
- Department of Medical Genetics, University of Antwerp, Prins Boudewijnlaan 43/6, 2650, Edegem, Antwerp, Belgium
| | - Lllana Gozes
- The Elton Laboratory for Molecular Neuroendocrinology, Department of Human Molecular Genetics and Biochemistry, Sackler Faculty of Medicine, Adams Super Center for Brain Studies and Sagol School of Neuroscience, Tel Aviv University, Tel Aviv, Israel
| | - Zlatko Marusic
- Clinical Department of Pathology and Cytology, University Hospital Centre Zagreb, Zagreb, Croatia
| | - Mirna Anicic
- Division of Pediatric Gastroenterology, Hepatology and Nutrition, Department of Pediatrics, School of Medicine, University Hospital Centre Zagreb, Zagreb, Croatia
| | - Jurica Vukovic
- Division of Pediatric Gastroenterology, Hepatology and Nutrition, Department of Pediatrics, School of Medicine, University Hospital Centre Zagreb, Zagreb, Croatia
| | - Nathalie Van der Aa
- Department of Medical Genetics, University of Antwerp, Prins Boudewijnlaan 43/6, 2650, Edegem, Antwerp, Belgium
| | - Ligia Mateiu
- Department of Medical Genetics, University of Antwerp, Prins Boudewijnlaan 43/6, 2650, Edegem, Antwerp, Belgium
| | - Wim Vanden Berghe
- Protein Chemistry, Proteomics and Epigenetic Signaling (PPES), Epigenetic Signaling lab (PPES), Department of Biomedical Sciences, University of Antwerp, Universiteitsplein 1, 2610, Wilrijk, Antwerp, Belgium.
| | - R Frank Kooy
- Department of Medical Genetics, University of Antwerp, Prins Boudewijnlaan 43/6, 2650, Edegem, Antwerp, Belgium.
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Theys C, Ibrahim J, Mateiu L, Mposhi A, García-Pupo L, De Pooter T, De Rijk P, Strazisar M, İnce İA, Vintea I, Rots MG, Vanden Berghe W. Mitochondrial GpC and CpG DNA Hypermethylation Cause Metabolic Stress-Induced Mitophagy and Cholestophagy. Int J Mol Sci 2023; 24:16412. [PMID: 38003603 PMCID: PMC10671279 DOI: 10.3390/ijms242216412] [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: 09/14/2023] [Revised: 10/30/2023] [Accepted: 11/04/2023] [Indexed: 11/26/2023] Open
Abstract
Metabolic dysfunction-associated steatotic liver disease (MASLD) is characterized by a constant accumulation of lipids in the liver. This hepatic lipotoxicity is associated with a dysregulation of the first step in lipid catabolism, known as beta oxidation, which occurs in the mitochondrial matrix. Eventually, this dysregulation will lead to mitochondrial dysfunction. To evaluate the possible involvement of mitochondrial DNA methylation in this lipid metabolic dysfunction, we investigated the functional metabolic effects of mitochondrial overexpression of CpG (MSssI) and GpC (MCviPI) DNA methyltransferases in relation to gene expression and (mito)epigenetic signatures. Overall, the results show that mitochondrial GpC and, to a lesser extent, CpG methylation increase bile acid metabolic gene expression, inducing the onset of cholestasis through mito-nuclear epigenetic reprogramming. Moreover, both increase the expression of metabolic nuclear receptors and thereby induce basal overactivation of mitochondrial respiration. The latter promotes mitochondrial swelling, favoring lipid accumulation and metabolic-stress-induced mitophagy and autophagy stress responses. In conclusion, both mitochondrial GpC and CpG methylation create a metabolically challenging environment that induces mitochondrial dysfunction, which may contribute to the progression of MASLD.
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Affiliation(s)
- Claudia Theys
- Lab Protein Chemistry, Proteomics & Epigenetic Signaling (PPES), Department Biomedical Sciences, University of Antwerp, Wilrijk, 2610 Antwerp, Belgium; (C.T.)
| | - Joe Ibrahim
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, 2650 Edegem, Belgium
- Center for Oncological Research, University of Antwerp and Antwerp University Hospital, 2650 Edegem, Belgium
| | - Ligia Mateiu
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, 2650 Edegem, Belgium
| | - Archibold Mposhi
- Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, 9713 GZ Groningen, The Netherlands
| | - Laura García-Pupo
- Lab Protein Chemistry, Proteomics & Epigenetic Signaling (PPES), Department Biomedical Sciences, University of Antwerp, Wilrijk, 2610 Antwerp, Belgium; (C.T.)
| | - Tim De Pooter
- Neuromics Support Facility, VIB Center for Molecular Neurology, VIB, Wilrijk, 2610 Antwerp, Belgium
- Department of Biomedical Sciences, University of Antwerp, Wirlijk, 2610 Antwerp, Belgium
| | - Peter De Rijk
- Neuromics Support Facility, VIB Center for Molecular Neurology, VIB, Wilrijk, 2610 Antwerp, Belgium
- Department of Biomedical Sciences, University of Antwerp, Wirlijk, 2610 Antwerp, Belgium
| | - Mojca Strazisar
- Neuromics Support Facility, VIB Center for Molecular Neurology, VIB, Wilrijk, 2610 Antwerp, Belgium
- Department of Biomedical Sciences, University of Antwerp, Wirlijk, 2610 Antwerp, Belgium
| | - İkbal Agah İnce
- Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, 9713 GZ Groningen, The Netherlands
- Department of Medical Microbiology, School of Medicine, Acıbadem Mehmet, Ali Aydınlar University, 34752 Ataşehir, İstanbul, Türkiye
| | - Iuliana Vintea
- Pathophysiology Lab, Infla-Med Centre of Excellence, Department of Biomedical Sciences, University of Antwerp, Wilrijk, 2610 Antwerp, Belgium
| | - Marianne G. Rots
- Department of Pathology and Medical Biology, University of Groningen, University Medical Center Groningen, 9713 GZ Groningen, The Netherlands
| | - Wim Vanden Berghe
- Lab Protein Chemistry, Proteomics & Epigenetic Signaling (PPES), Department Biomedical Sciences, University of Antwerp, Wilrijk, 2610 Antwerp, Belgium; (C.T.)
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Janssens K, Neefs I, Ibrahim J, Schepers A, Pauwels P, Peeters M, Van Camp G, Op de Beeck K. Epigenome-wide methylation analysis of colorectal carcinoma, adenoma and normal tissue reveals novel biomarkers addressing unmet clinical needs. Clin Epigenetics 2023; 15:111. [PMID: 37415235 PMCID: PMC10327366 DOI: 10.1186/s13148-023-01516-7] [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: 03/22/2023] [Accepted: 06/01/2023] [Indexed: 07/08/2023] Open
Abstract
BACKGROUND Biomarker discovery in colorectal cancer has mostly focused on methylation patterns in normal and colorectal tumor tissue, but adenomas remain understudied. Therefore, we performed the first epigenome-wide study to profile methylation of all three tissue types combined and to identify discriminatory biomarkers. RESULTS Public methylation array data (Illumina EPIC and 450K) were collected from a total of 1 892 colorectal samples. Pairwise differential methylation analyses between tissue types were performed for both array types to "double evidence" differentially methylated probes (DE DMPs). Subsequently, the identified DMPs were filtered on methylation level and used to build a binary logistic regression prediction model. Focusing on the clinically most interesting group (adenoma vs carcinoma), we identified 13 DE DMPs that could effectively discriminate between them (AUC = 0.996). We validated this model in an in-house experimental methylation dataset of 13 adenomas and 9 carcinomas. It reached a sensitivity and specificity of 96% and 95%, respectively, with an overall accuracy of 96%. Our findings raise the possibility that the 13 DE DMPs identified in this study can be used as molecular biomarkers in the clinic. CONCLUSIONS Our analyses show that methylation biomarkers have the potential to discriminate between normal, precursor and carcinoma tissues of the colorectum. More importantly, we highlight the power of the methylome as a source of markers for discriminating between colorectal adenomas and carcinomas, which currently remains an unmet clinical need.
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Affiliation(s)
- Katleen Janssens
- Centre of Medical Genetics, University of Antwerp and Antwerp University Hospital, Prins Boudewijnlaan 43, 2650, Edegem, Belgium
- Centre for Oncological Research Antwerp (CORE), University of Antwerp and Antwerp University Hospital, Universiteitsplein 1, 2610, Wilrijk, Belgium
| | - Isabelle Neefs
- Centre of Medical Genetics, University of Antwerp and Antwerp University Hospital, Prins Boudewijnlaan 43, 2650, Edegem, Belgium
- Centre for Oncological Research Antwerp (CORE), University of Antwerp and Antwerp University Hospital, Universiteitsplein 1, 2610, Wilrijk, Belgium
| | - Joe Ibrahim
- Centre of Medical Genetics, University of Antwerp and Antwerp University Hospital, Prins Boudewijnlaan 43, 2650, Edegem, Belgium
- Centre for Oncological Research Antwerp (CORE), University of Antwerp and Antwerp University Hospital, Universiteitsplein 1, 2610, Wilrijk, Belgium
| | - Anne Schepers
- Centre of Medical Genetics, University of Antwerp and Antwerp University Hospital, Prins Boudewijnlaan 43, 2650, Edegem, Belgium
| | - Patrick Pauwels
- Centre for Oncological Research Antwerp (CORE), University of Antwerp and Antwerp University Hospital, Universiteitsplein 1, 2610, Wilrijk, Belgium
| | - Marc Peeters
- Centre for Oncological Research Antwerp (CORE), University of Antwerp and Antwerp University Hospital, Universiteitsplein 1, 2610, Wilrijk, Belgium
| | - Guy Van Camp
- Centre of Medical Genetics, University of Antwerp and Antwerp University Hospital, Prins Boudewijnlaan 43, 2650, Edegem, Belgium
- Centre for Oncological Research Antwerp (CORE), University of Antwerp and Antwerp University Hospital, Universiteitsplein 1, 2610, Wilrijk, Belgium
| | - Ken Op de Beeck
- Centre of Medical Genetics, University of Antwerp and Antwerp University Hospital, Prins Boudewijnlaan 43, 2650, Edegem, Belgium.
- Centre for Oncological Research Antwerp (CORE), University of Antwerp and Antwerp University Hospital, Universiteitsplein 1, 2610, Wilrijk, Belgium.
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Neefs I, Tjalma W, Ibrahim J, Croes L, Peeters M, Van Camp G, de Beeck KO. P038 Early detection of breast cancer in liquid biopsies using DNA methylation markers. Breast 2023. [DOI: 10.1016/s0960-9776(23)00157-1] [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: 03/17/2023] Open
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Ibrahim J, Peeters M, Van Camp G, Op de Beeck K. Methylation biomarkers for early cancer detection and diagnosis: Current and future perspectives. Eur J Cancer 2023; 178:91-113. [PMID: 36427394 DOI: 10.1016/j.ejca.2022.10.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [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: 08/25/2022] [Revised: 10/11/2022] [Accepted: 10/17/2022] [Indexed: 11/25/2022]
Abstract
The increase in recent scientific studies on cancer biomarkers has brought great new insights into the field. Moreover, novel technological breakthroughs such as long read sequencing and microarrays have enabled high throughput profiling of many biomarkers, while advances in bioinformatic tools have made the possibility of developing highly reliable and accurate biomarkers a reality. These changes triggered renewed interest in biomarker research and provided tremendous opportunities for enhancing cancer management and improving early disease detection. DNA methylation alterations are known to accompany and contribute to carcinogenesis, making them promising biomarkers for cancer, namely due to their stability, frequency and accessibility in bodily fluids. The advent of newer minimally invasive experimental methods such as liquid biopsies provide the perfect setting for methylation-based biomarker development and application. Despite their huge potential, accurate and robust biomarkers for the conclusive diagnosis of most cancer types are still not routinely used, hence a strong need for sustained research in this field is still needed. This review provides a brief exposition of current methylation biomarkers for cancer diagnosis and early detection, including markers already in clinical use as well as various upcoming ones. It also outlines how recent big data and novel technologies will revolutionise the next generation of cancer tests in supplementing or replacing currently existing invasive techniques.
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Affiliation(s)
- Joe Ibrahim
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, Prins Boudewijnlaan 43, 2650 Edegem, Belgium; Center for Oncological Research, University of Antwerp and Antwerp University Hospital, Wilrijkstraat 10, 2650 Edegem, Belgium
| | - Marc Peeters
- Center for Oncological Research, University of Antwerp and Antwerp University Hospital, Wilrijkstraat 10, 2650 Edegem, Belgium; Department of Medical Oncology, Antwerp University Hospital, Wilrijkstraat 10, 2650 Edegem, Belgium
| | - Guy Van Camp
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, Prins Boudewijnlaan 43, 2650 Edegem, Belgium; Center for Oncological Research, University of Antwerp and Antwerp University Hospital, Wilrijkstraat 10, 2650 Edegem, Belgium
| | - Ken Op de Beeck
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, Prins Boudewijnlaan 43, 2650 Edegem, Belgium; Center for Oncological Research, University of Antwerp and Antwerp University Hospital, Wilrijkstraat 10, 2650 Edegem, Belgium.
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6
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Ibrahim J, Op de Beeck K, Fransen E, Peeters M, Van Camp G. Genome-wide DNA methylation profiling and identification of potential pan-cancer and tumor-specific biomarkers. Mol Oncol 2022; 16:2432-2447. [PMID: 34978357 PMCID: PMC9208075 DOI: 10.1002/1878-0261.13176] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Revised: 09/28/2021] [Accepted: 12/31/2021] [Indexed: 12/22/2022] Open
Abstract
DNA methylation alterations have already been linked to cancer, and their usefulness for therapy and diagnosis has encouraged research into the human epigenome. Several biomarker studies have focused on identifying cancer types individually, yet common cancer and multi-cancer markers are still underexplored. We used The Cancer Genome Atlas (TCGA) to investigate genome-wide methylation profiles of 14 different cancer types and developed a three-step computational approach to select candidate biomarker CpG sites. In total, 1,991 pan-cancer and between 75 and 1,803 cancer-specific differentially methylated CpG sites were discovered. Differentially methylated blocks and regions were also discovered for the first time on such a large-scale. Through a three-step computational approach, a combination of four pan-cancer CpG markers was identified from these sites and externally validated (AUC = 0.90), maintaining comparable performance across tumor stages. Additionally, 20 tumor-specific CpG markers were identified and made up the final type-specific prediction model, which could accurately differentiate tumor types (AUC = 0.87-0.99). Our study highlights the power of the methylome as a rich source of cancer biomarkers, and the signatures we identified provide a new resource for understanding cancer mechanisms on the wider genomic scale with strong applicability in the context of new minimally invasive cancer detection assays.
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Affiliation(s)
- Joe Ibrahim
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, Prins Boudewijnlaan 43, 2650, Edegem, Belgium.,Center for Oncological Research, University of Antwerp and Antwerp University Hospital, Wilrijkstraat 10, 2650, Edegem, Belgium
| | - Ken Op de Beeck
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, Prins Boudewijnlaan 43, 2650, Edegem, Belgium.,Center for Oncological Research, University of Antwerp and Antwerp University Hospital, Wilrijkstraat 10, 2650, Edegem, Belgium
| | - Erik Fransen
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, Prins Boudewijnlaan 43, 2650, Edegem, Belgium.,StatUa Center for Statistics, University of Antwerp, Prinsstraat 13, 2000, Antwerp, Belgium
| | - Marc Peeters
- Center for Oncological Research, University of Antwerp and Antwerp University Hospital, Wilrijkstraat 10, 2650, Edegem, Belgium.,Department of Medical Oncology, Antwerp University Hospital, Wilrijkstraat 10, 2650, Edegem, Belgium
| | - Guy Van Camp
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, Prins Boudewijnlaan 43, 2650, Edegem, Belgium.,Center for Oncological Research, University of Antwerp and Antwerp University Hospital, Wilrijkstraat 10, 2650, Edegem, Belgium
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Lai MY, Rafieqin N, Lee PYL, Amir Rawa MS, Dzul S, Yahaya N, Abdullah FH, Othman N, Jelip J, Ooi CH, Ibrahim J, Aung M, Abdullah AH, Laili Z, Lau YL. High incidence of Plasmodium knowlesi malaria compared to other human malaria species in several hospitals in Malaysia. Trop Biomed 2021; 38:248-253. [PMID: 34362867 DOI: 10.47665/tb.38.3.065] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Through the regional control programme, Malaysia has been successfully reducing the incidence of Plasmodium falciparum and Plasmodium vivax infections. However, the incidence of zoonotic malaria Plasmodium knowlesi infection is increasing and now has been the major cause of malaria in Malaysia especially Malaysian Borneo. The emergence of knowlesi infection has threatened the malaria elimination programme which the government aims to reduce the overall malaria infections by 2020. Unlike other benign human Plasmodium spp., P. knowlesi can cause fatal infections. The aim of this study was to determine the incidence and distribution of five human malaria parasites including P. knowlesi in Peninsular Malaysia and Malaysian Borneo. A total of 112 blood samples were collected from seven states and district hospitals in Peninsular Malaysia and Malaysian Borneo from year 2015 to 2016. The samples were examined by microscopy and further confirmed by nested PCR assay targeting 18S rRNA gene of Plasmodium spp. Following the nested PCR assays, a total of 54 (48.2%) samples were positive for P. knowlesi infections, 12 (10.7%) cases were positive for P. vivax infections, followed by 7 (6.3%) cases of P. falciparum and 4 (3.5%) cases of P. malariae. There were 3 cases (2.7%) of mixed infections (P. knowlesi/P. vivax). However, no cases were identified as P. ovale. A total of 32 (28.6%) cases were found as negative infections. LoopMediated Isothermal Amplification Assay (LAMP) was performed to confirm inconclusive results produced by microscopy and nested PCR. P. knowlesi showed the highest prevalence in Sarawak (n= 30), Sabah (n=13), Pulau Pinang (n=5) and Pahang (n=6). PCR and LAMP was not able to detect a large number of microscopy positive samples due to DNA degradation during storage and shipping. Among all the states involved in this study, the highest prevalence of P. knowlesi infection was found in Sabah and Sarawak.
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Affiliation(s)
- M Y Lai
- Department of Parasitology, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - N Rafieqin
- Department of Parasitology, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - P Y Lee Lee
- Department of Parasitology, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - M S Amir Rawa
- Department of Parasitology, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - S Dzul
- Department of Parasitology, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - N Yahaya
- Jabatan Kesihatan Negeri Pulau Pinang, 10590 Pulau Pinang, Malaysia
| | - F H Abdullah
- Pusat Penyelidikan Klinikal, Hospital Sultanah Nur Zahirah, 20400 Kuala Terengganu, Malaysia
| | - N Othman
- Microbiology Unit, Department of Pathology, Hospital Sultanah Nur Zahirah, Jalan Sultan Mahmud, 20400 Kuala Terengganu, Malaysia
| | - J Jelip
- Ministry of Health Malaysia, 62590 Putrajaya, Malaysia
| | - C H Ooi
- Sarawak State Health Department, 03050 Kuching, Sarawak
| | - J Ibrahim
- Sarawak State Health Department, 03050 Kuching, Sarawak
| | - M Aung
- Hospital Kuala Lipis, 27200 Kuala Lipis, Pahang
| | | | - Z Laili
- Hospital Raja Permaisuri Bainun, 30450 Ipoh, Perak
| | - Y L Lau
- Department of Parasitology, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
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Ibrahim J, Bukhari S, Nieves R, Barakat A, Shpilsky D, Hynal K, Soman P. DSPECT-specific normal limits for LV measurements: a new approach to derivation. Eur Heart J Cardiovasc Imaging 2021. [DOI: 10.1093/ehjci/jeab111.040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Abstract
Funding Acknowledgements
Type of funding sources: None.
Background
Differences in spatial resolution and image filtering between the solid-state DSPECT and traditional Anger SPECT (A-SPECT) cameras are likely to result in differences in LV measurements. However, DSPECT- specific normal values have not been systematically derived. We used healthy organ-donor subjects from our high-volume solid organ transplant center for derivation of normal values.
Purpose
To report DSPECT-specific LV measurements normal limits derived from a unique cohort of donor subjects.
Methods
Subjects were 92 consecutive kidney or liver donors who underwent single day rest (5 mCi)- stress (15mCi) Tc-99m sestamibi gated SPECT myocardial perfusion imaging (MPI) on the DSPECT for pre-operative evaluation. Exclusion criteria included any cardiac disease or medications. LV measurements were made on the post-stress supine stress images using QGS®.
Results
Of 92 subjects (mean age 54.4 ± 15.0 and 39% men), mean EF for women and men were 77.2 ± 14.1% and 70.0 ± 14.7%, respectively. Mean end-diastolic volume for women and men were 67.0 ± 32.2 ml and 99.6 ± 51.6 ml (indexed 38.3 ± 17.2 ml/m2 and 48.1 ± 25.9 ml/m2), respectively. Mean LV wall volume for women and men were 95.9 ± 26.0 ml and 112.0 ± 48.8 ml (indexed 55.0 ± 13.8 ml/m2 and 54.1 ± 24.6 ml/m2), respectively.
Conclusion
We report DSPECT-specific LV measurements from normal subjects from which limits of normality can be derived for clinic use. Organ-donors who undergo pre-operative MPI are a suitable cohort for the derivation of normal values.
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Affiliation(s)
- J Ibrahim
- University Of Pittsburgh Medical Centre, Department of Internal Medicine, Pittsburgh, United States of America
| | - S Bukhari
- University Of Pittsburgh Medical Centre, Division of Cardiology, Pittsburgh, United States of America
| | - R Nieves
- University Of Pittsburgh Medical Centre, Division of Cardiology, Pittsburgh, United States of America
| | - A Barakat
- University Of Pittsburgh Medical Centre, Division of Cardiology, Pittsburgh, United States of America
| | - D Shpilsky
- University Of Pittsburgh Medical Centre, Division of Cardiology, Pittsburgh, United States of America
| | - K Hynal
- University Of Pittsburgh Medical Centre, Division of Cardiology, Pittsburgh, United States of America
| | - P Soman
- University Of Pittsburgh Medical Centre, Division of Cardiology, Pittsburgh, United States of America
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9
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Ibrahim J, De Schutter E, Op de Beeck K. GSDME: A Potential Ally in Cancer Detection and Treatment. Trends Cancer 2021; 7:392-394. [PMID: 33422423 DOI: 10.1016/j.trecan.2020.12.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [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: 09/22/2020] [Revised: 11/26/2020] [Accepted: 12/01/2020] [Indexed: 01/12/2023]
Abstract
Gasdermin E (GSDME) is an executioner of caspase-3 mediated regulated pyroptosis, and as such plays an important role in several cancers. Recent findings highlighted the potential of GSDME as a biomarker that can be implemented in cancer diagnosis, monitoring, and therapy.
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Affiliation(s)
- J Ibrahim
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, Prins Boudewijnlaan 43/6, 2650 Edegem, Antwerp, Belgium; Center for Oncological Research (CORE), Integrated Personalized and Precision Oncology Network (IPPON), University of Antwerp and Antwerp University Hospital, Universiteitsplein 1, 2610 Wilrijk, Antwerp, Belgium
| | - E De Schutter
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, Prins Boudewijnlaan 43/6, 2650 Edegem, Antwerp, Belgium; Molecular Signaling and Cell Death Unit, VIB Center for Inflammation Research, VIB, Technologiepark 71, 9052 Ghent, Belgium; Department of Biomedical Molecular Biology, Gent University, Technologiepark 71, 9052 Ghent, Belgium
| | - K Op de Beeck
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, Prins Boudewijnlaan 43/6, 2650 Edegem, Antwerp, Belgium; Center for Oncological Research (CORE), Integrated Personalized and Precision Oncology Network (IPPON), University of Antwerp and Antwerp University Hospital, Universiteitsplein 1, 2610 Wilrijk, Antwerp, Belgium.
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De Schutter E, Croes L, Ibrahim J, Pauwels P, Op de Beeck K, Vandenabeele P, Van Camp G. GSDME and its role in cancer: From behind the scenes to the front of the stage. Int J Cancer 2020; 148:2872-2883. [PMID: 33186472 DOI: 10.1002/ijc.33390] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [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: 08/25/2020] [Revised: 10/23/2020] [Accepted: 11/02/2020] [Indexed: 12/19/2022]
Abstract
Gasdermin E (GSDME), a gene originally involved in hereditary hearing loss, has been associated with several types of cancer in the last two decades. Recently, GSDME was identified as a pore-forming molecule, which is activated following caspase-3-mediated cleavage resulting in so-called secondary necrosis following apoptotic cell death, or in primary necrotic cell death without an apoptotic phase, so-called pyroptosis-like. This implication in cell death execution suggests its potential role as a tumor suppressor. GSDME also exhibited a cancer type-specific differential methylation pattern between tumor tissues and normal cells, implying GSDME gene methylation as both a pan-cancer and cancer type-specific detection biomarker. A bit paradoxically, GSDME protein expression is considered to be less suited as biomarker, and although its ablation does not protect the cell against eventual cell death, its protein expression might still operate in tumor immunogenicity due to its capacity to induce (secondary) necrotic cell death, which has enhanced immunogenic properties. Additionally, GSDME gene expression has been shown to be associated with favorable prognosis following chemotherapy, and it could therefore be a potential predictive biomarker. We provide an overview of the different associations between GSDME gene methylation, gene expression and tumorigenesis, and explore their potential use in the clinic. Our review only focuses on GSDME and summarizes the current knowledge and most recent advances on GSDME's role in cancer formation, its potential as a biomarker in cancer and on its promising role in immunotherapies and antitumor immune response.
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Affiliation(s)
- Elke De Schutter
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, Antwerp, Belgium.,Molecular Signaling and Cell Death Unit, VIB Center for Inflammation Research, VIB, Ghent, Belgium.,Department of Biomedical Molecular Biology, Gent University, Ghent, Belgium
| | - Lieselot Croes
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, Antwerp, Belgium.,Center for Oncological Research, University of Antwerp and Antwerp University Hospital, Antwerp, Belgium
| | - Joe Ibrahim
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, Antwerp, Belgium.,Center for Oncological Research, University of Antwerp and Antwerp University Hospital, Antwerp, Belgium
| | - Patrick Pauwels
- Center for Oncological Research, University of Antwerp and Antwerp University Hospital, Antwerp, Belgium
| | - Ken Op de Beeck
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, Antwerp, Belgium.,Center for Oncological Research, University of Antwerp and Antwerp University Hospital, Antwerp, Belgium
| | - Peter Vandenabeele
- Molecular Signaling and Cell Death Unit, VIB Center for Inflammation Research, VIB, Ghent, Belgium.,Department of Biomedical Molecular Biology, Gent University, Ghent, Belgium
| | - Guy Van Camp
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, Antwerp, Belgium.,Center for Oncological Research, University of Antwerp and Antwerp University Hospital, Antwerp, Belgium
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De Ridder R, Boudin E, Ibrahim J, Zillikens MC, van der Eerden BC, Van Hul W, Mortier G. Gene set enrichment analysis reveals a first somatic mutation in the catalytic domain of MAP2K1 in a melorheostosis patient. Bone Rep 2020. [DOI: 10.1016/j.bonr.2020.100357] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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Gobir A, Aliyu A, Abubakar A, Ibrahim J, Esekhaigbe C, Joshua A, Adagba K, Muhammed S. Knowledge of heat waves and practice of protective measures against it in a rural West African. Eur J Public Health 2020. [DOI: 10.1093/eurpub/ckaa166.077] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background
Heat wave has a direct linkage to global climate change and is associated with increased morbidity and mortality. Between March and May 2019, Nigeria experienced severe heat waves. Understanding heat waves provides an opportunity for individuals to proactively take measures to prevent its negative health impacts. However, illiteracy levels in rural Sub-Saharan Africa are higher than in urban areas.This study was therefore conducted to assess knowledge of heat waves and practice of protective measures against it in an affected rural community of Nigeria.
Methods
A cross-sectional, community based descriptive study conducted among household heads in Nasarawan Buhari, a rural agrarian community in Nigeria. An interviewer-administered questionnaire was used to collect data from 104 household heads, selected using systematic random sampling technique. Data was analyzed using SPSS (version 20).
Results
A majority of the respondents were males (79.8%) and most of them (89.4%) had poor knowledge of heat waves. Farming occupation was significantly associated with knowledge of heat waves (P = 0.025). Awareness of measures needed to protect against the negative health impacts of heat waves was also poor. Hence fluid intake and cold showers were the only protective measures used by majority of respondents to reduce effect of the extreme heat.
Conclusions
Both knowledge of heat waves and practice of protective measures against it were poor among respondents. A health education intervention on heat waves and how to prevent its negative health impacts was conducted in the community.
Key messages
Due to poor knowledge of heat waves and its negative health effects, practice of protective measures against it was poor among respondents. There is need for more public health response to address this rural public health challenge.
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Affiliation(s)
- A Gobir
- Ahmadu Bello University, Zaria, Nigeria
| | - A Aliyu
- Ahmadu Bello University, Zaria, Nigeria
| | | | - J Ibrahim
- Kaduna State University, Kaduna, Nigeria
| | - C Esekhaigbe
- Ahmadu Bello University Teaching Hospital, Zaria, Nigeria
| | - A Joshua
- Kaduna State University, Kaduna, Nigeria
| | - K Adagba
- Ahmadu Bello University Teaching Hospital, Zaria, Nigeria
| | - S Muhammed
- Ahmadu Bello University Teaching Hospital, Zaria, Nigeria
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De Ridder R, Boudin E, Zillikens MC, Ibrahim J, van der Eerden BCJ, Van Hul W, Mortier G. A multi-omics approach expands the mutational spectrum of MAP2K1-related melorheostosis. Bone 2020; 137:115406. [PMID: 32387835 DOI: 10.1016/j.bone.2020.115406] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 04/26/2020] [Accepted: 05/03/2020] [Indexed: 12/17/2022]
Abstract
Melorheostosis is a very rare sclerosing bone dysplasia characterized by asymmetrical and progressive cortical hyperostosis, usually with involvement of soft tissues surrounding the lesions. Recently Kang et al. identified somatic mosaicism for variants (p.Gln56Pro, p.Lys57Asn, or p.Lys57Glu) in the negative regulatory domain of MAP2K1, resulting in increased ERK1/2 signalling in affected tissues. In our study, we employed several sequencing technologies to unravel genetic variants (only present in affected tissues) from four sporadic melorheostosis patients. In the exome of two patients, we identified the same variants (p.K57N and p.K57E) as previously described by Kang et al. WGS and RNAseq analysis in a third patient demonstrated the presence of a novel variant (p.Cys121Ser) in the catalytic domain of MAP2K1. In addition, gene set enrichment analysis of the transcriptome data demonstrated upregulation of proliferative pathways. Interestingly, increased proliferation of MAP2K1 p.Lys57Asn-positive osteoblasts has been reported by Kang et al. The variants located in the hotspot region of the negative regulatory domain as well as this newly identified p.Cys121Ser variant have all been classified as MAP2K1 variants that can constitutively activate the downstream effector Erk. Finally, in a fourth patient with classical radiographic features of melorheostosis, no pathogenic variants could be identified in MAP2K1 or the other candidate genes for melorheostosis (SMAD3; LEMD3; KRAS). In conclusion, our study strongly suggests that not only somatic variants in the regulatory domain of MAP2K1 but also in the catalytic domain can cause melorheostosis. Our observations confirm that mutations in MAP2K1 are a major cause of melorheostosis and also suggest further locus heterogeneity for this disorder.
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Affiliation(s)
- Raphaël De Ridder
- Center of Medical Genetics, Antwerp University Hospital and University of Antwerp, Antwerp, Belgium
| | - Eveline Boudin
- Center of Medical Genetics, Antwerp University Hospital and University of Antwerp, Antwerp, Belgium
| | - M Carola Zillikens
- Division of Endocrinology, Department of Internal Medicine, Erasmus Medical Center, Rotterdam, the Netherlands
| | - Joe Ibrahim
- Center of Medical Genetics, Antwerp University Hospital and University of Antwerp, Antwerp, Belgium
| | - Bram C J van der Eerden
- Division of Endocrinology, Department of Internal Medicine, Erasmus Medical Center, Rotterdam, the Netherlands
| | - Wim Van Hul
- Center of Medical Genetics, Antwerp University Hospital and University of Antwerp, Antwerp, Belgium
| | - Geert Mortier
- Center of Medical Genetics, Antwerp University Hospital and University of Antwerp, Antwerp, Belgium.
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Boons G, Vandamme T, Ibrahim J, Roeyen G, Driessen A, Peeters D, Lawrence B, Print C, Peeters M, Van Camp G, Op de Beeck K. PDX1 DNA Methylation Distinguishes Two Subtypes of Pancreatic Neuroendocrine Neoplasms with a Different Prognosis. Cancers (Basel) 2020; 12:cancers12061461. [PMID: 32512761 PMCID: PMC7352978 DOI: 10.3390/cancers12061461] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 05/30/2020] [Accepted: 06/02/2020] [Indexed: 02/06/2023] Open
Abstract
DNA methylation is a crucial epigenetic mechanism for gene expression regulation and cell differentiation. Furthermore, it was found to play a major role in multiple pathological processes, including cancer. In pancreatic neuroendocrine neoplasms (PNENs), epigenetic deregulation is also considered to be of significance, as the most frequently mutated genes have an important function in epigenetic regulation. However, the exact changes in DNA methylation between PNENs and the endocrine cells of the pancreas, their likely cell-of-origin, remain largely unknown. Recently, two subtypes of PNENs have been described which were linked to cell-of-origin and have a different prognosis. A difference in the expression of the transcription factor PDX1 was one of the key molecular differences. In this study, we performed an exploratory genome-wide DNA methylation analysis using Infinium Methylation EPIC arrays (Illumina) on 26 PNENs and pancreatic islets of five healthy donors. In addition, the methylation profile of the PDX1 region was used to perform subtyping in a global cohort of 83 PNEN, 2 healthy alpha cell and 3 healthy beta cell samples. In our exploratory analysis, we identified 26,759 differentially methylated CpGs and 79 differentially methylated regions. The gene set enrichment analysis highlighted several interesting pathways targeted by altered DNA methylation, including MAPK, platelet-related and immune system-related pathways. Using the PDX1 methylation in 83 PNEN, 2 healthy alpha cell and 3 healthy beta cell samples, two subtypes were identified, subtypes A and B, which were similar to alpha and beta cells, respectively. These subtypes had different clinicopathological characteristics, a different pattern of chromosomal alterations and a different prognosis, with subtype A having a significantly worse prognosis compared with subtype B (HR 0.22 [95% CI: 0.051–0.95], p = 0.043). Hence, this study demonstrates that several cancer-related pathways are differently methylated between PNENs and normal islet cells. In addition, we validated the use of the PDX1 methylation status for the subtyping of PNENs and its prognostic importance.
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Affiliation(s)
- Gitta Boons
- Center for Oncological Research, University of Antwerp and Antwerp University Hospital, 2610 Antwerp, Belgium; (G.B.); (T.V.); (J.I.); (M.P.); (G.V.C.)
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, 2650 Edegem, Belgium
| | - Timon Vandamme
- Center for Oncological Research, University of Antwerp and Antwerp University Hospital, 2610 Antwerp, Belgium; (G.B.); (T.V.); (J.I.); (M.P.); (G.V.C.)
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, 2650 Edegem, Belgium
- Section of Endocrinology, Department of Internal Medicine, Erasmus Medical Center, 3015GD Rotterdam, The Netherlands
- NETwerk, Antwerp University Hospital, 2650 Edegem, Belgium
| | - Joe Ibrahim
- Center for Oncological Research, University of Antwerp and Antwerp University Hospital, 2610 Antwerp, Belgium; (G.B.); (T.V.); (J.I.); (M.P.); (G.V.C.)
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, 2650 Edegem, Belgium
| | - Geert Roeyen
- Department of Hepatobiliary, Endocrine and Transplantation Surgery, Antwerp University Hospital, 2650 Edegem, Belgium;
| | - Ann Driessen
- Department of Pathology, Antwerp University Hospital and University of Antwerp, 2650 Edegem, Belgium;
| | - Dieter Peeters
- Histopathology, Imaging and Quantification Unit, HistoGeneX, 2610 Antwerp, Belgium;
- Department of Pathology, AZ Sint-Maarten, 2800 Mechelen, Belgium
| | - Ben Lawrence
- Discipline of Oncology, Faculty of Medicine and Health Sciences, University of Auckland, Auckland 1023, New Zealand;
- Maurice Wilkins Centre Hosted by the University of Auckland, Auckland 1023, New Zealand;
| | - Cristin Print
- Maurice Wilkins Centre Hosted by the University of Auckland, Auckland 1023, New Zealand;
- Department of Molecular Medicine and Pathology, School of Medical Sciences, Faculty of Medicine and Health Sciences, University of Auckland, Auckland 1023, New Zealand
| | - Marc Peeters
- Center for Oncological Research, University of Antwerp and Antwerp University Hospital, 2610 Antwerp, Belgium; (G.B.); (T.V.); (J.I.); (M.P.); (G.V.C.)
| | - Guy Van Camp
- Center for Oncological Research, University of Antwerp and Antwerp University Hospital, 2610 Antwerp, Belgium; (G.B.); (T.V.); (J.I.); (M.P.); (G.V.C.)
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, 2650 Edegem, Belgium
| | - Ken Op de Beeck
- Center for Oncological Research, University of Antwerp and Antwerp University Hospital, 2610 Antwerp, Belgium; (G.B.); (T.V.); (J.I.); (M.P.); (G.V.C.)
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, 2650 Edegem, Belgium
- Correspondence: ; Tel.: +32-3275-97-91
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Ibrahim J, Op de Beeck K, Fransen E, Peeters M, Van Camp G. The Gasdermin E Gene Has Potential as a Pan-Cancer Biomarker, While Discriminating between Different Tumor Types. Cancers (Basel) 2019; 11:cancers11111810. [PMID: 31752152 PMCID: PMC6896019 DOI: 10.3390/cancers11111810] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Revised: 11/04/2019] [Accepted: 11/06/2019] [Indexed: 01/08/2023] Open
Abstract
Due to the elevated rates of incidence and mortality of cancer, early and accurate detection is crucial for achieving optimal treatment. Molecular biomarkers remain important screening and detection tools, especially in light of novel blood-based assays. DNA methylation in cancer has been linked to tumorigenesis, but its value as a biomarker has not been fully explored. In this study, we have investigated the methylation patterns of the Gasdermin E gene across 14 different tumor types using The Cancer Genome Atlas (TCGA) methylation data (N = 6502). We were able to identify six CpG sites that could effectively distinguish tumors from normal samples in a pan-cancer setting (AUC = 0.86). This combination of pan-cancer biomarkers was validated in six independent datasets (AUC = 0.84–0.97). Moreover, we tested 74,613 different combinations of six CpG probes, where we identified tumor-specific signatures that could differentiate one tumor type versus all the others (AUC = 0.79–0.98). In all, methylation patterns exhibited great variation between cancer and normal tissues, but were also tumor specific. Our analyses highlight that a Gasdermin E methylation biomarker assay, not only has the potential for being a methylation-specific pan-cancer detection marker, but it also possesses the capacity to discriminate between different types of tumors.
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Affiliation(s)
- Joe Ibrahim
- Centre of Medical Genetics, University of Antwerp and Antwerp University Hospital, Prins Boudewijnlaan 43, 2650 Edegem, Belgium; (J.I.); (K.O.d.B.); (E.F.)
- Centre for Oncological Research, University of Antwerp and Antwerp University Hospital, Wilrijkstraat 10, 2650 Edegem, Belgium;
| | - Ken Op de Beeck
- Centre of Medical Genetics, University of Antwerp and Antwerp University Hospital, Prins Boudewijnlaan 43, 2650 Edegem, Belgium; (J.I.); (K.O.d.B.); (E.F.)
- Centre for Oncological Research, University of Antwerp and Antwerp University Hospital, Wilrijkstraat 10, 2650 Edegem, Belgium;
| | - Erik Fransen
- Centre of Medical Genetics, University of Antwerp and Antwerp University Hospital, Prins Boudewijnlaan 43, 2650 Edegem, Belgium; (J.I.); (K.O.d.B.); (E.F.)
- StatUa Centre for Statistics, University of Antwerp, 2000 Antwerp, Belgium
| | - Marc Peeters
- Centre for Oncological Research, University of Antwerp and Antwerp University Hospital, Wilrijkstraat 10, 2650 Edegem, Belgium;
- Department of Medical Oncology, Antwerp University Hospital, Wilrijkstraat 10, 2650 Edegem, Belgium
| | - Guy Van Camp
- Centre of Medical Genetics, University of Antwerp and Antwerp University Hospital, Prins Boudewijnlaan 43, 2650 Edegem, Belgium; (J.I.); (K.O.d.B.); (E.F.)
- Centre for Oncological Research, University of Antwerp and Antwerp University Hospital, Wilrijkstraat 10, 2650 Edegem, Belgium;
- Correspondence: ; Tel.: +32-3275-9762
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Dudek C, Ramirez J, Little I, Wiser K, Papa L, Ibrahim J. 375 Is the Use of Thromboelastography in the Acute Young Trauma Patient Associated With Outcome and the Type and Amount of Blood Products Received? Ann Emerg Med 2019. [DOI: 10.1016/j.annemergmed.2019.08.336] [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: 11/16/2022]
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Ibrahim J, Op de Beeck K, Fransen E, Croes L, Beyens M, Suls A, Vanden Berghe W, Peeters M, Van Camp G. Methylation analysis of Gasdermin E shows great promise as a biomarker for colorectal cancer. Cancer Med 2019; 8:2133-2145. [PMID: 30993897 PMCID: PMC6536921 DOI: 10.1002/cam4.2103] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Revised: 03/05/2019] [Accepted: 03/05/2019] [Indexed: 12/17/2022] Open
Abstract
In addition to its implication in hereditary hearing loss, the Gasdermin E (GSDME) gene is also a tumor suppressor involved in cancer progression through programmed cell death. GSDME epigenetic silencing through methylation has been shown in some cancer types, but studies are yet to fully explore its diagnostic/prognostic potential in colorectal cancer on a large-scale. We used public data from The Cancer Genome Atlas (TCGA) to investigate differences in GSDME methylation and expression between colorectal cancer and normal colorectal tissue, and between left- and right-sided colorectal cancers in 432 samples. We also explored GSDME's diagnostic capacity as a biomarker for colorectal cancer. We observed differential methylation in all 22 GSDME CpGs between tumor and normal tissues, and in 18 CpGs between the left- and right-sided groups. In the cancer tissue, putative promoter probes were hypermethylated and gene body probes were hypomethylated, while this pattern was inversed in normal tissues. Both putative promoter and gene body CpGs correlated well together but formed distinct methylation patterns with the putative promoter exhibiting the most pronounced methylation differences between tumor and normal tissues. Clinicopathological parameters, excluding age, did not show any effect on CpG methylation. Although the methylation of 5 distinct probes was a good predictor of gene expression, we could not identify an association between GSDME methylation and expression in general. Survival analysis showed no association between GSDME methylation and expression on 5-year patient survival. Through logistic regression, we identified a combination of 2 CpGs, that can discriminate between cancer and normal tissue with high accuracy (AUC = 0.95) irrespective of age and tumor stage. We also validated our model in 3 external methylation datasets, from the Gene Expression Omnibus database, and similar results were reached. Our results suggest that GSDME is a promising biomarker for the detection of colorectal cancer.
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Affiliation(s)
- Joe Ibrahim
- Centre of Medical GeneticsUniversity of Antwerp and Antwerp University HospitalEdegemBelgium
- Centre for Oncological ResearchUniversity of Antwerp and Antwerp University HospitalEdegemBelgium
| | - Ken Op de Beeck
- Centre of Medical GeneticsUniversity of Antwerp and Antwerp University HospitalEdegemBelgium
- Centre for Oncological ResearchUniversity of Antwerp and Antwerp University HospitalEdegemBelgium
| | - Erik Fransen
- Centre of Medical GeneticsUniversity of Antwerp and Antwerp University HospitalEdegemBelgium
- StatUa Centre for StatisticsUniversity of AntwerpAntwerpBelgium
| | - Lieselot Croes
- Centre of Medical GeneticsUniversity of Antwerp and Antwerp University HospitalEdegemBelgium
- Centre for Oncological ResearchUniversity of Antwerp and Antwerp University HospitalEdegemBelgium
| | - Matthias Beyens
- Centre of Medical GeneticsUniversity of Antwerp and Antwerp University HospitalEdegemBelgium
- Centre for Oncological ResearchUniversity of Antwerp and Antwerp University HospitalEdegemBelgium
| | - Arvid Suls
- Centre of Medical GeneticsUniversity of Antwerp and Antwerp University HospitalEdegemBelgium
| | - Wim Vanden Berghe
- Laboratory of Protein Chemistry, Proteomics and Epigenetic Signaling, Department of Biomedical SciencesUniversity of AntwerpAntwerpBelgium
| | - Marc Peeters
- Centre for Oncological ResearchUniversity of Antwerp and Antwerp University HospitalEdegemBelgium
- Department of Medical OncologyAntwerp University HospitalEdegemBelgium
| | - Guy Van Camp
- Centre of Medical GeneticsUniversity of Antwerp and Antwerp University HospitalEdegemBelgium
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Croes L, Beyens M, Fransen E, Ibrahim J, Berghe WV, Suls A, Peeters M, Pauwels P, Camp GV, Op de Beeck K. PO-367 DFNA5 methylation: a potential biomarker for breast cancer, on the basis of a large scale analysis in TCGA. ESMO Open 2018. [DOI: 10.1136/esmoopen-2018-eacr25.395] [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: 11/03/2022] Open
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Croes L, Beyens M, Fransen E, Ibrahim J, Vanden Berghe W, Suls A, Peeters M, Pauwels P, Van Camp G, Op de Beeck K. Large-scale analysis of DFNA5 methylation reveals its potential as biomarker for breast cancer. Clin Epigenetics 2018; 10:51. [PMID: 29682089 PMCID: PMC5896072 DOI: 10.1186/s13148-018-0479-y] [Citation(s) in RCA: 70] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Accepted: 03/26/2018] [Indexed: 12/17/2022] Open
Abstract
Background Breast cancer is the most frequent cancer among women worldwide. Biomarkers for early detection and prognosis of these patients are needed. We hypothesized that deafness, autosomal dominant 5 (DFNA5) may be a valuable biomarker, based upon strong indications for its role as tumor suppressor gene and its function in regulated cell death. In this study, we aimed to analyze DFNA5 methylation and expression in the largest breast cancer cohort to date using publicly available data from TCGA, in order to further unravel the role of DFNA5 as detection and/or prognostic marker in breast cancer. We analyzed Infinium HumanMethylation450k data, covering 22 different CpGs in the DFNA5 gene (668 breast adenocarcinomas and 85 normal breast samples) and DFNA5 expression (Agilent 244K Custom Gene Expression: 476 breast adenocarcinomas and 56 normal breast samples; RNA-sequencing: 666 breast adenocarcinomas and 71 normal breast samples). Results DFNA5 methylation and expression were significantly different between breast cancer and normal breast samples. Overall, breast cancer samples showed higher DFNA5 methylation in the putative gene promoter compared to normal breast samples, whereas in the gene body and upstream of the putative gene promoter, the opposite is true. Furthermore, DFNA5 methylation, in 10 out of 22 CpGs, and expression were significantly higher in lobular compared to ductal breast cancers. An important result of this study was the identification of a combination of one CpG in the gene promoter (CpG07504598) and one CpG in the gene body (CpG12922093) of DFNA5, which was able to discriminate between breast cancer and normal breast samples (AUC = 0.93). This model was externally validated in three independent datasets. Moreover, we showed that estrogen receptor state is associated with DFNA5 methylation and expression. Finally, we were able to find a significant effect of DFNA5 gene body methylation on a 5-year overall survival time. Conclusions We conclude that DFNA5 methylation shows strong potential as detection and prognostic biomarker for breast cancer.
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Affiliation(s)
- Lieselot Croes
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, Prins Boudewijnlaan 43/6, BE-2650 Edegem, Antwerp Belgium.,Center for Oncological Research, University of Antwerp and Antwerp University Hospital, Universiteitsplein 1, BE-2610 Wilrijk, Antwerp Belgium
| | - Matthias Beyens
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, Prins Boudewijnlaan 43/6, BE-2650 Edegem, Antwerp Belgium.,Center for Oncological Research, University of Antwerp and Antwerp University Hospital, Universiteitsplein 1, BE-2610 Wilrijk, Antwerp Belgium
| | - Erik Fransen
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, Prins Boudewijnlaan 43/6, BE-2650 Edegem, Antwerp Belgium.,3StatUa Center for Statistics, University of Antwerp, Prinsstraat 13, BE-2000 Antwerp, Belgium
| | - Joe Ibrahim
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, Prins Boudewijnlaan 43/6, BE-2650 Edegem, Antwerp Belgium.,Center for Oncological Research, University of Antwerp and Antwerp University Hospital, Universiteitsplein 1, BE-2610 Wilrijk, Antwerp Belgium
| | - Wim Vanden Berghe
- 4Laboratory of Protein Chemistry, Proteomics and Epigenetic Signaling (PPES), University of Antwerp, Universiteitsplein 1, BE-2610 Wilrijk, Antwerp Belgium
| | - Arvid Suls
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, Prins Boudewijnlaan 43/6, BE-2650 Edegem, Antwerp Belgium
| | - Marc Peeters
- Center for Oncological Research, University of Antwerp and Antwerp University Hospital, Universiteitsplein 1, BE-2610 Wilrijk, Antwerp Belgium
| | - Patrick Pauwels
- Center for Oncological Research, University of Antwerp and Antwerp University Hospital, Universiteitsplein 1, BE-2610 Wilrijk, Antwerp Belgium
| | - Guy Van Camp
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, Prins Boudewijnlaan 43/6, BE-2650 Edegem, Antwerp Belgium
| | - Ken Op de Beeck
- Center of Medical Genetics, University of Antwerp and Antwerp University Hospital, Prins Boudewijnlaan 43/6, BE-2650 Edegem, Antwerp Belgium.,Center for Oncological Research, University of Antwerp and Antwerp University Hospital, Universiteitsplein 1, BE-2610 Wilrijk, Antwerp Belgium
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Ibrahim J, Grapperon AM, Manfredonia F, van den Bergh PY, Attarian S, Rajabally YA. Serial electrophysiology in Guillain-Barré syndrome: A retrospective cohort and case-by-case multicentre analysis. Acta Neurol Scand 2018; 137:335-340. [PMID: 29164611 DOI: 10.1111/ane.12872] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/31/2017] [Indexed: 01/12/2023]
Abstract
OBJECTIVES To assess the usefulness of serial electrophysiology in Guillain-Barré syndrome (GBS) in a multicenter setting and the reasons for change in electrodiagnostic subtypes with serial studies. METHODS We retrospectively analysed serial electrophysiology of 51 patients with GBS from 4 European centres. Proportions of subtypes were determined at each timing. Individual case analyses were also performed where diagnostic changes occurred with either criteria, to ascertain if changes were due to disease progression or criteria inadequacy. RESULTS At first study, comparing old vs new criteria, acute inflammatory demyelinating polyneuropathy (AIDP) was diagnosed in 70.6% vs 51%, axonal GBS in 15.7% vs 39.2%, equivocal forms in 11.8% vs 7.8%. At second study, AIDP was diagnosed in 72.5% vs 52.9%, axonal GBS in 9.8% vs 33.3%, equivocal forms in 15.7% vs 11.7%. Subtype proportions were unchanged, indicating serial studies did not, in the cohort, alter diagnostic rates for each subtype irrespective of criteria used. Individual review of cases where subtype electrodiagnosis changed indicated suboptimal specificity for AIDP/sensitivity for axonal GBS as main cause of diagnostic shifts with old criteria, whereas disease progression explained most changes with new criteria (55.6% vs 81.8%; P = .039). CONCLUSIONS Serial electrophysiology is unhelpful in GBS. Repeat studies cannot represent the gold standard as electrodiagnosis may alter due to disease progression. Changes in electrodiagnosis relate more often to disease progression with new criteria but are more frequently due to suboptimal sensitivity/specificity with old criteria. A single electrophysiological study using the most accurate available criteria appears sufficient in GBS.
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Affiliation(s)
- J. Ibrahim
- Regional Neuromuscular Service; Queen Elizabeth Hospital; University Hospitals of Birmingham; Birmingham UK
| | - A.-M. Grapperon
- Reference Centre for Neuromuscular Diseases and ALS; Centre Hospitalier Universitaire La Timone; Marseille France
| | - F. Manfredonia
- Department of Neurophysiology; Newcross Hospital; Wolverhampton UK
| | - P. Y. van den Bergh
- Department of Neurology; Reference Neuromuscular Centre; Clinques Universitaires St-Luc; Université Catholique de Louvain; Brussels Belgium
| | - S. Attarian
- Reference Centre for Neuromuscular Diseases and ALS; Centre Hospitalier Universitaire La Timone; Marseille France
| | - Y. A. Rajabally
- Regional Neuromuscular Service; Queen Elizabeth Hospital; University Hospitals of Birmingham; Birmingham UK
- School of Life and Health Sciences; Aston Brain Centre; Aston University; Birmingham UK
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Abi Musa Asa’Ari A, Mahmood A, Ibrahim J, Bikmalla S, Maddekar N, Khan S, Hussain I, Abid Q, Satur C, Bogdan C, Ghosh S, Haris M. Lung cancer staging concordance by stage grouping prior to resection. Lung Cancer 2018. [DOI: 10.1016/s0169-5002(18)30087-4] [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: 10/18/2022]
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Murphy B, Bugeja L, Pilgrim J, Ibrahim J. SUICIDE AMONG NURSING HOME RESIDENTS IN AUSTRALIA, 2000–2013: A CASE SERIES STUDY. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.2541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- B. Murphy
- Monash University, Clayton, Victoria, Australia
| | - L. Bugeja
- Monash University, Clayton, Victoria, Australia
| | - J. Pilgrim
- Monash University, Clayton, Victoria, Australia
| | - J. Ibrahim
- Monash University, Clayton, Victoria, Australia
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Murphy B, Ibrahim J, Bugeja L, Pilgrim J. DEATHS FROM RESIDENT-TO-RESIDENT AGGRESSION AMONG NURSING HOME RESIDENTS IN AUSTRALIA, 2000–2013. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.5081] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- B. Murphy
- Department of Forensic Medicine, Monash University, Southbank, Victoria, Australia,
- Victorian Institute of Forensic Medicine, Southbank, Victoria, Australia
| | - J. Ibrahim
- Department of Forensic Medicine, Monash University, Southbank, Victoria, Australia,
- Victorian Institute of Forensic Medicine, Southbank, Victoria, Australia
| | - L. Bugeja
- Department of Forensic Medicine, Monash University, Southbank, Victoria, Australia,
- Victorian Institute of Forensic Medicine, Southbank, Victoria, Australia
| | - J. Pilgrim
- Department of Forensic Medicine, Monash University, Southbank, Victoria, Australia,
- Victorian Institute of Forensic Medicine, Southbank, Victoria, Australia
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25
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Affiliation(s)
- K Ramey
- University of Mississippi Medical Center, 2500 North State Street, Jackson, MS, 39216, USA
| | - J Ibrahim
- Department of Health Sciences, University of Mississippi Medical Center, 2500 North State Street, Jackson, MS, 39216, USA.,Department of Information Management, University of Mississippi Medical Center, 2500 North State Street, Jackson, MS, 39216, USA
| | - R T Brodell
- Department of Dermatology, University of Mississippi Medical Center, 2500 North State Street, Jackson, MS, 39216, USA.,Department of Pathology, University of Mississippi Medical Center, 2500 North State Street, Jackson, MS, 39216, USA.,University of Rochester School of Medicine and Dentistry, 601 Elmwood Ave, Rochester, NY, 14642, USA
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Ibrahim J, Eisen JA, Jospin G, Coil DA, Khazen G, Tokajian S. Genome Analysis of Streptococcus pyogenes Associated with Pharyngitis and Skin Infections. PLoS One 2016; 11:e0168177. [PMID: 27977735 PMCID: PMC5158041 DOI: 10.1371/journal.pone.0168177] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [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: 07/27/2016] [Accepted: 11/25/2016] [Indexed: 12/12/2022] Open
Abstract
Streptococcus pyogenes is a very important human pathogen, commonly associated with skin or throat infections but can also cause life-threatening situations including sepsis, streptococcal toxic shock syndrome, and necrotizing fasciitis. Various studies involving typing and molecular characterization of S. pyogenes have been published to date; however next-generation sequencing (NGS) studies provide a comprehensive collection of an organism’s genetic variation. In this study, the genomes of nine S. pyogenes isolates associated with pharyngitis and skin infection were sequenced and studied for the presence of virulence genes, resistance elements, prophages, genomic recombination, and other genomic features. Additionally, a comparative phylogenetic analysis of the isolates with global clones highlighted their possible evolutionary lineage and their site of infection. The genomes were found to also house a multitude of features including gene regulation systems, virulence factors and antimicrobial resistance mechanisms.
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Affiliation(s)
- Joe Ibrahim
- Department of Natural Sciences, Lebanese American University, School of Arts and Sciences, Byblos, Lebanon
| | - Jonathan A. Eisen
- University of California Davis Genome Center, Davis, California, United States of America
| | - Guillaume Jospin
- University of California Davis Genome Center, Davis, California, United States of America
| | - David A. Coil
- University of California Davis Genome Center, Davis, California, United States of America
| | - Georges Khazen
- Department of Computer Science and Mathematics, Lebanese American University, School of Arts and Sciences, Byblos, Lebanon
| | - Sima Tokajian
- Department of Natural Sciences, Lebanese American University, School of Arts and Sciences, Byblos, Lebanon
- * E-mail:
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27
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Ibrahim J, Mukhopadhyay A, Lostarakos V, Mahmood A, Khan S, Maddekar N, Bikmalla S, Lea A, Satur C, Abid Q, Ghosh S, Haris M. P105 Lung cancer staging – are we getting it right? Thorax 2016. [DOI: 10.1136/thoraxjnl-2016-209333.248] [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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28
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Ibrahim J, Mukhopadhyay A, Lostarakos V, Mahmood A, Khan S, Maddekar N, Hussain I, Lea A, Satur C, Abid Q, Ghosh S, Haris M. P108 Lung cancer resection outcomes in the first year: a 5 year review. Thorax 2016. [DOI: 10.1136/thoraxjnl-2016-209333.251] [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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29
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Alazzawi S, Lynn ELY, Ibrahim J, Wee CA, Raman R. House Dust Mites in Human ear. Trop Biomed 2016; 33:393-395. [PMID: 33579109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
A study was carried out to investigate the presence of mites in human ear in 58 patients (113 ears). Ear scrapings were examined under the microscope by a parasitologist for the presence of house dust mites. Results showed the presence of house dust mites in 8 (7.1%) ears. We can conclude that mites are normal commensals of the external ears in tropical countries.
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Affiliation(s)
- S Alazzawi
- Department of Otorhinolaryngology, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - E L Y Lynn
- Department of Otorhinolaryngology, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - J Ibrahim
- Department of Parasitology, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - C A Wee
- Department of Otorhinolaryngology, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - R Raman
- Department of Otorhinolaryngology, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
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Tijunelyte I, Guenin E, Lidgi-Guigui N, Colas F, Ibrahim J, Toury T, Lamy de la Chapelle M. Nanoplasmonics tuned "click chemistry". Nanoscale 2016; 8:7105-7112. [PMID: 26961136 DOI: 10.1039/c5nr09018k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Nanoplasmonics is a growing field of optical condensed matter science dedicated to optical phenomena at the nanoscale level in metal systems. Extensive research on noble metallic nanoparticles (NPs) has emerged within the last two decades due to their ability to keep the optical energy concentrated in the vicinity of NPs, in particular, the ability to create optical near-field enhancement followed by heat generation. We have exploited these properties in order to induce a localised "click" reaction in the vicinity of gold nanostructures under unfavourable experimental conditions. We demonstrate that this reaction can be controlled by the plasmonic properties of the nanostructures and we propose two physical mechanisms to interpret the observed plasmonic tuning of the "click" chemistry.
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Affiliation(s)
- I Tijunelyte
- Université Paris13, Sorbonne Paris Cité, Laboratoire CSPBAT, CNRS, (UMR7244), 74 rue Marcel Cachin, 93017 Bobigny, France.
| | - E Guenin
- Université Paris13, Sorbonne Paris Cité, Laboratoire CSPBAT, CNRS, (UMR7244), 74 rue Marcel Cachin, 93017 Bobigny, France.
| | - N Lidgi-Guigui
- Université Paris13, Sorbonne Paris Cité, Laboratoire CSPBAT, CNRS, (UMR7244), 74 rue Marcel Cachin, 93017 Bobigny, France.
| | - F Colas
- IFREMER, Centre de Brest, Interfaces and Sensors and Group, BP 70, 29280 Plouzané, France
| | - J Ibrahim
- Université de Technologie de Troyes, Laboratoire de Nanotechnologie et d'Instrumentation Optique, Institut Charles Delaunay, FRE 2848, 12 rue Marie Curie, 10004 Troyes, France
| | - T Toury
- Université de Technologie de Troyes, Laboratoire de Nanotechnologie et d'Instrumentation Optique, Institut Charles Delaunay, FRE 2848, 12 rue Marie Curie, 10004 Troyes, France
| | - M Lamy de la Chapelle
- Université Paris13, Sorbonne Paris Cité, Laboratoire CSPBAT, CNRS, (UMR7244), 74 rue Marcel Cachin, 93017 Bobigny, France.
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Tokajian S, Issa N, Salloum T, Ibrahim J, Farah M. 16S-23S rRNA Gene Intergenic Spacer Region Variability Helps Resolve Closely Related Sphingomonads. Front Microbiol 2016; 7:149. [PMID: 26904019 PMCID: PMC4749711 DOI: 10.3389/fmicb.2016.00149] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Accepted: 01/26/2016] [Indexed: 11/13/2022] Open
Abstract
Sphingomonads comprise a physiologically versatile group many of which appear to be adapted to oligotrophic environments, but several also had features in their genomes indicative of host associations. In this study, the extent variability of the 16S–23S rDNA intergenic spacer (ITS) sequences of 14 ATCC reference sphingomonad strains and 23 isolates recovered from drinking water was investigated through PCR amplification and sequencing. Sequencing analysis of the 16S–23S rRNA gene ITS region revealed that the ITS sizes for all studied isolates varied between 415 and 849 bp, while their G+C content was 42.2–57.9 mol%. Five distinct ITS types were identified: ITSnone (without tRNA genes), ITSAla(TGC), ITSAla(TGC)+Ile(GAT), ITSIle(GAT)+Ala(TGC), and ITS Ile(GAT)+Pseudo. All of the identified tRNAAla(TGC) molecules consisted of 73 bases, and all of the tRNAIle(GAT) molecules consisted of 74 bases. We also detected striking variability in the size of the ITS region among the various examined isolates. Highest variability was detected within the ITS-2. The importance of this study is that this is the first comparison of the 16S–23S rDNA ITS sequence similarities and tRNA genes from sphingomonads. Collectively the data obtained in this study revealed the heterogeneity and extent of variability within the ITS region compared to the 16S rRNA gene within closely related isolates. Sequence and length polymorphisms within the ITS region along with the ITS types (tRNA-containing or lacking and the type of tRNA) and ITS-2 size and sequence similarities allowed us to overcome the limitation we previously encountered in resolving closely related isolates based on the 16S rRNA gene sequence.
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Affiliation(s)
- Sima Tokajian
- Department of Natural Sciences, School of Arts and Sciences, Lebanese American University Byblos, Lebanon
| | - Nahla Issa
- Department of Natural Sciences, School of Arts and Sciences, Lebanese American University Byblos, Lebanon
| | - Tamara Salloum
- Department of Natural Sciences, School of Arts and Sciences, Lebanese American University Byblos, Lebanon
| | - Joe Ibrahim
- Department of Natural Sciences, School of Arts and Sciences, Lebanese American University Byblos, Lebanon
| | - Maya Farah
- Department of Natural Sciences, School of Arts and Sciences, Lebanese American University Byblos, Lebanon
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Ramey K, Ibrahim J, Brodell R. Verruca localization predominately in black tattoo ink: a retrospective case series. J Eur Acad Dermatol Venereol 2015; 30:e34-e36. [DOI: 10.1111/jdv.13283] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- K. Ramey
- University of Mississippi Medical Center; Jackson MS USA
| | - J. Ibrahim
- Department of Health Sciences; University of Mississippi Medical Center; Jackson MS USA
- Department of Information Management; University of Mississippi Medical Center; Jackson MS USA
| | - R.T. Brodell
- Department of Dermatology; University of Mississippi Medical Center; Jackson MS USA
- Department of Pathology; University of Mississippi Medical Center; Jackson MS USA
- University of Rochester School of Medicine and Dentistry; Rochester New York USA
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Al Fahel C, Nassif C, Bou Karroum R, Ibrahim J, Sahakian J, Houchaymi K, Hajj E, Aad P. Folliculogenesis and Oocyte Quality in Awassi Sheep. FASEB J 2015. [DOI: 10.1096/fasebj.29.1_supplement.lb659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | | | - Joe Ibrahim
- Animal ScienceLebanese UniversityDekwanehLebanon
| | | | - Khaled Houchaymi
- Animal Research Unit Lebanese Agricultural Research Institute TerbolLebanon
| | - Elham Hajj
- Animal ScienceLebanese UniversityDekwanehLebanon
| | - Pauline Aad
- Sciences Notre Dame University‐Louaize Zouk MosbehLebanon
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Adekunle J, Ibrahim J, Kucha E. Proximate and Ultimate Analyses of Biocoal Briquettes of Nigerian’s Ogboyaga and Okaba Sub-bituminous Coal. ACTA ACUST UNITED AC 2015. [DOI: 10.9734/bjast/2015/15154] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [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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Greeve K, Bloomer S, Chellew-Hawley M, Clarnette R, Fortnum D, Garton-Smith J, Harney M, Ibrahim J, Kendall P, Koay A, Moody H, Porter S, Scarff Z, Trevaskis G, Yuen K, Walker H. ADVANCE CARE PLANNING, A STEP-BY-STEP GUIDE FOR HEALTH CARE PROFESSIONALS ASSISTING PATIENTS WITH CHRONIC CONDITIONS TO PLAN FOR CARE TOWARDS END OF LIFE. BMJ Support Palliat Care 2013. [DOI: 10.1136/bmjspcare-2013-000491.77] [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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Patel JN, Deal AM, O'Neil BH, Ibrahim J, Sherrill GB, Davies JM, Bernard SA, Goldberg RM, Olajide OA, Atluri P, Inzerillo JJ, McLeod HL, Walko CM. Application of pharmacokinetic (PK)-guided 5-fluorouracil (FU) in clinical practice. J Clin Oncol 2013. [DOI: 10.1200/jco.2013.31.15_suppl.2595] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
2595 Background: Body surface area (BSA)-based dosing of FU results in up to 100-fold inter-individual PK variability. PK-guided FU compared to BSA-based dosing resulted in higher response rates and decreased rate of toxicities in two randomized clinical trials. A paucity of data exists on PK-guided FU dosing in the clinical setting. Methods: A total of 70 colorectal cancer (CRC) patients (pts) from 6 academic and community sites received mFOLFOX6 (FU 2,400 mg/m2over 46 h every 2 wks) +/- bevacizumab. Peripheral blood was obtained 2-44 h after start of FU infusion and AUCs were estimated using an immunoassay at Myriad Genetics. FU doses for cycles 2-4 (C2-4) were adjusted algorithmically to target an area under the concentration-time curve (AUC) of 20-25 mg*h/L. The primary outcome was the % of pts within target AUC by C4, with a secondary outcome of toxicity rates compared to historical data. Comparisons between cycles were made using generalized linear models, accounting for repeated observations within pt. Results: The % of pts within target AUC post C1 and C4 was 30% (17/57, 95%CI: 18-43%) and 46% (24/52, 95%CI: 32-61%), respectively (OR=2.16, p=0.05). For each subsequent cycle, the odds of a pt being within range increases by 28% (p=0.04) (Table). The median dose needed to achieve target AUC at C4 was 2,580 (range 1,920-3,484) mg/m2. The median AUC post C1 and C4 was 19 and 21 mg*h/L, respectively. Less grade 3/4 mucositis and diarrhea were seen compared to historical data (3 v 15% and 6 v 12%, respectively); however, no difference in grade 3/4 neutropenia was noted (27 v 33%). Nine pts were non-evaluable by protocol for PK analysis, largely due to sampling/processing errors. Conclusions: PK-guided FU resulted in a greater number of pts achieving the targeted AUC and fewer pts under-dosed at C4 compared to C1. Individualization of FU dosing in the front-line, community and academic, setting is achievable for the treatment of CRC; however, larger clinical trials are needed to define the clinical utility of PK-guided FU. Clinical trial information: NCT01164215. [Table: see text]
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Affiliation(s)
- Jai Narendra Patel
- University of North Carolina Institute for Pharmacogenomics and Individualized Therapy, Chapel Hill, NC
| | | | - Bert H. O'Neil
- The University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Joe Ibrahim
- Lineberger Comprehensive Cancer Center Biostatistics Core, Chapel Hill, NC
| | | | | | - Stephen A. Bernard
- Division of Hematology and Oncology, University of North Carolina at Chapel Hill, Chapel Hill, NC
| | | | | | | | | | - Howard L. McLeod
- University of North Carolina Eshelman School of Pharmacy, Chapel Hill, NC
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Ithoi I, Mahmud R, Abdul Basher MH, Jali A, Abdulsalam AM, Ibrahim J, Mak JW. Acanthamoeba genotype T4 detected in naturally-infected feline corneas found to be in homology with those causing human keratitis. Trop Biomed 2013; 30:131-40. [PMID: 23665719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/28/2022]
Abstract
A total of 10 out of 65 cornea swab samples from cats with eye symptoms showed Acanthamoeba-like morphology after cultivation. By PCR and DNA sequencing of Acanthamoeba diagnostic fragment 3 (DF3), all 10 isolates from the positive samples were categorized into two homologous groups of AfC1 (PM1, PM2, PM3, PF6, KM7, KF8, KMK9) and AfC2 (PM4, PM5, KFK10) due to the presence of bases A(354) and G(354), respectively. Furthermore, DF3 of AfC1 and AfC2 showed 100% similarity with Genbank reference isolates with the accession numbers DQ087314, EU146073 and U07401, GU808323, which were Acanthamoeba castellanii strains genotype T4 originating from human keratitis. This finding suggests that A. castellani strains have the capability to infect cats and human under favorable conditions.
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Affiliation(s)
- I Ithoi
- Department of Parasitology, Faculty of Medicine, University Malaya, Kuala Lumpur, Malaysia.
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Bonani M, Brockmann J, Cohen CD, Fehr T, Nocito A, Schiesser M, Serra AL, Blum M, Struker M, Frey DF, Wuthrich RP, Kim YW, Park SJ, Kim TH, Kim YH, Kang SW, Webb L, Casula A, Tomson C, Ben-Shlomo Y, Webb L, Casula A, Ben-Shlomo Y, Tomson C, Mansour H, Akl A, Wafa E, El Shahawy M, Palma R, Swaminathan S, Irish AB, Kolonko A, Chudek J, Wiecek A, Vanrenterghem Y, Kuypers D, Katrien DV, Evenepoel P, Claes K, Bammens B, Meijers B, Naesens M, Kolonko A, Chudek J, Wiecek A, Lo S, Chan CK, Yong D, Wong PN, Kwan TH, Cheng YL, Fung KS, Choy BY, Chau KF, Leung CB, Ebben J, Liu J, Chen SC, Collins A, Ho YW, Abelli M, Ferrario DI Torvajana A, Ticozzelli E, Maiga B, Ferrario DI Torvajana A, Patane A, Albrizio P, Gregorini M, Libetta C, Rampino T, Albrizio P, Geraci P, Dal Canton A, Rotter MT, Jacobi J, Pressmar K, Amann K, Eckardt KU, Weidemann A, Muller K, Stein M, Diezemann C, Sefrin A, Babel N, Reinke P, Schachtner T, Costa C, Touscoz GA, Sidoti F, Sinesi F, Mantovani S, Simeone S, Balloco C, Piasentin Alessio E, Messina M, Segoloni G, Cavallo R, Sharma R.K, Kaul DA, Gupta RK, Gupta A, Prasad N, Bhadhuria D, Suresh KJ, Benaboud S, Prie D, Thervet E, Urien S, Legendre C, Souberbielle JC, Hirt D, Friedlander G, Treluyer JM, Courbebaisse M, Arias M, Arias M, Campistol J, Pascual J, Grinyo JM, Hernandez D, Morales JM, Pallardo LM, Seron D, Senecal L, Boucher A, Dandavino R, Boucher A, Colette S, Vallee M, Lafrance JP, Tung-Min Y, Min-Ju W, Cheng-Hsu C, Chi-Hung C, Kuo-Hsiung S, Mei-Chin W, Direkze S, Khorsavi M, Khorsavi M, Stuart S, Goode A, Jones G, Chudek J, Kolonko A, Wiecek A, Massimetti C, Napoletano I, Imperato G, Muratore MT, Fazio S, Pessina G, Brescia F, Feriozzi S, Tanaka K, Sakai K, Futaki A, Hyoudo Y, Muramatsu M, Kawamura T, Shishido S, Hara S, Kushiyama A, Aikawa A, Jankowski K, Gozdowska J, Lewandowska D, Kwiatkowski A, Durlik M, Pruszczyk P, Obi Y, Ichimaru N, Kato T, Okumi M, Kaimori J, Yazawa K, Nonomura N, Isaka Y, Takahara S, Aimele M, Christophe R, Geraldine D, Eric R, Alexandre H, Masson I, Nicolas M, Ivan T, Acil J, Lise T, Aoumeur HA, Laurence D, Pierre D, Etienne C, Lionel R, Nassim K, Emmanuel M, Eric A, Christophe M, Webb L, Casula A, Tomson C, Ben-Shlomo Y, Alexandre K, Pierre B, Jean-Philippe H, Dominique P, Christophe L, Alexei G, Michel D, Shah P, Kute VB, Vanikar A, Gumber M, Modi P, Trivedi H, GoIebiewska J, Debska-Slizien A, Rutkowski B, Domanski L, Dutkiewicz G, Kloda K, Pawlik A, Ciechanowicz A, Binczak-Kuleta A, Rozanski J, Myslak M, Safranow K, Ciechanowski K, Aline CS, Basset T, Delavenne X, Alamartine E, Mariat C, Kloda K, Domanski L, Pawlik A, Bobrek-Lesiakowska K, Wisniewska M, Romanowski M, Safranow K, Kurzawski M, Rozanski J, Myslak M, Ciechanowski K, De Borst M, Baia L, Navis G, Bakker S, Ranghino A, Tognarelli G, Basso E, Messina M, Manzione AM, Daidola G, Segoloni GP, Kimura T, Yagisawa T, Ishikawa N, Sakuma Y, Hujiwara T, Nukui A, Yashi M, Kim JH, Kim SS, Han DJ, Park SK, Randhawa G, Gumber M, Kute VB, Shah P, Patel H, Vanikar A, Modi P, Trivedi H, Taheri S, Goker-Alpan O, Ibrahim J, Nedd K, Shankar S, Lein H, Barshop B, Boyd E, Holida M, Hillman R, Ibrahim J, Mardach R, Wienreb N, Rever B, Forte R, Desai A, Wijatyk A, Chang P, Martin R. Transplantation - clinical I. Nephrol Dial Transplant 2012. [DOI: 10.1093/ndt/gfs230] [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: 11/14/2022] Open
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Ibrahim J. Psychatric morbidity among third year medical students at Ain Shams University, Cairo, Egypt. Eur Psychiatry 2011. [DOI: 10.1016/s0924-9338(11)72249-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
BackgroundMental distress among medical students is often reported. Different psychiatric disorders are found to be under recognized yet common and treatable among medical students. Various previous studies have shown that medical students are subjected to considerable stress over the last decades. The aim of this study was to determine the presence of clinically significant psychiatric morbidity among third year medical students, to explore the effects of the socio demographic background for these outcomes and to analyze gender differences regarding selected psychiatric morbidities.MethodsA cross sectional study is carried out among third year medical students from Ain Shams University. They were assessed using Social Classification Scale and Structured Clinical Interview for DSM-IV (SCID I) to assess psychiatric morbidity.ResultsResponse rate was 98.9%. Prevalence of psychiatric morbidity among our medical students sample was 59.9%. No significant statistical association between psychological morbidity and any of the socio demographic variables. The most prevalent psychiatric diagnosis was found to be depression (47.9%), followed by Generalized Anxiety Disorder (GAD) (44.9%) & Obsessive Compulsive Disorder (OCD) (44.4%). The least prevalent of which was Anorexia Nervosa (0.7%).ConclusionSignificantly high proportion of medical students (59.9%) had ongoing psychiatric condition and that proactive interventions should be addressed to encourage those medical students to seek help for their psychiatric problems. Counseling and preventive mental health services should be an integral part of the routine clinical facilities caring for medical students.
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Nguyen A, Bedrosian A, Henning J, Connolly M, Malhotra A, Cieza-Rubio N, Ibrahim J, Marr M, Barilla R, Rapp M, Ayo D, Tan P, Mushlin H, Berkowitz I, Cohen S, Miller G. Dendritic Cells Are Necessary For Pancreas Viability In Acute Pancreatitis. J Surg Res 2011. [DOI: 10.1016/j.jss.2010.11.406] [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: 10/18/2022]
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Nguyen A, Bedrosian A, Henning J, Connolly M, Malhotra A, Cieza-Rubio N, Ibrahim J, Marr M, Barilla R, Rapp M, Ayo D, Tan P, Mushlin H, Berkowitz I, Cohen S, Miller G. Dendritic Cells Are Necessary For Pancreas Viability In Acute Pancreatitis. J Surg Res 2011. [DOI: 10.1016/j.jss.2010.11.472] [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: 11/28/2022]
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Burnside RD, Ibrahim J, Flora C, Schwartz S, Tepperberg JH, Papenhausen PR, Warburton PE. Interstitial deletion of proximal 8q including part of the centromere from unbalanced segregation of a paternal deletion/marker karyotype with neocentromere formation at 8p22. Cytogenet Genome Res 2011; 132:227-32. [PMID: 21212645 DOI: 10.1159/000322815] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/28/2010] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND/AIMS The 'McClintock mechanism' of chromosome breakage and centromere misdivision, in which a deleted chromosome with its concomitant excised marker or ring chromosome is formed, has been described in approximately one dozen reports. We report a case of a girl with short stature, developmental delay, and dysmorphic features. METHODS Analysis was performed on the proband and father using cytogenetic chromosome analysis and the Affymetrix 6.0 SNP microarray. Fluorescence in situ hybridization (FISH) using a chromosome 8 alpha-satellite probe and immunofluorescence with antibodies to CENP-C were used to examine the centromere positions in these chromosomes. RESULTS An abnormal chromosome 8 with a cytogenetically visible deletion was further defined by SNP array as a 10.6-Mb deletion from 8q11.1→q12.1. FISH with a chromosome 8 alpha-satellite probe demonstrated that the deletion removed a significant portion of the pericentromeric alpha-satellite repeat sequences and proximal q arm. The deleted chromosome 8 appeared to have a constriction at 8p22, suggesting the formation of a neocentromere, even though alpha-satellite sequences still appeared at the normal location. Chromosome analysis of the phenotypically normal father revealed the same deleted chromosome 8, as well as an apparently balancing mosaic marker chromosome 8. FISH studies revealed that the majority of the chromosome 8 alpha-satellite DNA resided in the marker chromosome. Immunofluorescence studies with antibodies to CENP-C, a kinetochore protein, proved the presence of a neocentromere at 8p22. The excision of the marker from the deleted chromosome 8 likely necessitated the formation of a new kinetochore at the 8p22 neocentromere to stabilize the chromosome during mitosis. CONCLUSION This case clearly illustrates the utilization of classic cytogenetics, FISH, and array technologies to better characterize chromosomal abnormalities and provide information on recurrence risks. It also represents a rare case where a neocentromere can form even in the presence of existing alpha-satellite DNA.
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Affiliation(s)
- R D Burnside
- Laboratory Corporation of America, Research Triangle Park, NC 27709, USA.
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Bedeschi C, Ibrahim J, Cardoso C, Loureiro B, Okamoto E, Ribeiro do Valle L, Piemonte M. P2.058 Effects of a new approach to improve the gait performance in dual-task conditions for patients with Parkinson's disease. Parkinsonism Relat Disord 2008. [DOI: 10.1016/s1353-8020(08)70288-8] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Ibrahim J, Stuchi P, Pikel M, Valle L, Piemonte M. P1.075 De.ciency to divide and to sustain attention in patients with Parkinson's disease: correlation with gait and balance dysfunction. Parkinsonism Relat Disord 2008. [DOI: 10.1016/s1353-8020(08)70172-x] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Abstract
BACKGROUND Several event studies, including the Australian Safety and Quality in Healthcare Study, emphasize gaps in safety for hospitalized patients. It is now recognized that system-based factors contribute significantly to risk of adverse events and this has led to a shift in focus of patient safety from the autonomous responsibility of medical clinicians to a systems-based approach. The aim of this study was to determine medical practitioner awareness of, level of engagement in and barriers to engagement in a systems approach to patient safety and quality. METHODS Information from acute and subacute care medical practitioners at a metropolitan public hospital was collected within an anonymous structured electronic survey, a discussion group and key informant interviews. RESULTS There were 73 survey respondents (response rate 7.6%). Fifty-one (69.9%) were unaware of the Institute of Medicine report 'To Err is human'. Thirty-six (49.3%) were unaware of the Australian Quality in Healthcare Study and 12 (16.4%) had read the article. There was a positive relation identified between awareness and seniority. There was a low level of participation in systems-focused quality and safety activities and limited understanding of the role of systems in medical error causation. There was uncertainty about the changing role of medical practitioners in patient safety and perceived lack of skills to effectively engage with hospital management about safety and quality issues. CONCLUSION Several factors are limiting engagement of medical practitioners in a systems approach to patient safety. Increased educational support is needed and may be best focused within clinical effectiveness activities pertinent to practitioner interest and expertise.
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Affiliation(s)
- C Brand
- Clinical Epidemiology and Health Service Evaluation Unit, The Royal Melbourne Hospital, Melbourne, Victoria, Australia.
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Kaufmann W, Nevis K, Qu P, Ibrahim J, Zhou T, Zhou Y, Simpson D, Helms J, Cordeiro-Stone M, Sharpless N. Defective cell cycle checkpoint response to DNA double strand breaks is associated with altered patterns of gene expression. Melanoma Res 2006. [DOI: 10.1097/00008390-200609001-00008] [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: 11/25/2022]
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Hidayatulfathi O, Sallehuddin S, Ibrahim J. Adulticidal activity of some Malaysian plant extracts against Aedes aegypti Linnaeus. Trop Biomed 2004; 21:61-7. [PMID: 16493400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
The adulticidal activity of methanol extracts from three Malaysian plants namely Acorus calamus Linn., Litsea elliptica Blume and Piper aduncum Linn. against adult of Aedes aegypti (L.) were studied. Standard WHO bioassay tests were used to evaluate the effectiveness of these plant extracts. The hexane fraction from methanol extract of Acorus calamus rhizome was the most effective, exhibiting LC50 and LC90 values of 0.04 mgcm(-2) and 0.09 mgcm(-2) respectively. For L. elliptica, the methanol fraction also displayed good adulticidal property with the LC50 and LC90 values of 0.11 mgcm(-2) and 6.08 mgcm(-2) respectively. It is found that hexane fraction of the P. aduncum crude extract was the least effective among the three plants showing LC50 and LC90 values of 0.20 mgcm(-2) and 5.32 mgcm(-2), respectively. However, although A. calamus showed lowest LC values, the LT50 results indicated that the methanol fraction of L. elliptica was most potent extract among the extracts tested.
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Affiliation(s)
- O Hidayatulfathi
- Faculty of Allied Health Sciences, Universiti Kebangsaan Malaysia, Jalan Raja Muda A. Aziz, 50300 Kuala Lumpur, Malaysia
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Elias AD, Ibrahim J, Richardson P, Avigan D, Joyce R, Reich E, McCauley M, Wheeler C, Frei E. The impact of induction duration and the number of high-dose cycles on the long-term survival of women with metastatic breast cancer treated with high-dose chemotherapy with stem cell rescue: an analysis of sequential phase I/II trials from the Dana-Farber/Beth Israel STAMP program. Biol Blood Marrow Transplant 2002; 8:198-205. [PMID: 12017145 DOI: 10.1053/bbmt.2002.v8.pm12017145] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [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] [Indexed: 11/11/2022]
Abstract
Although high-dose chemotherapy (HDC) with stem cell rescue for the treatment of women with metastatic breast cancer (MBC) is currently a controversial strategy, we report the long-term outcomes of women undergoing high-dose therapy for MBC over the past 12 years while participating in a sequence of research studies transitioning between a single to a double intensification approach. Univariate and multivariate analyses provide a framework to understand the prognostic factors important for event-free and overall survival. Between May 1988 and April 1998, we enrolled 188 women with MBC into 3 trials of previously reported sequential transplantation strategies. Trial I (long induction/single transplantation) accepted 62 women in partial or complete response to an unspecified induction therapy and treated them with high-dose CTCb (cyclophosphamide, thiotepa, and carboplatin) supported by marrow or peripheral blood progenitor cells (PBPC). Trial II (long induction/double transplantation) accepted 68 women in partial or complete response to an unspecified induction therapy, and mobilized stem cells with 2 cycles of AF (doxorubicin and 5-fluorouracil) with granulocyte colony-stimulating factor (G-CSF). These women then received 1 cycle of high-dose single-agent melphalan followed 3 to 5 weeks later by CTCb, each with marrow or PBPC support. Trial III (short induction/double transplantation) enrolled 58 women prior to chemotherapy treatment for metastatic disease. Induction/mobilization consisted of 2 cycles given 14 days apart of doxorubicin and G-CSF. In contrast to trials I and II, patients with stable disease or better response to induction were eligible to proceed ahead with 2 cycles of HDC, 1 being CTCb and the other being dose escalated paclitaxel together with high-dose melphalan (TxM). These 2 HDC regimens were administered 5 weeks apart. TxM was given first in 32 patients and CTCb was given first in 26 patients. The median follow-up periods for trials I, II, and III were 98, 62, and 39 months from the initiation of induction chemotherapy and 92, 55, and 36 months from last high-dose therapy, respectively. The patient characteristics upon entry into these trials were similar. Important differences were that only those patients achieving a partial response or better to induction therapy were enrolled and analyzed for trials I and II, but all patients were analyzed on an intent-to-treat basis for trial III, including those who did not receive intensification. The median event-free survival (EFS) times from induction chemotherapy were 13, 19, and 27 months for trials I, II, and III, respectively (III versus I + II, P = .0004; III versus I, P = .0005; III versus II, P = .005; II versus I, P = .25). The median overall survival (OS) times from induction chemotherapy were 30, 29, and 57 months for trials I, II, and III, respectively (III versus I + II, P = .002; III versus I, P = .003; III versus II, P = .009; II versus I, P = .47). By multivariate Cox regression, participation in the short induction/double transplantation trial III and having no prior adjuvant chemotherapy remained favorable prognostic factors for both EFS and OS. The presence of visceral disease shortened EFS, and hormone sensitivity was of borderline significance. No substantive differences in the characteristics of the patient populations between the 3 trials appeared to interact with outcomes. In conclusion, we found that single transplantation in responding patients after long induction achieves a small cohort of long-term survivors, similar to the results reported by other transplantation centers. Adding a cycle of single-agent high-dose melphalan in this context delayed median time to relapse but did not affect long-term EFS or OS. The double transplantation approach using CTCb and TxM early in the course of treatment was associated with the best EFS and overall survival and was safe, feasible, and tolerable. Treatment duration was only 14 weeks, and this treatment option eliminated lengthy induction chemotherapy. Although selection biases may have in part contributed to this effect, a randomized comparison of standard therapy versus short induction/double transplantation is warranted.
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Affiliation(s)
- A D Elias
- Dana-Farber Cancer Institute, Harvard Medical School, Boston, Massachusetts, USA.
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