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Shah KP, Akinkuolie AO, Nguyen HL, Macias C, Puliafito B, Kim DD, Hamburg SI, Yang EH, Kamath MY. ELECTROPHYSIOLOGIC PROPERTIES OF HEART BLOCK INDUCED BY IMMUNE CHECKPOINT INHIBITOR MYOCARDITIS FROM CEMIPLIMAB. JACC CardioOncol 2022. [DOI: 10.1016/j.jaccao.2022.01.089] [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: 10/19/2022] Open
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Tehrani DM, Wang J, Lai P, Desai PS, Nguyen HL, Bang L, Yang EH, Vorobiof G, Nsair A, Aksoy O, Press MC, Parikh RV. Change in Invasively Measured Mean Pulmonary Artery Pressure After Transcatheter Mitral Valve Repair Is Associated With Heart Failure Readmission. Cardiol Res 2021; 12:302-308. [PMID: 34691328 PMCID: PMC8510655 DOI: 10.14740/cr1284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Accepted: 07/02/2021] [Indexed: 11/30/2022] Open
Abstract
Background Pre-existing pulmonary hypertension is associated with poor outcomes after transcatheter mitral valve repair (TMVr) for mitral regurgitation (MR). However, the impact of an immediate change in mean pulmonary artery pressure (ΔmPAP) following TMVr on outcomes is unknown. Methods Patients who underwent TMVr from December 2015 to February 18, 2020 at our institution for symptomatic 3-4+ MR and who had invasive hemodynamics measured immediately pre- and post-TMVR were included. Multivariate Cox regression analysis was performed to examine the association of ΔmPAP (post-TMVr - pre-TMVr mPAP) with the primary endpoint of heart failure (HF) readmission at 1 year. Secondary endpoints included all-cause mortality and the composite endpoint of HF readmission or all-cause mortality at 1 year. Results Among 55 patients, 55% were men, mean age was 72 ± 14.2 years, and mean ΔmPAP was -1.4 ± 8.2 mm Hg. Overall, HF readmission occurred in 14 (25%), death in 10 (18%), and the composite endpoint in 20 (36%) patients. In multivariable analyses, higher ΔmPAP was significantly associated with HF readmission (hazard ratio (HR) = 1.10, 95% confidence interval (CI): 1.00 - 1.21; P = 0.04). ΔmPAP was not associated with death (HR = 1.04, 95% CI: 0.96 - 1.14; P = 0.33), though there was a numerical but statistically non-significant trend towards the composite endpoint (HR = 1.06, 95% CI: 1.00 - 1.13; P = 0.06) driven by HF readmission. Conclusion Higher ΔmPAP immediately following TMVr was associated with increased HF readmission at 1 year. Larger prospective studies are needed to validate these data and further explore the utility of ΔmPAP as a novel hemodynamic parameter to predict post-TMVR outcomes.
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Affiliation(s)
- David M Tehrani
- Division of Cardiology, University of California, Los Angeles, David Geffen School of Medicine, Los Angeles, CA, USA
| | - Jiexi Wang
- Division of Cardiology, University of California, Los Angeles, David Geffen School of Medicine, Los Angeles, CA, USA
| | - Parntip Lai
- Division of Cardiology, University of California, Los Angeles, David Geffen School of Medicine, Los Angeles, CA, USA
| | - Pooja S Desai
- Division of Cardiology, University of California, Los Angeles, David Geffen School of Medicine, Los Angeles, CA, USA
| | - Heajung L Nguyen
- Division of Cardiology, University of California, Los Angeles, David Geffen School of Medicine, Los Angeles, CA, USA
| | - Lisa Bang
- Division of Cardiology, University of California, Los Angeles, David Geffen School of Medicine, Los Angeles, CA, USA
| | - Eric H Yang
- Division of Cardiology, University of California, Los Angeles, David Geffen School of Medicine, Los Angeles, CA, USA
| | - Gabriel Vorobiof
- Division of Cardiology, University of California, Los Angeles, David Geffen School of Medicine, Los Angeles, CA, USA
| | - Ali Nsair
- Division of Cardiology, University of California, Los Angeles, David Geffen School of Medicine, Los Angeles, CA, USA
| | - Olcay Aksoy
- Division of Cardiology, University of California, Los Angeles, David Geffen School of Medicine, Los Angeles, CA, USA
| | - Marcella Calfon Press
- Division of Cardiology, University of California, Los Angeles, David Geffen School of Medicine, Los Angeles, CA, USA.,These authors contributed equally to this article
| | - Rushi V Parikh
- Division of Cardiology, University of California, Los Angeles, David Geffen School of Medicine, Los Angeles, CA, USA.,These authors contributed equally to this article
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Nguyen HL, Do D, Han JK, Boyle N, Lewis M, Feliciano Z. Incessant Atrial Tachycardia as First Presentation of Cardiac Angiosarcoma. JACC Case Rep 2021; 3:619-624. [PMID: 34317589 PMCID: PMC8302794 DOI: 10.1016/j.jaccas.2021.02.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 01/28/2021] [Accepted: 02/25/2021] [Indexed: 11/25/2022]
Abstract
Primary cardiac angiosarcomas are rare malignant tumors with a very poor prognosis. We present a case of a 48-year-old man with no previous cardiac history who developed an incessant focal atrial tachycardia complicated by tachycardia-mediated cardiomyopathy as a consequence of cardiac angiosarcoma. (Level of Difficulty: Beginner.)
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Affiliation(s)
- Heajung L Nguyen
- Division of Cardiology, Department of Medicine, David Geffen School of Medicine at the University of California Los Angeles, Los Angeles, California, USA
| | - Duc Do
- UCLA Cardiac Arrhythmia Center, Ronald Reagan UCLA Medical Center, Los Angeles, California, USA
| | - Janet K Han
- UCLA Cardiac Arrhythmia Center, Ronald Reagan UCLA Medical Center, Los Angeles, California, USA.,Cardiac Electrophysiology Section, Division of Cardiology, Veterans Affairs Greater Los Angeles Healthcare System, Los Angeles, California, USA
| | - Noel Boyle
- UCLA Cardiac Arrhythmia Center, Ronald Reagan UCLA Medical Center, Los Angeles, California, USA
| | - Michael Lewis
- Department of Pathology, Veterans Affairs Greater Los Angeles Healthcare System, Los Angeles, California, USA
| | - Zenaida Feliciano
- UCLA Cardiac Arrhythmia Center, Ronald Reagan UCLA Medical Center, Los Angeles, California, USA.,Cardiac Electrophysiology Section, Division of Cardiology, Veterans Affairs Greater Los Angeles Healthcare System, Los Angeles, California, USA
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Moore JP, Gallotti R, Su J, Nguyen HL, Bedayat A, Prosper A, Buch E. Pulmonary vein and left atrial posterior wall isolation for the treatment of atrial fibrillation: Comparable outcomes for adults with congenital heart disease. J Cardiovasc Electrophysiol 2021; 32:1868-1876. [PMID: 33821546 DOI: 10.1111/jce.15027] [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] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Revised: 03/18/2021] [Accepted: 03/22/2021] [Indexed: 11/30/2022]
Abstract
INTRODUCTION Optimal treatment strategies for ACHD with AF are unknown. This study sought to assess outcomes of pulmonary vein isolation (PVI) ± left atrial (LA), posterior wall isolation (PWI) for adults with congenital heart disease (ACHD), and atrial fibrillation (AF). METHODS A retrospective review of all cryoballoon (CB) PVI ± PWI procedures at a single center over a 3-year period were performed. Clinical characteristics and outcomes for patients with and without ACHD were compared. The primary outcome was the occurrence of atrial tachyarrhythmia at 12-months postablation after a 90-day blanking period. RESULTS Three-hundred and sixteen patients (mean: 63 ± 12 years, [63% male]) underwent CB PVI ± PWI during the study, including 31 (10%) ACHD (simple 35%, moderate 39% complex 26%; nonparoxysmal AF in 52%). ACHD was younger (51 vs. 64 years; p < .001) with a lower CHADS2 DS2 -VASc score (1.2 vs. 2.1; p = .001) but had a greater LA diameter (4.9 vs. 4.0 cm; p < .001) and a number of prior cardioversions (0.9 vs. 0.4; p < .001) versus controls. 12-month freedom from recurrent AF was similar for ACHD and controls (76% vs. 80%; p = .6) and remained nonsignificant in multivariate analysis (hazard ratio: 1.8, 95% confidence interval: 0.7-5.1; p = .22). At 12-months postablation, 75% of ACHD versus 93% of control patients were off antiarrhythmic drug therapy (p = .07). CONCLUSION This study demonstrates younger age and lower conventional stroke risk, yet clinically advanced AF for ACHD relative to controls. CB PVI ± PWI was an effective strategy for the treatment of AF among all forms of ACHD with similar 12-month outcomes as compared to controls.
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Affiliation(s)
- Jeremy P Moore
- Ahmanson/UCLA Adult Congenital Heart Disease Center, David Geffen School of Medicine, Los Angeles, California, USA.,UCLA Cardiac Arrhythmia Center, David Geffen School of Medicine, Los Angeles, California, USA
| | - Roberto Gallotti
- Ahmanson/UCLA Adult Congenital Heart Disease Center, David Geffen School of Medicine, Los Angeles, California, USA.,UCLA Cardiac Arrhythmia Center, David Geffen School of Medicine, Los Angeles, California, USA
| | - Jonathan Su
- Department of Pediatrics, David Geffen School of Medicine, University of California, Los Angeles (UCLA), Los Angeles, California, USA
| | - Heajung L Nguyen
- UCLA Cardiac Arrhythmia Center, David Geffen School of Medicine, Los Angeles, California, USA
| | - Arash Bedayat
- Department of Radiological Sciences, Thoracic and Diagnostic Cardiovascular Imaging, David Geffen School of Medicine, UCLA, Los Angeles, California, USA
| | - Ashley Prosper
- Department of Radiological Sciences, Thoracic and Diagnostic Cardiovascular Imaging, David Geffen School of Medicine, UCLA, Los Angeles, California, USA
| | - Eric Buch
- UCLA Cardiac Arrhythmia Center, David Geffen School of Medicine, Los Angeles, California, USA
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Nguyen HL, Vaseghi M. Confessions of a stressed heart: The brain-heart relationship is complicated. Trends Cardiovasc Med 2021; 32:178-179. [PMID: 33781895 DOI: 10.1016/j.tcm.2021.03.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Accepted: 03/20/2021] [Indexed: 11/18/2022]
Affiliation(s)
- Heajung L Nguyen
- UCLA Cardiac Arrhythmia Center, University of California, 100 Medical Plaza, Suite 660, Los Angeles, CA 90095-1679, United States
| | - Marmar Vaseghi
- UCLA Cardiac Arrhythmia Center, University of California, 100 Medical Plaza, Suite 660, Los Angeles, CA 90095-1679, United States.
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6
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Nguyen HL, Vaseghi M. Ventricular Tachycardia in Dilated Cardiomyopathy: Is it Time for Genetic Testing in All Patients? JACC Clin Electrophysiol 2020; 6:1115-1117. [PMID: 32972545 DOI: 10.1016/j.jacep.2020.05.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Accepted: 05/18/2020] [Indexed: 11/17/2022]
Affiliation(s)
- Heajung L Nguyen
- UCLA Cardiac Arrhythmia Center, University of California, Los Angeles, California, USA
| | - Marmar Vaseghi
- UCLA Cardiac Arrhythmia Center, University of California, Los Angeles, California, USA.
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L Nguyen H, Vaseghi M. Sympathetic Denervation for Treatment of Ventricular Arrhythmias. J Atr Fibrillation 2020; 13:2404. [PMID: 33024504 DOI: 10.4022/jafib.2404] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Revised: 02/22/2020] [Accepted: 03/20/2020] [Indexed: 12/16/2022]
Abstract
Ventricular arrhythmias are a major cause of morbidity and mortality in patients with heart disease. A growing understanding of the cardiac autonomic nervous system's crucial role in the pathogenesis of ventricular arrhythmias has led to the development of several neuromodulation therapies. Sympathetic neuromodulation is being increasingly utilized to treat ventricular arrhythmias refractory to medical therapy and catheter ablation. There is a growing body of preclinical and clinical evidence supporting the use of thoracic epidural anesthesia, stellate ganglion blockade, cardiac sympathetic denervation, and renal denervation in the treatment of recurrent ventricular arrhythmias. This review summarizes the relevant literature and discusses approaches to sympathetic neuromodulation, particularly in the management of scar-related ventricular arrhythmias.
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Affiliation(s)
- Heajung L Nguyen
- UCLA Cardiac Arrhythmia Center, David Geffen School of Medicine at UCLA, Los Angeles, CA
| | - Marmar Vaseghi
- UCLA Cardiac Arrhythmia Center, David Geffen School of Medicine at UCLA, Los Angeles, CA
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Nguyen HL, Chertboonmuang P, Yang E, Vorobiof G, Nsair A, Aksoy O, Calfon-Press M, Parikh R. IMPACT OF CHANGE IN PULMONARY ARTERY PULSATILITY INDEX ON ALL-CAUSE MORTALITY AFTER PERCUTANEOUS MITRAL VALVE REPAIR. J Am Coll Cardiol 2020. [DOI: 10.1016/s0735-1097(20)31939-2] [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: 10/24/2022]
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Affiliation(s)
- Michael T Tanoue
- Division of Cardiology (M.T.T., H.L.N., B.H.W., W.H.S., J.K.H.), University of California Los Angeles
| | | | - Heajung L Nguyen
- Division of Cardiology (M.T.T., H.L.N., B.H.W., W.H.S., J.K.H.), University of California Los Angeles
| | - Troy Sekimura
- David Geffen School of Medicine (T.S.), University of California Los Angeles
| | - Brian H West
- Division of Cardiology (M.T.T., H.L.N., B.H.W., W.H.S., J.K.H.), University of California Los Angeles
| | - David Elashoff
- Department of Biostatistics (D.E.), University of California Los Angeles
| | - William H Suh
- Division of Cardiology (M.T.T., H.L.N., B.H.W., W.H.S., J.K.H.), University of California Los Angeles
| | - Janet K Han
- Division of Cardiology (M.T.T., H.L.N., B.H.W., W.H.S., J.K.H.), University of California Los Angeles
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10
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Trinh QM, Nguyen HL, Do TN, Nguyen VN, Nguyen BH, Nguyen TVA, Sintchenko V, Marais BJ. Tuberculosis and HIV co-infection in Vietnam. Int J Infect Dis 2016; 46:56-60. [PMID: 27044521 DOI: 10.1016/j.ijid.2016.03.021] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [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: 03/24/2016] [Accepted: 03/24/2016] [Indexed: 10/22/2022] Open
Abstract
UNLABELLED Tuberculosis (TB) and human immunodeficiency virus (HIV) infection are leading causes of disease and death in Vietnam, but TB/HIV disease trends and the profile of co-infected patients are poorly described. METHODS We examined national TB and HIV notification data to provide a geographic overview and describe relevant disease trends within Vietnam. We also compared the demographic and clinical profiles of TB patients with and without HIV infection. RESULTS During the past 10 years (2005-2014) cumulative HIV case numbers and deaths increased to 298,151 and 71,332 respectively, but access to antiretroviral therapy (ART) improved and new infections and deaths declined. From 2011-2014 routine HIV testing of TB patients increased from 58.9% to 72.5% and of all TB patients diagnosed with HIV in 2014, 2,803 (72.4%) received ART. The number of multidrug resistant (MDR)-TB cases enrolled for treatment increased almost 3-fold (578 to 1,532) from 2011-2014. The rate of HIV co-infection in MDR and non-MDR TB cases (51/1,532; 3.3% vs 3,774/100,555; 3.8%; OR 0.77, 95% CI 0.7-1.2) was similar in 2014. CONCLUSIONS The care of TB/HIV co-infected patients have shown sustained improvement in Vietnam. Rising numbers of MDR-TB cases is a concern, but this is not "driven" by HIV co-infection.
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Affiliation(s)
- Q M Trinh
- Marie Bashir Institute for Infectious Diseases and Biosecurity (MBI), The University of Sydney, Sydney, Australia; NSW Mycobacterium Reference Laboratory, Centre for Infectious Disease and Microbiology - Public Health, ICPMR, Westmead Hospital, Sydney, Australia; Vietnam National Institute of Hygiene and Epidemiology, Hanoi, Vietnam.
| | - H L Nguyen
- Vietnam Administration of HIV/AIDS Control, Hanoi, Vietnam
| | - T N Do
- Vietnam Administration of HIV/AIDS Control, Hanoi, Vietnam
| | - V N Nguyen
- Vietnam National TB Program, Hanoi, Vietnam
| | - B H Nguyen
- Vietnam National TB Program, Hanoi, Vietnam; International Union Against Tuberculosis and Lung Diseases, Paris, France
| | - T V A Nguyen
- Vietnam National Institute of Hygiene and Epidemiology, Hanoi, Vietnam
| | - V Sintchenko
- Marie Bashir Institute for Infectious Diseases and Biosecurity (MBI), The University of Sydney, Sydney, Australia; NSW Mycobacterium Reference Laboratory, Centre for Infectious Disease and Microbiology - Public Health, ICPMR, Westmead Hospital, Sydney, Australia
| | - B J Marais
- Marie Bashir Institute for Infectious Diseases and Biosecurity (MBI), The University of Sydney, Sydney, Australia
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Trinh QM, Nguyen HL, Nguyen VN, Nguyen TVA, Sintchenko V, Marais BJ. Tuberculosis and HIV co-infection-focus on the Asia-Pacific region. Int J Infect Dis 2016; 32:170-8. [PMID: 25809776 DOI: 10.1016/j.ijid.2014.11.023] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [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: 11/12/2014] [Accepted: 11/24/2014] [Indexed: 12/23/2022] Open
Abstract
Tuberculosis (TB) is the leading opportunistic disease and cause of death in patients with HIV infection. In 2013 there were 1.1 million new TB/HIV co-infected cases globally, accounting for 12% of incident TB cases and 360,000 deaths. The Asia-Pacific region, which contributes more than a half of all TB cases worldwide, traditionally reports low TB/HIV co-infection rates. However, routine testing of TB patients for HIV infection is not universally implemented and the estimated prevalence of HIV in new TB cases increased to 6.3% in 2013. Although HIV infection rates have not seen the rapid rise observed in Sub-Saharan Africa, indications are that rates are increasing among specific high-risk groups. This paper reviews the risks of TB exposure and progression to disease, including the risk of TB recurrence, in this vulnerable population. There is urgency to scale up interventions such as intensified TB case-finding, isoniazid preventive therapy, and TB infection control, as well as HIV testing and improved access to antiretroviral treatment. Increased awareness and concerted action is required to reduce TB/HIV co-infection rates in the Asia-Pacific region and to improve the outcomes of people living with HIV.
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Affiliation(s)
- Q M Trinh
- Marie Bashir Institute for Infectious Diseases and Biosecurity (MBI), The University of Sydney, Sydney, Australia; Centre for Infectious Disease and Microbiology - Public Health, ICPMR, Westmead Hospital, Sydney, Australia; Tuberculosis Laboratory, Vietnam National Institute of Hygiene and Epidemiology, Hanoi, Vietnam.
| | - H L Nguyen
- Vietnam Administration of HIV/AIDS Control, Hanoi, Vietnam
| | - V N Nguyen
- Vietnam National Lung Hospital, Hanoi, Vietnam
| | - T V A Nguyen
- Tuberculosis Laboratory, Vietnam National Institute of Hygiene and Epidemiology, Hanoi, Vietnam
| | - V Sintchenko
- Marie Bashir Institute for Infectious Diseases and Biosecurity (MBI), The University of Sydney, Sydney, Australia; Centre for Infectious Disease and Microbiology - Public Health, ICPMR, Westmead Hospital, Sydney, Australia
| | - B J Marais
- Marie Bashir Institute for Infectious Diseases and Biosecurity (MBI), The University of Sydney, Sydney, Australia
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Mendola A, Schlögel MJ, Ghalamkarpour A, Irrthum A, Nguyen HL, Fastré E, Bygum A, van der Vleuten C, Fagerberg C, Baselga E, Quere I, Mulliken JB, Boon LM, Brouillard P, Vikkula M. Mutations in the VEGFR3 signaling pathway explain 36% of familial lymphedema. Mol Syndromol 2013; 4:257-66. [PMID: 24167460 DOI: 10.1159/000354097] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/06/2013] [Indexed: 12/13/2022] Open
Abstract
Lymphedema is caused by dysfunction of lymphatic vessels, leading to disabling swelling that occurs mostly on the extremities. Lymphedema can be either primary (congenital) or secondary (acquired). Familial primary lymphedema commonly segregates in an autosomal dominant or recessive manner. It can also occur in combination with other clinical features. Nine mutated genes have been identified in different isolated or syndromic forms of lymphedema. However, the prevalence of primary lymphedema that can be explained by these genetic alterations is unknown. In this study, we investigated 7 of these putative genes. We screened 78 index patients from families with inherited lymphedema for mutations in FLT4, GJC2, FOXC2, SOX18, GATA2, CCBE1, and PTPN14. Altogether, we discovered 28 mutations explaining 36% of the cases. Additionally, 149 patients with sporadic primary lymphedema were screened for FLT4, FOXC2, SOX18, CCBE1, and PTPN14. Twelve mutations were found that explain 8% of the cases. Still unidentified is the genetic cause of primary lymphedema in 64% of patients with a family history and 92% of sporadic cases. Identification of those genes is important for understanding of etiopathogenesis, stratification of treatments and generation of disease models. Interestingly, most of the proteins that are encoded by the genes mutated in primary lymphedema seem to act in a single functional pathway involving VEGFR3 signaling. This underscores the important role this pathway plays in lymphatic development and function and suggests that the unknown genes also have a role.
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Nguyen HL, Charpentier C, Nguyen N, de Truchis P, Molina JM, Ruxrungtham K, Delaugerre C. Longitudinal analysis of integrase N155H variants in heavily treated patients failing raltegravir-based regimens. HIV Med 2012; 14:85-91. [PMID: 22994529 DOI: 10.1111/j.1468-1293.2012.01039.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/22/2012] [Indexed: 11/29/2022]
Abstract
OBJECTIVES The mechanism of raltegravir (RAL)-resistant evolutions has not already been elucidated. Because the emergence of RAL resistance is usually initiated by the N155H mutant, we assessed the role of minor N155H-mutated variants in circulating RNA and archived DNA in five heavily treated patients experiencing long-term RAL therapy failure and harbouring three different resistance profiles determined by standard genotyping. METHODS Allele-specific polymerase chain reaction (AS-PCR) was used to detect N155H mutants in longitudinal stored plasma and whole-blood samples before, during and after RAL-based regimens in five patients infected with the HIV-1 B subtype. RESULTS No minor N155H-mutated variant was found by AS-PCR in either plasma or whole-blood samples collected at baseline and after RAL withdrawal in any of the five patients. During RAL failure, the mutation N155H was detected at different levels in three patients displaying the N155H pathway and gradually declined when the double mutant Q148H+G140S was selected in one patient. In two patients with the Q148H resistance pathway, no N155H variant was identified by AS-PCR in either viral RNA or DNA. CONCLUSIONS The N155H mutation present at various levels from minority to majority showed no relationship with the three RAL-associated resistance profiles, suggesting that this mutant may not play a role in determining different resistance profiles. Moreover, pre-existing N155H is very infrequent and, if selected during RAL failure, the N155H mutant disappears quickly after RAL withdrawal.
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Affiliation(s)
- H L Nguyen
- Virology Department, Saint-Louis Hospital, Assistance Publique-Hôpitaux de Paris, INSERM U941, Paris Diderot University, Sorbonne Paris Cité, Paris, France
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14
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Nguyen HL, Leermakers M, Kurunczi S, Bozo L, Baeyens W. Mercury distribution and speciation in Lake Balaton, Hungary. Sci Total Environ 2005; 340:231-246. [PMID: 15752504 DOI: 10.1016/j.scitotenv.2004.08.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2003] [Revised: 08/19/2004] [Accepted: 08/19/2004] [Indexed: 05/24/2023]
Abstract
The distribution and speciation of mercury in air, rain, lake water, sediment, and zooplankton in Lake Balaton (Hungary) were investigated between 1999 and 2002. In air, total gaseous mercury (TGM) ranged from 0.4 to 5.9 ng m(-3) and particulate phase mercury (PPM) from 0.01 to 0.39 ng m(-3). Higher concentrations of both TGM and PPM occurred during daytime. Higher concentrations of PPM occurred in winter. In rain and snow, total mercury ranged from 10.8 to 36.7 ng L(-1) in summer but levels up to 191 ng L(-1) in winter. Monomethylmercury (MMHg) concentrations ranged from 0.09 to 1.26 ng L(-1) and showed no seasonal variations. Total Hg in the unfiltered lake water varied spatially, with concentrations ranging from 1.4 to 6.5 ng L(-1). Approximately 70% of the total Hg is dissolved. MMHg levels ranged from 0.08 to 0.44 ng L(-1) as total and from 0.05 to 0.37 ng L(-1) in the dissolved form. Lower Hg concentrations in the water column occurred in winter. In suspended particulate matter and in sediment, total mercury ranged from 9 to 160 ng g(-1) dw, and MMHg ranged from 0.07 to 0.84 ng g(-1) dw. In zooplankton, an average mercury level of 31.0+/-6.8 ng g(-1) dw occurred, with MMHg accounting for approximately 17%. In sediments, suspended-matter- and zooplankton-high Hg and MMHg levels occurred at the mouth of the River Zala, but, in the lake, higher concentrations occurred on the Northern side, and an increasing trend from north-west to north-east was observed. In general, regarding Hg, Lake Balaton can be considered as a relatively uncontaminated site. The high-pH and well-oxygenated water as well as the low organic matter content of the sediment does not favour the methylation of Hg. In addition, bioconcentration and bioaccumulation factors are relatively low compared to other aquatic systems.
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Affiliation(s)
- H L Nguyen
- Laboratory of Analytical and Environmental Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
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Nguyen HL, Leermakers M, Osán J, Török S, Baeyens W. Heavy metals in Lake Balaton: water column, suspended matter, sediment and biota. Sci Total Environ 2005; 340:213-30. [PMID: 15752503 DOI: 10.1016/j.scitotenv.2004.07.032] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2003] [Revised: 01/05/2004] [Accepted: 07/26/2004] [Indexed: 05/14/2023]
Abstract
During the period 1999-2002, five sampling cruises have been carried out on Lake Balaton to assess trace metal distribution in the lake and to identify major sources. Eighteen elements, including Cr, Co, Ni, Cu, Zn, Cd, Pb (trace metals) and Al, Ba, Ca, Fe, K, Mg, Mn, Na, P, S, Sr (major metals), were determined in one or more of the lake's compartments. Lower trace metal concentrations in rainwater were observed in June and February 2000, while much higher levels were present in September 2001 (during a storm event) and in snow (February 2000). In the Northern and Western parts of the lake, especially at the inflow of river Zala and the locations of the yacht harbours, metal concentrations were higher in almost all compartments. Because the lake is very shallow, storm conditions also change significantly the metal distributions in the dissolved and particulate phases. The Kis-Balaton protection system located on Zala river functions very efficiently for retaining suspended particulate matter (SPM; 72% retention) and associated metals. Metal concentrations in surface sediments of the lake showed a high variability. After normalisation for the fine sediment fraction, only a few stations including Zala mouth appeared to be enriched in trace metals. In zooplankton, Zn seemed to be much more elevated compared to the other trace metals. Based on the molar ratios of the trace metals in the various compartments and input flows of the lake, several trends could be deduced. For example, molar ratios of the trace metals in the dissolved and solid (suspended particulate matter and sediments) phases in the lake are fairly similar to those in Zala River.
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Affiliation(s)
- H L Nguyen
- Laboratory of Analytical and Environmental Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, 1050, Brussels, Belgium
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Hoang TQ, Nguyen HL, Tran NT, Homasson JP. [Evaluation of different fibroscopic sampling techniques for the diagnosis of isolated peripheral pulmonary nodules. A prospective study of 74 cases in Vietnam]. Rev Pneumol Clin 2004; 60:265-268. [PMID: 15687909 DOI: 10.1016/s0761-8417(04)72111-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Isolated pulmonary nodules raise serious diagnostic problems. Combined imaging and endoscopic methods can often avoid exploratory thoracotomy. The situation is different however in developing countries where health facilities and technical availability are quite variable. Bronchial fibroscopy without image guidance can provide the diagnosis is an acceptable number of cases. We conducted a prospective study in 74 patients. After chest x-ray and CT scan of the lesion of interest, bronchial lavage was performed in each patient with brushings samples in 71 and transbronchial biopsy in 68. Riu staining was performed immediately in the endoscopy suite, providing an almost immediate diagnostic approach. The combination of lavage, brushing and biopsy provided a diagnostic yield as good as the brushings and biopsy combination. These endoscopic techniques gave the diagnosis of the specific lesion in 52 cases (70%). Most involved cancer but there were 15 cases of tuberculosis diagnosis, which remains frequent in developing countries.
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Affiliation(s)
- T Q Hoang
- Service de Santé, Hôpital Pham Ngoc Thach, Hô Chi Minh-Ville, Viêt-nam
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Leermakers M, Nguyen HL, Kurunczi S, Vanneste B, Galletti S, Baeyens W. Determination of methylmercury in environmental samples using static headspace gas chromatography and atomic fluorescence detection after aqueous phase ethylation. Anal Bioanal Chem 2003; 377:327-33. [PMID: 12898107 DOI: 10.1007/s00216-003-2116-6] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2003] [Revised: 05/30/2003] [Accepted: 06/12/2003] [Indexed: 11/29/2022]
Abstract
A rapid and automated method for the determination of monomethylmercury (MMHg) in environmental samples was developed using headspace gas chromatography with atomic fluorescence detection in combination with aqueous phase ethylation. Sample preparation steps were optimized for sediments, biological samples, and water samples using certified reference materials and real samples with a broad range of MMHg concentrations. Different extraction procedures were compared for both sediments and biological samples. The methods were applied in the intercomparison exercises for the certification of MMHg in sediments (IAEA 405) and in Oyster tissue (BCR 710) and the results were accepted for certification. The detection limits for MMHg are 0.002 ng Hg/g for sediments and biological samples and 0.01 ng Hg/L for water samples. The method was tested for methylation artifacts; no artifact was observed in the sediment samples and CRMs tested.
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Affiliation(s)
- M Leermakers
- Laboratory of Analytical and Environmental Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium.
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Abstract
The incidence of cutaneous malignant melanoma (CMM) has been rising in fair-skinned populations throughout the world for decades. The upward trend may, however, finally be slowing in some of these populations. Recent (1983-1996) CMM incidence trends for a high incidence area (New South Wales, Australia) have been examined according to gender, age group, body site and tumour thickness. Despite continuing upward trends in older age groups, particularly among men (e.g., 7.20% increase per year in men aged 75+), incidence for younger ages is stabilizing (in men) or declining (in women): average annual percentage changes of -3.03 and -0.88 were observed for women aged 15-34 and 35-54, respectively. Patterns suggest a birth-cohort effect, with those born since 1945 or 1950 having lower (females) or similar (males) rates to those born earlier. For each gender, all-ages incidence rose by a similar amount for each of the main body sites except the leg in women, where incidence fell by 0.49% per year. In men, the incidence of both thin (</=75 mm) and thick (>75 mm) melanomas increased (significantly, by 2.63% per year and non-significantly, by 0.93% per year, respectively) between 1989 and 1996. In women, incidence remained stable for both thickness subgroups. These data are consistent with a stabilization or reduction in either total sun exposure or intermittency of exposure among New South Wales cohorts born since about 1950. Because incidence rates are still much higher than they were a few decades ago, however, efforts to reduce sun exposure, particularly in children and youth, must continue.
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Affiliation(s)
- L D Marrett
- Division of Preventive Oncology, Cancer Care Ontario, Toronto, Ontario, Canada
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Nguyen HL, Gruber D, Bulinski JC. Microtubule-associated protein 4 (MAP4) regulates assembly, protomer-polymer partitioning and synthesis of tubulin in cultured cells. J Cell Sci 1999; 112 ( Pt 12):1813-24. [PMID: 10341201 DOI: 10.1242/jcs.112.12.1813] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.7] [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: 11/20/2022] Open
Abstract
We depleted MAP4, a ubiquitously expressed microtubule (MT)-associated protein previously shown to be capable of stabilizing MTs, from HeLa cells by stably expressing antisense RNA. These HeLa-AS cells, in which the MAP4 level was decreased to 33% of the wild-type level, displayed decreased content of total tubulin (65% of the wild-type level). The partitioning of cellular tubulin into protomer and polymer was altered in HeLa-AS cells: polymeric tubulin was decreased to 46% of the level in control cells, while protomeric tubulin was increased to 226% of the level in control cells. Tubulin protein synthesis was decreased, consistent with the tubulin autoregulation model, which proposes that tubulin protomer inhibits its own synthesis. Following release from drug-induced depolymerization, MTs in HeLa-AS cells reformed more slowly, and showed an increased focus on the centrosome, as compared to control cells. HeLa-AS cells also appeared to be less bipolar in shape and flatter than control cells. Our data suggest that MAP4 regulates assembly level of MTs and, perhaps through this mechanism, is involved in controlling spreading and shape of cells.
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Affiliation(s)
- H L Nguyen
- Departments of Pathology and Anatomy and Cell Biology, Columbia University, College of Physicians and Surgeons, BB1213-630 W. 168th St, New York, NY 10032-3702, USA.
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Nguyen HL, Gruber D, McGraw T, Sheetz MP, Bulinski JC. Stabilization and functional modulation of microtubules by microtubule-associated protein 4. Biol Bull 1998; 194:354-357. [PMID: 9664661 DOI: 10.2307/1543111] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Affiliation(s)
- H L Nguyen
- Department of Anatomy, Columbia University, College of Physicians and Surgeons, New York, New York 10032, USA
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Abstract
We previously prepared cell lines that inducibly overexpress MAP4, a microtubule (MT)-associated protein widely expressed in non-neuronal cells. Overexpression of either the full-length MAP4 molecule or its MT-binding domain, MTB, stabilized MTs and retarded cell growth, suggesting that overexpressed MAP4 impacts on MT-dependent functions in vivo. To test this hypothesis, we examined MT-based vesicle movements in living cells, using high resolution DIC microscopy. Overexpression of either MAP4 or MTB yielded a dose-dependent reduction in the frequency of MT-dependent organelle movements, relative to control cells. At steady state, both MAP4- and MTB-overexpressing cells showed unusual distributions of transferrin, LDL, dextran, and Golgi elements, as compared to control cells. MAP4 preferentially inhibited receptor-dependent uptake and degradation of LDL, and repositioning of Golgi elements after disruption by the drug, brefeldin A. L-MOCK cells treated with Taxol to stabilize the MTs to an extent equivalent to MAP4 overexpression did not show similar inhibition of vesicle motility or organellar trafficking, suggesting that deficits in organelle movements in vivo represent a direct effect of the presence of MAP4 or MTB, rather than an indirect effect of the stabilization of MTs by overexpressed MAP constructs. Our results show that MAP4 has the capacity to affect transport along MTs in vivo; these findings suggest a potential mechanism by which MAP4 could contribute to polarization or morphogenesis of cells.
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Affiliation(s)
- J C Bulinski
- Department of Anatomy, Columbia University, College of Physicians & Surgeons, New York, NY 10032, USA.
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Abstract
OBJECTIVE To determine whether automation could accelerate the parenteral nutrition (PN) ordering and delivery process with concurrent improvements in the quality of nutrition therapy. DESIGN The time required to order, process, and deliver PN orders and specific nutrient composition of the PN solution were collected prospectively for 2 weeks on all neonatal intensive care unit (NICU) patients receiving PN during both the manual phase (before automation) and computer phase of the study. SUBJECTS/SETTING A total of 81 newborn infants in the NICU receiving PN for more than 5 days completed the study. STATISTICAL ANALYSES Student's unpaired t test was used to evaluate differences between computer and manual methods for all outcome variables of interest. RESULTS The time required to write and deliver PN orders was significantly lower using computer rather than manual methods (1.4 +/- 0.2 vs 4.5 +/- 0.5 minutes; P = .0001). Significant improvements in the nutrient composition of the PN solution resulted from use of computer ordering for energy (93.4 +/- 1.48 vs 79.2 +/- 1.8 kcal/kg per day; P = .0001), protein (2.92 +/- 0.02 vs 2.7 +/- 0.03 g protein per kilogram per day; P = .0001), calcium (2.3 +/- 0.1 vs 1.8 +/- 0.1 mEq/kg per day; P = .0005), and phosphate (1.3 +/- 0.06 vs 0.9 +/- 0.06 mM/kg per day; P = .0001). In addition, alkaline phosphatase levels improved (272 +/- 11 vs 404 +/- 25 U/L; P = .0001) and caloric and protein goals were achieved sooner (5.9 +/- 0.4 vs 8.7 +/- 0.8 days; P = .0045) when computer ordering rather than the manual method of ordering PN was used. IMPLICATIONS Our findings indicate that automating the process of writing and delivering PN orders saved time because it eliminated repetitive tasks and tedious calculations previously required of neonatologists, dietitians, and pharmacists. Patient care in our population of neonates was enhanced by improving the nutrient content of the PN solution.
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Affiliation(s)
- M A Puangco
- Department of Pediatrics, Baylor College of Medicine, Houston, TX 77030-6251, USA
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Nguyen HL, Chari S, Gruber D, Lue CM, Chapin SJ, Bulinski JC. Overexpression of full- or partial-length MAP4 stabilizes microtubules and alters cell growth. J Cell Sci 1997; 110 ( Pt 2):281-94. [PMID: 9044058 DOI: 10.1242/jcs.110.2.281] [Citation(s) in RCA: 72] [Impact Index Per Article: 2.7] [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: 11/20/2022] Open
Abstract
To investigate the in vivo functions of MAP4, a microtubule-associated protein expressed almost ubiquitously in vertebrate cells, we prepared stably transfected clonal mouse Ltk- cell lines expressing full-length MAP4 (L-MAP4 cells) or its MT-binding domain (L-MTB cells). Although transfectants showed no dramatic defect in morphology, organellar distribution, or level of MT polymer, as compared to naive Ltk- cells or L-MOCK cells (transfected with vector alone), MTs in L-MAP4 and L-MTB cells showed greater stability than those in control cells, as monitored by the level of post-translationally detyrosinated alpha-tubulin and by a quantitative nocodazole-resistance assay. In vivo, the MT-binding domain of MAP4 stabilized MTs less potently than full-length MAP4, in contrast to the equivalent efficacy demonstrated in studies of in vitro MT polymerization (Aizawa et al. (1991), J. Biol. Chem. 266, 9841–9846), L-MAP4 and L-MTB cells grew significantly more slowly than control cells; this growth inhibition was not due to mitotic arrest or cell death. L-MAP4 and L-MTB cells also exhibited greater tolerance to the MT-depolymerizing agent, nocodazole, but not to the MT-polymerizing agent, Taxol. Our results demonstrate that MAP4 and its MT-binding domain are capable of MT stabilization in vivo, and that increasing the intracellular level of MAP4 affects cell growth parameters.
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Affiliation(s)
- H L Nguyen
- Department of Pathology, Columbia University, College of Physicians & Surgeons, New York, NY 10032, USA
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Scherneck S, Vogel F, Nguyen HL, Feunteun J. Sequence homology between polyoma virus, simian virus 40, and a papilloma-producing virus from a Syrian hamster: evidences for highly conserved sequences. Virology 1984; 137:41-8. [PMID: 6089419 DOI: 10.1016/0042-6822(84)90006-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Sequence homology between the genomes of a hamster papovavirus (HaPV), polyoma virus (Py), and Simian virus 40 (SV40) has been studied by filter hybridization and electron microscopy under conditions of varying stringency. Hybrids between the HaPV and SV40 DNAs could be demonstrated only under nonstringent conditions. The region of highest homology was mapped in the early region of the SV40 genome. Extensive homology was detected between the genomes of HaPV and Py under stringent hybridization conditions, indicating at least 80% base matching in the regions of strongest sequence homology. These sequences were localized within both the early region and the late region of the Py genome. The homologous DNA segments mapped in the Py and the SV40 genomes are among the most strongly conserved regions in the polyoma (miopapova)-virus group.
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