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Dotan M, Blau H, Singer A, Stafler P, Prais D, Cohen-Cymberknoh M, Reiter J, Efrati O, Dagan A, Bentur L, Gur M, Livnat G, Yaacoby-Bianu K, Aviram M, Golan Tripto I, Bar-On O, Matar R, Hagit S, Malcov M, Altarescu G, Segev H, Feldman B, Kerem E, Mei-Zahav M. The new face of cystic fibrosis in the era of population genetic carrier screening. J Cyst Fibros 2023:S1569-1993(23)01674-0. [PMID: 37980178 DOI: 10.1016/j.jcf.2023.11.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Revised: 11/02/2023] [Accepted: 11/06/2023] [Indexed: 11/20/2023]
Abstract
BACKGROUND Population genetic carrier screening (PGCS) for cystic fibrosis (CF) has been offered to couples in Israel since 1999 and was included in a fully subsidized national program in 2008. We evaluated the impact of PGCS on CF incidence, genetic and clinical features. METHODS This was a retrospective national study. Demographic and clinical characteristics of children with CF born in Israel between 2008 and 2018 were obtained from the national CF registry and from patients' medical records. Data on CF births, preimplantation genetic testing (PGT), pregnancy termination and de-identified data from the PGCS program were collected. RESULTS CF births per 100,000 live births decreased from 8.29 in 2008 to 0.54 in 2018 (IRR = 0.84, p < 0.001). The CF pregnancy termination rate did not change (IRR = 1, p= 0.9) while the CF-related PGT rate increased markedly (IRR = 1.33, p < 0.001). One hundred and two children were born with CF between 2008 and 2018 with a median age at diagnosis of 4.8 months, range 0-111 months. Unlike the generally high uptake nationally, 65/102 had not performed PGCS. Even if all had utilized PGCS, only 51 would have been detected by the existing genetic screening panel. Clinically, 34 % of children were pancreatic sufficient compared to 23 % before 2008 (p = 0.04). CONCLUSIONS Since institution of a nationwide PGCS program, the birth of children with CF decreased markedly. Residual function variants and pancreatic sufficiency were more common. A broader genetic screening panel and increased PGCS utilization may further decrease the birth of children with CF.
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Affiliation(s)
- Miri Dotan
- Kathy and Lee Graub Cystic Fibrosis Center, Schneider Children's Medical Center of Israel, Petach Tikva, Israel; Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Hannah Blau
- Kathy and Lee Graub Cystic Fibrosis Center, Schneider Children's Medical Center of Israel, Petach Tikva, Israel; Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Amihood Singer
- Public Health Services, Ministry of Health, Jerusalem, Israel
| | - Patrick Stafler
- Kathy and Lee Graub Cystic Fibrosis Center, Schneider Children's Medical Center of Israel, Petach Tikva, Israel; Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Dario Prais
- Kathy and Lee Graub Cystic Fibrosis Center, Schneider Children's Medical Center of Israel, Petach Tikva, Israel; Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Malena Cohen-Cymberknoh
- Pediatric Pulmonary Unit and Cystic fibrosis Center, Hadassah Medical Center and Faculty of Medicine, Hebrew University of Jerusalem, Israel
| | - Joel Reiter
- Pediatric Pulmonary Unit and Cystic fibrosis Center, Hadassah Medical Center and Faculty of Medicine, Hebrew University of Jerusalem, Israel
| | - Ori Efrati
- Safra Children's Hospital, Sheba Medical Center, Ramat Gan, Israel
| | - Adi Dagan
- Safra Children's Hospital, Sheba Medical Center, Ramat Gan, Israel
| | - Lea Bentur
- Pediatric Pulmonary Institute and CF Center, Rambam Health Care Campus, Rappaport Children's Hospital, Haifa, Israel; Ruth and Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
| | - Michal Gur
- Pediatric Pulmonary Institute and CF Center, Rambam Health Care Campus, Rappaport Children's Hospital, Haifa, Israel; Ruth and Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
| | - Galit Livnat
- Ruth and Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel; Pediatric Pulmonology Unit and CF center, Carmel Medical Center, Haifa, Israel
| | - Karin Yaacoby-Bianu
- Ruth and Bruce Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel; Pediatric Pulmonology Unit and CF center, Carmel Medical Center, Haifa, Israel
| | - Micha Aviram
- Soroka University Medical Center, Pediatric Pulmonary Unit, Ben Gurion University, Beer Sheva, Israel
| | - Inbal Golan Tripto
- Soroka University Medical Center, Pediatric Pulmonary Unit, Ben Gurion University, Beer Sheva, Israel
| | - Ophir Bar-On
- Kathy and Lee Graub Cystic Fibrosis Center, Schneider Children's Medical Center of Israel, Petach Tikva, Israel; Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Reut Matar
- Raphael Recanati Genetic Institute, Rabin Medical Center, Petach Tikva, Israel
| | - Shani Hagit
- Danek Gertner Institute of Human Genetics, Sheba Medical Center, Ramat-Gan, Israel
| | - Mira Malcov
- Wolfe PGD-Stem Cell Laboratory, Racine IVF Unit, Lis Maternity Hospital, Tel-Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Gheona Altarescu
- Medical Genetics Institute, Shaare Zedek Medical Center, Jerusalem, Israel
| | - Hanna Segev
- Medical Genetics Institute, Rambam Health Care Campus, Haifa, Israel
| | - Baruch Feldman
- PGD Program and Laboratory, Assuta Medical Center, Tel Aviv, Israel
| | - Eitan Kerem
- Pediatric Pulmonary Unit and Cystic fibrosis Center, Hadassah Medical Center and Faculty of Medicine, Hebrew University of Jerusalem, Israel
| | - Meir Mei-Zahav
- Kathy and Lee Graub Cystic Fibrosis Center, Schneider Children's Medical Center of Israel, Petach Tikva, Israel; Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
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2
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Lang E, Kiernan B, Muise ED, Giusti R. Meconium ileus and pancreatic sufficiency with D1152H mutation: A case report and review of the literature. J Cyst Fibros 2023; 22:1125-1127. [PMID: 37423798 DOI: 10.1016/j.jcf.2023.02.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Revised: 12/19/2022] [Accepted: 02/04/2023] [Indexed: 07/11/2023]
Abstract
Meconium ileus (MI) is one presenting manifestation of Cystic Fibrosis (CF), classically associated with class I-III CF transmembrane conductance regulator (CFTR) mutations and pancreatic insufficiency (PI). D1152H is a class IV mutation that corresponds with a milder CF phenotype and pancreatic sufficiency (PS). We present the case of an infant with G542X/D1152H mutations and MI who required surgical intervention with small bowel resection. The sweat testing was normal, and this child presently remains PS, however at age 5 continues to experience short gut syndrome and failure to thrive. Eight cases were identified in the CF Registry and seven cases in the literature describing patients with D1152H and echogenic bowel (EB) or MI. Our case highlights the importance of CFTR gene sequencing in infants with EB or MI and sweat testing not suggestive of CF. It is our practice to perform full CFTR gene sequencing for infants who present with MI, recognizing protocols for newborn screening across the United States vary. Increased awareness of D1152H association with PS may also well inform both prenatal and postnatal genetic counseling.
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Affiliation(s)
- Emma Lang
- Division of Pediatric Pulmonary Medicine, Hassenfeld Children's Hospital, NYU Langone Health, 4th Floor, New York, NY 10016, United States
| | - Bridget Kiernan
- Division of Pediatric Gastroenterology, Hassenfeld Children's Hospital, NYU Langone Health, New York, NY, United States
| | - Eleanor D Muise
- Division of Pediatric Pulmonary Medicine, Hassenfeld Children's Hospital, NYU Langone Health, 4th Floor, New York, NY 10016, United States
| | - Robert Giusti
- Division of Pediatric Pulmonary Medicine, Hassenfeld Children's Hospital, NYU Langone Health, 4th Floor, New York, NY 10016, United States.
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3
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Manzoor J, Hughes DA. Cystic Fibrosis screen positive, inconclusive diagnosis (CFSPID) to Cystic Fibrosis: Detecting disease with serial assessments. Paediatr Respir Rev 2023; 47:19-22. [PMID: 37365112 DOI: 10.1016/j.prrv.2023.06.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Accepted: 06/14/2023] [Indexed: 06/28/2023]
Abstract
We present the case of a child given a CFSPID designation in early life who was later reclassified as having CF based on a combination of recurrent respiratory symptoms and CFTR functional testing, despite normal sweat chloride levels. Here we demonstrate the importance of monitoring these children, each time reviewing the diagnosis based on updated understanding of individual CFTR mutation phenotypes or clinical findings inconsistent with the designation. This case identifies situations in which the CFSPID designation should be challenged, and gives an approach for this when CF is suspected.
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Affiliation(s)
- J Manzoor
- Department of Paediatric Respiratory Medicine, King's College Hospital, Denmark Hill, London SE5 9RS, United Kingdom
| | - D A Hughes
- Department of Paediatric Respiratory Medicine, King's College Hospital, Denmark Hill, London SE5 9RS, United Kingdom.
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4
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Barry PJ, Simmonds NJ. Diagnosing Cystic Fibrosis in Adults. Semin Respir Crit Care Med 2023; 44:242-251. [PMID: 36623819 DOI: 10.1055/s-0042-1759881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Diagnosing cystic fibrosis (CF) in adulthood is not a rare occurrence for CF centers despite the popular belief that the diagnosis is achieved almost universally in childhood by means of newborn screening or early clinical presentation. The purpose of this review article is to highlight specific considerations of adult diagnosis of CF. Obtaining a diagnosis of CF at any age is exceptionally important to ensure optimal treatment, monitoring, and support. In the new era of more personalized treatment with the advent of transformative therapies targeting the underlying protein defect, accurate diagnosis is of increasing importance. This review highlights the diagnostic algorithm leading to a new diagnosis of CF in adults. The diagnosis is usually confirmed in the presence of a compatible clinical presentation, evidence of cystic fibrosis transmembrane conductance regulator (CFTR) protein dysfunction, and/or identification of variants in the CFTR gene believed to alter protein function. Achieving the diagnosis, however, is not always straightforward as CFTR protein function exists on a continuum with different organs displaying varying sensitivity to diminution in function. We highlight the current knowledge regarding the epidemiology of CF diagnosed in adults and outline the various clinical presentations, including pulmonary and extrapulmonary, which are more common in this population. We expand on the stepwise testing procedures that lead to diagnosis, paying particular attention to additional levels of testing which may be required to achieve an accurate diagnosis. There continues to be an important need for both pulmonary and other specialists to be aware of the potential for later presentation of CF, as the improvements in treatment over decades have had large positive impacts on prognosis for people with this condition.
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Affiliation(s)
- Peter J Barry
- Manchester Adult Cystic Fibrosis Centre, Manchester University National Health Service Foundation Trust, Wythenshawe Hospital, Manchester, United Kingdom
| | - Nicholas J Simmonds
- Adult Cystic Fibrosis Centre, Royal Brompton Hospital, London, United Kingdom.,National Heart and Lung Institute, Imperial College London, London, United Kingdom
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Abstract
Rationale: Ivacaftor’s clinical effects in the residual function mutations 3849 + 10kb C→T and D1152H warrant further characterization. Objectives: To evaluate ivacaftor’s effect in people with cystic fibrosis aged ≥6 years with 3849 + 10kb C→T or D1152H residual function mutations and to explore the correlation between ivacaftor-induced organoid-based cystic fibrosis transmembrane conductance regulator function measurements and clinical response to ivacaftor. Methods: Participants were randomized (1:1) in this placebo-controlled crossover study; each treatment sequence included two 8-week treatments with an 8-week washout period. The primary endpoint was absolute change in lung clearance index2.5 from baseline through Week 8. Additional endpoints included lung function, patient-reported outcomes, and in vitro intestinal organoid–based measurements of ivacaftor-induced cystic fibrosis transmembrane conductance regulator function. Results: Of 38 participants, 37 completed the study. The primary endpoint was met; the Bayesian posterior probability of improvement in lung clearance index2.5 with ivacaftor versus placebo was >99%. Additional endpoints improved with ivacaftor. Safety findings were consistent with ivacaftor’s known safety profile. Dose-dependent swelling was observed in 23 of 25 viable organoid cultures with ivacaftor treatment. Correlations between ivacaftor-induced organoid swelling and clinical endpoints were negligible to low. Conclusions: In people with cystic fibrosis aged ≥6 years with a 3849 + 10kb C→T or D1152H mutation, ivacaftor treatment improved clinical endpoints compared with placebo; however, there was no correlation between organoid swelling and change in clinical endpoints. The organoid assay may assist in identification of ivacaftor-responsive mutations but in this study did not predict magnitude of clinical benefit for individual people with cystic fibrosis with these two mutations. Clinical trial registered with ClinicalTrials.gov (NCT03068312).
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6
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The CFTR Mutation c.3453G > C (D1152H) Confers an Anion Selectivity Defect in Primary Airway Tissue that Can Be Rescued by Ivacaftor. J Pers Med 2020; 10:jpm10020040. [PMID: 32414100 PMCID: PMC7354675 DOI: 10.3390/jpm10020040] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 04/29/2020] [Accepted: 05/08/2020] [Indexed: 02/07/2023] Open
Abstract
The Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) gene variant, c.3453G > C (D1152H), is associated with mild Cystic Fibrosis (CF) disease, though there is considerable clinical variability ranging from no detectable symptoms to lung disease with early acquisition of Pseudomonas aeruginosa. The approval extension of ivacaftor, the first CFTR modulator drug approved, to include D1152H was based on a positive drug response of defective CFTR-D1152H chloride channel function when expressed in FRT cells. Functional analyses of primary human nasal epithelial cells (HNE) from an individual homozygous for D1152H now revealed that while CFTR-D1152H demonstrated normal, wild-type level chloride conductance, its bicarbonate-selective conductance was impaired. Treatment with ivacaftor increased this bicarbonate-selective conductance. Extensive genetic, protein and functional analysis of the nasal cells of this D1152H/D1152H patient revealed a 90% reduction of CFTR transcripts due to the homozygous presence of the 5T polymorphism in the poly-T tract forming a complex allele with D1152H. Thus, we confirm previous observation in patient-derived tissue that 10% normal CFTR transcripts confer normal, wild-type level chloride channel activity. Together, this study highlights the benefit of patient-derived tissues to study the functional expression and pharmacological modulation of CF-causing mutations, in order to understand pathogenesis and therapeutic responses.
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7
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Boussaroque A, Audrézet MP, Raynal C, Sermet-Gaudelus I, Bienvenu T, Férec C, Bergougnoux A, Lopez M, Scotet V, Munck A, Girodon E. Penetrance is a critical parameter for assessing the disease liability of CFTR variants. J Cyst Fibros 2020; 19:949-954. [PMID: 32327388 DOI: 10.1016/j.jcf.2020.03.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Revised: 03/23/2020] [Accepted: 03/26/2020] [Indexed: 12/19/2022]
Abstract
BACKGROUND Major issues of newborn screening (NBS) for CF are the assessment of disease liability of variants and of the penetrance of clinical CF, notably in inconclusive diagnosis. The penetrance of CF is defined as the risk of a particular genotype to lead to a CF phenotype. METHODS We aimed to get insight into the penetrance of CF for fifteen CFTR variants: 5 frequent CF-causing and 10 classified as of varying clinical consequence (VCC) or associated with a CFTR-related disorder (CFTR-RD) in CFTR2 or CFTR-France databases. The penetrance was approached by: (1) comparison of variant allelic frequencies in CF patients (CFTR2) and in the general population; (2) estimation of the likelihood of a positive NBS test for the 14 compound heterozygous with F508del and the F508del homozygous genotypes, defined as the ratio of detected/expected number of neonates with a given genotype in the 2002-2017 period. RESULTS A full penetrance was observed for severe CF-causing variants. Five variants were more frequently found in the general population than in CF patients: TG11T5, TG12T5, TG13T5, L997F and R117H;T7. The likelihood of a positive NBS test was 0.03% for TG11T5, 0.3% for TG12T5, 1.9% for TG13T5, 0.6% for L997F, 11.7% for D1152H, and 17.8% for R117H;T7. Penetrance varied greatly for variants with discrepant classification between CFTR2 and CFTR-France: 5.1% for R117C, 12.3% for T338I, 43.5% for D110H and 52.6% for L206W. CONCLUSION These results illustrate the contribution of genetics population data to assess the disease liability of variants for diagnosis and genetic counselling purposes.
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Affiliation(s)
- A Boussaroque
- APHP.Centre-Université de Paris, Cochin Hospital, Molecular Genetics Laboratory, Paris, France
| | - M-P Audrézet
- Molecular Genetics Laboratory - CHRU Brest, Brest, France; Inserm UMR 1078, GGB, F-29200 Brest, France
| | - C Raynal
- Molecular Genetics Laboratory - CHU Montpellier, EA7402 Université de Montpellier, Montpellier, France
| | - I Sermet-Gaudelus
- APHP.Centre Université de Paris, Necker Enfants Malades Hospital, Cystic Fibrosis Center, Paris, France and INSERM U 1151, Paris, France
| | - T Bienvenu
- APHP.Centre-Université de Paris, Cochin Hospital, Molecular Genetics Laboratory, Paris, France
| | - C Férec
- Molecular Genetics Laboratory - CHRU Brest, Brest, France; Inserm UMR 1078, GGB, F-29200 Brest, France
| | - A Bergougnoux
- Molecular Genetics Laboratory - CHU Montpellier, EA7402 Université de Montpellier, Montpellier, France
| | - M Lopez
- APHP.Centre-Université de Paris, Cochin Hospital, Molecular Genetics Laboratory, Paris, France
| | - V Scotet
- Inserm UMR 1078, GGB, F-29200 Brest, France
| | - A Munck
- APHP.Centre Université de Paris, Necker Enfants Malades Hospital, Cystic Fibrosis Center, Paris, France and INSERM U 1151, Paris, France; Société francaise de dépistage néonatal
| | - E Girodon
- APHP.Centre-Université de Paris, Cochin Hospital, Molecular Genetics Laboratory, Paris, France.
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8
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Image-based β-adrenergic sweat rate assay captures minimal cystic fibrosis transmembrane conductance regulator function. Pediatr Res 2020; 87:137-145. [PMID: 31344706 PMCID: PMC6962560 DOI: 10.1038/s41390-019-0503-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/23/2018] [Revised: 06/14/2019] [Accepted: 07/10/2019] [Indexed: 12/15/2022]
Abstract
BACKGROUND There is a need to prognosticate the severity of cystic fibrosis (CF) detected by newborn screening (NBS) by early assessment of CF transmembrane conductance regulator (CFTR) protein function. We introduce novel instrumentation and protocol for evaluating CFTR activity as reflected by β-adrenergically stimulated sweat secretion. METHODS A pixilated image sensor detects sweat rates. Compounds necessary for maximum sweat gland stimulation are applied by iontophoresis, replacing ID injections. Results are compared to a validated β-adrenergic assay that measures sweat secretion by evaporation (evaporimetry). RESULTS Ten healthy controls (HC), 6 heterozygous (carriers), 5 with CFTR-related metabolic syndrome (CRMS)/CF screen-positive, inconclusive diagnosis (CFSPID), and 12 CF individuals completed testing. All individuals with minimal and residual function CFTR mutations had low ratios of β-adrenergically stimulated sweat rate to cholinergically stimulated sweat rate (β/chol) as measured by either assay. CONCLUSIONS β-Adrenergic assays quantitate CFTR dysfunction in the secretory pathway of sweat glands in CF and CRMS/CFSPID populations. This novel image-sensor and iontophoresis protocol detect CFTR function with minimal and residual function and is a feasible test for young children because it is insensible to movement and it decreases the number of injections. It may also assist to distinguish between CF and CRMS/CFSPID diagnosis.
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9
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The implications and management of cystic fibrosis screen positive, inconclusive diagnosis patients. Paediatr Respir Rev 2019; 31:21-24. [PMID: 31153793 DOI: 10.1016/j.prrv.2019.02.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Accepted: 02/27/2019] [Indexed: 11/22/2022]
Abstract
Newborn screening and extensive genetic analysis has led to the recognition of a cohort of infants with an equivocal diagnosis of Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) disease. This paper reviews the comprehensive approach required for diagnosis of Cystic Fibrosis Screen Positive, Inconclusive Diagnosis (CFSPID) and uses an illustrative case with p.Asp1152His (D1152H) mutation to examine the varying clinical phenotype seen amongst CFSPID patients. Whilst infants are well at diagnosis, uncertainties about cystic fibrosis (CF) disease progression indicate the importance of monitoring and early specialist involvement. However, over-medicalisation can cause significant psychosocial impact on patients' and families. The complexities underlying the surveillance and long-term management of patients with CFSPID are explored.
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10
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Rosa KMD, Lima EDSD, Machado CC, Rispoli T, Silveira VD, Ongaratto R, Comaru T, Pinto LA. Genetic and phenotypic traits of children and adolescents with cystic fibrosis in Southern Brazil. ACTA ACUST UNITED AC 2019; 44:498-504. [PMID: 30726326 PMCID: PMC6459751 DOI: 10.1590/s1806-37562017000000418] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2017] [Accepted: 08/12/2017] [Indexed: 11/22/2022]
Abstract
Objectives: To characterize the main identified mutations on cystic fibrosis transmembrane conductance regulator (CFTR) in a group of children and adolescents at a cystic fibrosis center and its association with the clinical and laboratorial characteristics. Method: Descriptive cross-sectional study including patients with cystic fibrosis who had two alleles identified with CFTR mutation. Clinical, anthropometrical, laboratorial and pulmonary function (spirometry) data were collected from patients’ records in charts and described with the results of the sample genotyping. Results: 42 patients with cystic fibrosis were included in the study. The most frequent mutation was F508del, covering 60 alleles (71.4%). The second most common mutation was G542X (six alleles, 7.1%), followed by N1303K and R1162X mutations (both with four alleles each). Three patients (7.14%) presented type III and IV mutations, and 22 patients (52.38%) presented homozygous mutation for F508del. Thirty three patients (78.6%) suffered of pancreatic insufficiency, 26.2% presented meconium ileus, and 16.7%, nutritional deficit. Of the patients in the study, 59.52% would be potential candidates for the use of CFTR-modulating drugs. Conclusions: The mutations of CFTR identified more frequently were F508del and G542X. These are type II and I mutations, respectively. Along with type III, they present a more severe cystic fibrosis phenotype. More than half of the sample (52.38%) presented homozygous mutation for F508del, that is, patients who could be treated with Lumacaftor/Ivacaftor. Approximately 7% of the patients (7.14%) presented type III and IV mutations, therefore becoming candidates for the treatment with Ivacaftor.
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Affiliation(s)
- Katiana Murieli da Rosa
- . Pediatric Residency Program, Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre (RS) Brazil
| | - Eliandra da Silveira de Lima
- . Post-Graduate Degree in Pediatrics and Children's Health, Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre (RS) Brazil
| | - Camila Correia Machado
- . Medical School , Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre (RS) Brazil
| | - Thaiane Rispoli
- . Post-Graduate Degree in Cell and Molecular Biology, Universidade Federal do Rio Grande do Sul, Porto Alegre (RS) Brazil
| | | | - Renata Ongaratto
- . Post-Graduate Degree in Pediatrics and Children's Health, Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre (RS) Brazil
| | - Talitha Comaru
- . Post-Graduate Degree in Pediatrics and Children's Health, Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre (RS) Brazil
| | - Leonardo Araújo Pinto
- . Centro Infantil, Instituto de Pesquisas Biomédicas, Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre (RS) Brazil
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11
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Marteyn BS, Burgel PR, Meijer L, Witko-Sarsat V. Harnessing Neutrophil Survival Mechanisms during Chronic Infection by Pseudomonas aeruginosa: Novel Therapeutic Targets to Dampen Inflammation in Cystic Fibrosis. Front Cell Infect Microbiol 2017; 7:243. [PMID: 28713772 PMCID: PMC5492487 DOI: 10.3389/fcimb.2017.00243] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Accepted: 05/26/2017] [Indexed: 01/08/2023] Open
Abstract
More than two decades after cloning the cystic fibrosis transmembrane regulator (CFTR) gene, the defective gene in cystic fibrosis (CF), we still do not understand how dysfunction of this ion channel causes lung disease and the tremendous neutrophil burden which persists within the airways; nor why chronic colonization by Pseudomonas aeruginosa develops in CF patients who are thought to be immunocompetent. It appears that the microenvironment within the lung of CF patients provides favorable conditions for both P. aeruginosa colonization and neutrophil survival. In this context, the ability of bacteria to induce hypoxia, which in turn affects neutrophil survival is an additional level of complexity that needs to be accounted for when controlling neutrophil fate in CF. Recent studies have underscored the importance of neutrophils in innate immunity and their functions appear to extend far beyond their well-described role in antibacterial defense. Perhaps a disturbance in neutrophil reprogramming during the course of an infection severely modulates the inflammatory response in CF. Furthermore there is an emerging concept that the CFTR itself may be an immune modulator and stimulating CFTR function in CF patients could promote neutrophil and macrophages antimicrobial function. Fostering the resolution of inflammation by favoring neutrophil apoptosis could preserve their microbicidal activities but decrease their proinflammatory potential. In this context, triggering neutrophil apoptosis with roscovitine may be a potential therapeutic option and this is currently being evaluated in CF patients. In the present review we discuss how neutrophils functions are disturbed in CF and how this may relate to chronic infection with P. aeuginosa and we propose novel research directions aimed at modulating neutrophil survival, dampening lung inflammation and ultimately leading to an amelioration of the lung disease.
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Affiliation(s)
- Benoît S Marteyn
- Unité de Pathogénie Microbienne Moléculaire, Institut PasteurParis, France.,Institut National de la Santé et de la Recherche Médicale, U12021202Paris, France.,Institut Gustave RoussyVillejuif, France
| | - Pierre-Régis Burgel
- Université Paris Descartes, Sorbonne Paris CitéParis, France.,Pneumology Department, Hôpital CochinParis, France
| | | | - Véronique Witko-Sarsat
- Institut National de la Santé et de la Recherche Médicale, U1016, Institut CochinParis, France.,Centre National de la Recherche Scientifique-UMR 8104Paris, France.,Center of Excellence, Labex InflamexParis, France
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12
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Sosnay PR, Salinas DB, White TB, Ren CL, Farrell PM, Raraigh KS, Girodon E, Castellani C. Applying Cystic Fibrosis Transmembrane Conductance Regulator Genetics and CFTR2 Data to Facilitate Diagnoses. J Pediatr 2017; 181S:S27-S32.e1. [PMID: 28129809 DOI: 10.1016/j.jpeds.2016.09.063] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
OBJECTIVE As a Mendelian disease, genetics plays an integral role in the diagnosis of cystic fibrosis (CF). The identification of 2 disease-causing mutations in the CF transmembrane conductance regulator (CFTR) in an individual with a phenotype provides evidence that the disease is CF. However, not all variations in CFTR always result in CF. Therefore, for CFTR genotype to provide the same level of evidence of CFTR dysfunction as shown by direct tests such as sweat chloride or nasal potential difference, the mutations identified must be known to always result in CF. The use of CFTR genetics in CF diagnosis, therefore, relies heavily on mutation interpretation. STUDY DESIGN Progress that has been made on mutation interpretation and annotation was reviewed at the recent CF Foundation Diagnosis Consensus Conference. A modified Delphi method was used to identify consensus statements on the use of genetic analysis in CF diagnosis. RESULTS The largest recent advance in CF genetics has come through the Clinical and Functional Translation of CFTR (CFTR2) project. This undertaking seeks to characterize CFTR mutations from patients with CF around the world. The project also established guidelines for the clinical, functional, and population/penetrance criteria that can be used to interpret mutations not yet included in CFTR2's review. CONCLUSIONS The use of CFTR genetics to aid in diagnosis of CF requires that the mutations identified have a known disease liability. The demonstration of 2 in trans mutations known to always result in CF is satisfactory evidence of CFTR dysfunction. However, if the identified mutations are known to be associated with variable outcomes, or have unknown consequence, that genotype may not result in a CF phenotype. In these cases, other tests of CFTR function may help.
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Affiliation(s)
- Patrick R Sosnay
- Department of Medicine, Division of Pulmonary and Critical Care Medicine and McKusick-Nathans Institute of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Danieli B Salinas
- Department of Pediatrics, Division of Pediatric Pulmonology, Children's Hospital Los Angeles, Keck School of Medicine, University of Southern California, Los Angeles, CA
| | | | - Clement L Ren
- Section of Pediatric Pulmonology, Allergy, and Sleep Medicine, Indiana University School of Medicine, Indianapolis, IN
| | - Philip M Farrell
- Departments of Pediatrics and Population Health Sciences, University of Wisconsin School of Medicine and Public Health, Madison, WI
| | - Karen S Raraigh
- McKusick-Nathans Institute of Medical Genetics, Johns Hopkins University School of Medicine, Johns Hopkins University, Baltimore, MD
| | - Emmanuelle Girodon
- Service de Génétique et Biologie Moléculaires, Groupe Hospitalier Cochin - Broca - Hôtel Dieu, Paris, France
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Salinas DB, Sosnay PR, Azen C, Young S, Raraigh KS, Keens TG, Kharrazi M. Benign and Deleterious Cystic Fibrosis Transmembrane Conductance Regulator Mutations Identified by Sequencing in Positive Cystic Fibrosis Newborn Screen Children from California. PLoS One 2016; 11:e0155624. [PMID: 27214204 PMCID: PMC4877015 DOI: 10.1371/journal.pone.0155624] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Accepted: 05/02/2016] [Indexed: 12/19/2022] Open
Abstract
Background Of the 2007 Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) mutations, 202 have been assigned disease liability. California’s racially diverse population, along with CFTR sequencing as part of newborn screening model, provides the opportunity to examine the phenotypes of children with uncategorized mutations to help inform disease liability and penetrance. Methods We conducted a retrospective cohort study based on children screened from 2007 to 2011 and followed for two to six years. Newborns that screened positive were divided into three genotype groups: those with two CF-causing mutations (CF-C); those with one mutation of varying clinic consequence (VCC); and those with one mutation of unknown disease liability (Unknown). Sweat chloride tests, pancreatic sufficiency status, and Pseudomonas aeruginosa colonization were compared. Results Children with two CF-causing mutations had a classical CF phenotype, while 5% of VCC (4/78) and 11% of Unknown (27/244) met diagnostic criteria of CF. Children carrying Unknown mutations 2215insG with D836Y, and T1036N had early and classical CF phenotype, while others carrying 1525-42G>A, L320V, L967S, R170H, and 296+28A>G had a benign clinical presentation, suggesting that these are non-CF causing. Conclusions While most infants with VCC and Unknown CFTR mutations do not meet diagnostic criteria for CF, a small proportion do. These findings highlight the range of genotypes and phenotypes in the first few years of life following CF newborn screening when CFTR sequencing is performed.
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Affiliation(s)
- Danieli B. Salinas
- Department of Pediatrics, Division of Pediatric Pulmonology, Children’s Hospital Los Angeles, Keck School of Medicine, University of Southern California, Los Angeles, California, United States of America
- * E-mail:
| | - Patrick R. Sosnay
- Department of Medicine, Division of Pulmonary and Critical Care Medicine and McKusick-Nathans Institute of Medical Genetics, Johns Hopkins University School of Medicine, Johns Hopkins University, Baltimore, Maryland, United States of America
| | - Colleen Azen
- Department of Biostatistics, Southern California Clinical and Translational Science Institute, Children’s Hospital Los Angeles, Keck School of Medicine, University of Southern California, Los Angeles, California, United States of America
| | - Suzanne Young
- The Sequoia Foundation, La Jolla, California, United States of America
| | - Karen S. Raraigh
- McKusick-Nathans Institute of Medical Genetics, Johns Hopkins University School of Medicine, Johns Hopkins University, Baltimore, Maryland, United States of America
| | - Thomas G. Keens
- Department of Pediatrics, Division of Pediatric Pulmonology, Children’s Hospital Los Angeles, Keck School of Medicine, University of Southern California, Los Angeles, California, United States of America
| | - Martin Kharrazi
- Division of Environmental and Occupational Disease Control, Environmental Health Investigations Branch, Environmental Epidemiology Section, California Department of Public Health, Richmond, California, United States of America
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Hughes EE, Stevens CF, Saavedra-Matiz CA, Tavakoli NP, Krein LM, Parker A, Zhang Z, Maloney B, Vogel B, DeCelie-Germana J, Kier C, Anbar RD, Berdella MN, Comber PG, Dozor AJ, Goetz DM, Guida L, Kattan M, Ting A, Voter KZ, van Roey P, Caggana M, Kay DM. Clinical Sensitivity of Cystic Fibrosis Mutation Panels in a Diverse Population. Hum Mutat 2015; 37:201-8. [PMID: 26538069 DOI: 10.1002/humu.22927] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2015] [Accepted: 10/20/2015] [Indexed: 12/11/2022]
Abstract
Infants are screened for cystic fibrosis (CF) in New York State (NYS) using an IRT-DNA algorithm. The purpose of this study was to validate and assess clinical validity of the US FDA-cleared Illumina MiSeqDx CF 139-Variant Assay (139-VA) in the diverse NYS CF population. The study included 439 infants with CF identified via newborn screening (NBS) from 2002 to 2012. All had been screened using the Abbott Molecular CF Genotyping Assay or the Hologic InPlex CF Molecular Test. All with CF and zero or one mutation were tested using the 139-VA. DNA extracted from dried blood spots was reliably and accurately genotyped using the 139-VA. Sixty-three additional mutations were identified. Clinical sensitivity of three panels ranged from 76.2% (23 mutations recommended for screening by ACMG/ACOG) to 79.7% (current NYS 39-mutation InPlex panel), up to 86.0% for the 139-VA. For all, sensitivity was highest in Whites and lowest in the Black population. Although the sample size was small, there was a nearly 20% increase in sensitivity for the Black CF population using the 139-VA (68.2%) over the ACMG/ACOG and InPlex panels (both 50.0%). Overall, the 139-VA is more sensitive than other commercially available panels, and could be considered for NBS, clinical, or research laboratories conducting CF screening.
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Affiliation(s)
- Erin E Hughes
- Division of Genetics, Wadsworth Center, New York State Department of Health, Albany, New York
| | - Colleen F Stevens
- Division of Genetics, Wadsworth Center, New York State Department of Health, Albany, New York
| | - Carlos A Saavedra-Matiz
- Division of Genetics, Wadsworth Center, New York State Department of Health, Albany, New York
| | - Norma P Tavakoli
- Division of Genetics, Wadsworth Center, New York State Department of Health, Albany, New York.,Department of Biomedical Sciences, School of Public Health, State University of New York, Albany, New York
| | - Lea M Krein
- Division of Genetics, Wadsworth Center, New York State Department of Health, Albany, New York
| | - April Parker
- Division of Genetics, Wadsworth Center, New York State Department of Health, Albany, New York
| | - Zhen Zhang
- Applied Genomics Technologies Core, Wadsworth Center, New York State Department of Health, Albany, New York
| | - Breanne Maloney
- Division of Genetics, Wadsworth Center, New York State Department of Health, Albany, New York
| | - Beth Vogel
- Division of Genetics, Wadsworth Center, New York State Department of Health, Albany, New York
| | | | - Catherine Kier
- University Medical Center at Stony Brook, Stony Brook, New York
| | - Ran D Anbar
- SUNY Upstate Medical University/Golisano Children's Hospital, Syracuse, New York
| | - Maria N Berdella
- The Cystic Fibrosis Center, Mount Sinai Beth Israel, New York, New York
| | | | - Allen J Dozor
- Maria Fareri Children's Hospital at Westchester Medical Center and New York Medical College, Valhalla, New York
| | | | - Louis Guida
- Good Samaritan Hospital, North Babylon, New York
| | - Meyer Kattan
- Columbia University Medical Center, New York, New York
| | - Andrew Ting
- Mount Sinai School of Medicine, New York, New York
| | - Karen Z Voter
- Strong Memorial Hospital, University of Rochester Medical Center, Rochester, New York
| | | | - Patrick van Roey
- Division of Genetics, Wadsworth Center, New York State Department of Health, Albany, New York.,Applied Genomics Technologies Core, Wadsworth Center, New York State Department of Health, Albany, New York
| | - Michele Caggana
- Division of Genetics, Wadsworth Center, New York State Department of Health, Albany, New York
| | - Denise M Kay
- Division of Genetics, Wadsworth Center, New York State Department of Health, Albany, New York
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Terlizzi V, Carnovale V, Castaldo G, Castellani C, Cirilli N, Colombo C, Corti F, Cresta F, D'Adda A, Lucarelli M, Lucidi V, Macchiaroli A, Madarena E, Padoan R, Quattrucci S, Salvatore D, Zarrilli F, Raia V. Clinical expression of patients with the D1152H CFTR mutation. J Cyst Fibros 2015; 14:447-52. [PMID: 25583415 DOI: 10.1016/j.jcf.2014.12.012] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2014] [Revised: 12/17/2014] [Accepted: 12/18/2014] [Indexed: 01/30/2023]
Abstract
BACKGROUND Discordant results were reported on the clinical expression of subjects bearing the D1152H CFTR mutation, and also for the small number of cases reported so far. METHODS A retrospective review of clinical, genetic and biochemical data was performed from individuals homozygous or compound heterozygous for the D1152H mutation followed in 12 Italian cystic fibrosis (CF) centers. RESULTS 89 subjects carrying at least D1152H on one allele were identified. 7 homozygous patients had very mild clinical expression. Over half of the 74 subjects compound heterozygous for D1152H and a I-II-III class mutation had borderline or pathological sweat test and respiratory or gastrointestinal symptoms; one third had pulmonary bacteria colonization and 10/74 cases had complications (i.e. diabetes, allergic bronchopulmonary aspergillosis, and hemoptysis). However, their clinical expression was less severe as compared to a group of CF patients homozygous for the F508del mutation. Finally, 8 subjects compound heterozygous for D1152H and a IV-V class mutation showed very mild disease. CONCLUSIONS The natural history of subjects bearing the D1152H mutation is widely heterogeneous and is influenced by the mutation in trans.
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Affiliation(s)
- Vito Terlizzi
- Dipartimento di Scienze Mediche Traslazionali, Sezione di Pediatria, Università di Napoli Federico II, Naples, Italy
| | - Vincenzo Carnovale
- Centro Fibrosi Cistica Adulti, Dipartimento di Scienze Traslazionali, Università di Napoli Federico II, Naples, Italy
| | - Giuseppe Castaldo
- CEINGE-Biotecnologie avanzate, Naples, Italy; Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università di Napoli Federico II, Naples, Italy
| | - Carlo Castellani
- Centro Fibrosi Cistica, Azienda Ospedaliera Universitaria Integrata, Verona, Italy
| | - Natalia Cirilli
- Centro Regionale Fibrosi Cistica, Dipartimento Materno-Infantile, Ospedali Riuniti Ancona, Ancona, Italy
| | - Carla Colombo
- Centro Fibrosi Cistica, Fondazione IRCCS Ca' Granda, Ospedale Maggiore Policlinico, Milano, Italy
| | - Fabiola Corti
- Centro Fibrosi Cistica, Fondazione IRCCS Ca' Granda, Ospedale Maggiore Policlinico, Milano, Italy
| | - Federico Cresta
- Centro Fibrosi Cistica, Dipartimento di Pediatria, IRCCS G. Gaslini, Genova, Italy
| | - Alice D'Adda
- Centro Fibrosi Cistica, Fondazione IRCCS Ca' Granda, Ospedale Maggiore Policlinico, Milano, Italy
| | - Marco Lucarelli
- Dipartimento di Biotecnologie Cellulari ed Ematologia, Istituto Pasteur Fondazione Cenci Bolognetti, Sapienza Università e Policlinico Umberto I, Rome, Italy
| | - Vincenzina Lucidi
- Unità di Fibrosi Cistica, IRCCS Ospedale Pediatrico Bambin Gesù, Rome, Italy
| | | | - Elisa Madarena
- Centro Fibrosi Cistica, Ospedale Giovanni Paolo II, Lamezia, Italy
| | - Rita Padoan
- Centro di supporto Fibrosi Cistica, Dipartimento di Pediatria, Università di Brescia, Brescia, Italy
| | - Serena Quattrucci
- Dipartimento di Pediatria, Centro Fibrosi Cistica, Sapienza Università e Policlinico Umberto I, Rome, Italy
| | - Donatello Salvatore
- Centro Fibrosi Cistica, Centro Pediatrico Bambino Gesù Basilicata, AOR San Carlo, Potenza, Italy
| | - Federica Zarrilli
- Dipartimento di Bioscienze e Territorio, Università del Molise, Isernia, Italy
| | - Valeria Raia
- Dipartimento di Scienze Mediche Traslazionali, Sezione di Pediatria, Università di Napoli Federico II, Naples, Italy.
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CFTR functional measurements in human models for diagnosis, prognosis and personalized therapy: Report on the pre-conference meeting to the 11th ECFS Basic Science Conference, Malta, 26-29 March 2014. J Cyst Fibros 2014; 13:363-72. [PMID: 24882694 DOI: 10.1016/j.jcf.2014.05.007] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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17
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Zvereff VV, Faruki H, Edwards M, Friedman KJ. Cystic fibrosis carrier screening in a North American population. Genet Med 2013; 16:539-46. [DOI: 10.1038/gim.2013.188] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2013] [Accepted: 10/31/2013] [Indexed: 12/25/2022] Open
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An overview of international literature from cystic fibrosis registries. Part 4: update 2011. J Cyst Fibros 2012; 11:480-93. [PMID: 22884375 DOI: 10.1016/j.jcf.2012.07.005] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2012] [Revised: 06/26/2012] [Accepted: 07/15/2012] [Indexed: 01/13/2023]
Abstract
A total of 53 national cystic fibrosis (CF) patient registry studies published between July 2008 and November 2011 have been reviewed, focusing on the following topics: CF epidemiology, nutrition, microbiology, clinical complications, factors influencing diagnosis and lung disease, effects of socioeconomic status, therapeutic strategy evaluation, clinical trial methodology. The studies describe the clinical characteristics of CF patients, the incidence and prevalence of disease and role of gender gap, as well as the influence of socioeconomic status and environmental factors on clinical outcomes, covering a variety of countries and ethnic groups. Original observations describe patients as they get older, with special reference to the adult presentation of CF and long-term survival. Methodological aspects are discussed, covering the design of clinical trials, survival analysis, auxometry, measures of quality of life, follow up of lung disease, predictability of disease progression and life expectancy. Microbiology studies have investigated the role of selected pathogens, such as Burkholderia species and MRSA. Pulmonary exacerbations are discussed both as a factor influencing morbidity and an endpoint in clinical trials. Finally, some studies give insights on complications, such as CF-related diabetes and hemoptysis, and emerging problems, such as chronic nephropathy.
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Quinton P, Molyneux L, Ip W, Dupuis A, Avolio J, Tullis E, Conrad D, Shamsuddin AK, Durie P, Gonska T. β-adrenergic sweat secretion as a diagnostic test for cystic fibrosis. Am J Respir Crit Care Med 2012; 186:732-9. [PMID: 22859523 DOI: 10.1164/rccm.201205-0922oc] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
RATIONALE β-Adrenergically induced sweat secretion offers an expedient method to assess native cystic fibrosis transmembrane conductance regulator (CFTR) secretory function in vivo. OBJECTIVES To evaluate the sensitivity, specificity, and reliability of a test based on the activity and secretory function of CFTR in the sweat gland. METHODS Primary and validation trials with prospectively ascertained healthy control subjects, obligate heterozygotes, and patients with a CFTR-related disorder and CF (pancreatic sufficient and insufficient). MEASUREMENTS AND MAIN RESULTS Diagnostic accuracy and reliability of β-adrenergic sweat secretory rates using an evaporimeter was assessed and compared with sweat chloride concentrations. The cholinergically stimulated mean sweat rate did not differ among groups. The mean maximal β-adrenergically stimulated sweat rate in heterozygotes was about half the rate of healthy control subjects, and completely absent in pancreatic-insufficient patients with CF and pancreatic-sufficient patients with CF (P < 0.0001). Subjects with a CFTR-related disorder showed reduced or absent β-adrenergic sweat secretion. The β-adrenergic secretory response demonstrated high diagnostic accuracy (area under a characteristic receiver-operator curve = 0.99; 95% confidence interval, 0.97-1.00) and reliability (intraclass correlation, 0.90; 95% confidence interval, 0.81-0.95). The diagnostic cutoff level for CF, derived from the primary trial, correctly identified all control subjects, heterozygotes, and patients with CF in the validation cohort, whereas concurrent sweat chloride measurements misclassified one heterozygote and five subjects with CF. The cholinergic and β-adrenergic sweat secretion rates were lower in women compared with men (P < 0.001). CONCLUSIONS β-Adrenergic sweat secretion rate determined by evaporimetry is an accurate and reliable technique to assess different levels of CFTR function and to identify patients with CF.
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Affiliation(s)
- Paul Quinton
- Department of Pediatrics, University of California-San Diego, La Jolla, CA, USA
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Abstract
PURPOSE OF REVIEW Newborn screening for cystic fibrosis (CF) is now universal in the US and many other countries. The rapid expansion of screening has resulted in numerous publications identifying new challenges for healthcare providers. This review provides an overview of these publications and includes ideas on managing these challenges. RECENT FINDINGS Most CF newborn screening algorithms involve DNA mutation analysis. As screening has expanded, new challenges have been identified related to carrier detection and inconclusive diagnoses. Early descriptions of infants with CF-related metabolic syndrome (CRMS) indicate that the natural history of this condition cannot be predicted. Early identification has also provided an opportunity to better understand the pathophysiology of CF. However, few studies have been conducted in infants with CF to determine optimal therapy and recommendations are largely anecdotal. SUMMARY Newborn screening provides an opportunity to identify and begin treatment early in individuals with CF. Whereas a single, optimal approach to screening does not exist, all programs can benefit from new findings regarding sweat testing, carrier detection, early pathophysiology, and clinical outcomes.
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Peleg L, Karpati M, Bronstein S, Berkenstadt M, Frydman M, Yonath H, Pras E. The D1152H cystic fibrosis mutation in prenatal carrier screening, patients and prenatal diagnosis. J Med Screen 2011; 18:169-72. [PMID: 22156145 DOI: 10.1258/jms.2011.011044] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
OBJECTIVE To assess the frequency of the D1152H mutation in the CFTR gene in normal individuals, in cystic fibrosis (CF) patients and in the setting of prenatal diagnosis. SETTING A database analysis of sequential screening results seen at the Sheba Medical Center, Israel, between 2001 and 2010. METHODS We retrospectively analyzed the frequency of D1152H in a large cohort of healthy individuals who were screened as part of a routine prenatal care programme, in individuals referred due to CF-related symptoms and in the setting of prenatal diagnosis. RESULTS We found one asymptomatic homozygous female and 195 D1152H carriers among 49,940 healthy individuals screened, establishing a carrier rate of 1:255 for this mutation. We detected D1152H in nine of 103 individuals referred due to CF-related symptoms. Four suffered from respiratory symptoms and five from congenital bilateral absence of the vas deferens (CBAVD). During this period D1152H was detected in three pregnancies, two of which were aborted. CONCLUSION The increased frequency of D1152H in individuals referred due to CF-related symptoms compared with healthy individuals included in the CF carrier screening programme (P < 0.001) clearly indicates that it is a disease-causing mutation.
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Affiliation(s)
- Leah Peleg
- The Danek Gertner Institute of Human Genetics, Sheba Medical Center, Tel Hashomer, Israel
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Rohlfs EM, Zhou Z, Heim RA, Nagan N, Rosenblum LS, Flynn K, Scholl T, Akmaev VR, Sirko-Osadsa DA, Allitto BA, Sugarman EA. Cystic fibrosis carrier testing in an ethnically diverse US population. Clin Chem 2011; 57:841-8. [PMID: 21474639 DOI: 10.1373/clinchem.2010.159285] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND The incidence of cystic fibrosis (CF) and the frequency of specific disease-causing mutations vary among populations. Affected individuals experience a range of serious clinical consequences, notably lung and pancreatic disease, which are only partially dependent on genotype. METHODS An allele-specific primer-extension reaction, liquid-phase hybridization to a bead array, and subsequent fluorescence detection were used in testing for carriers of 98 CFTR [cystic fibrosis transmembrane conductance regulator (ATP-binding cassette sub-family C, member 7)] mutations among 364 890 referred individuals with no family history of CF. RESULTS One in 38 individuals carried one of the 98 CFTR mutations included in this panel. Of the 87 different mutations detected, 18 were limited to a single ethnic group. African American, Hispanic, and Asian individuals accounted for 33% of the individuals tested. The mutation frequency distribution of Caucasians was significantly different from that of each of these ethnic groups (P < 1 × 10⁻¹⁰). CONCLUSIONS Carrier testing using a broad mutation panel detects differences in the distribution of mutations among ethnic groups in the US.
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Affiliation(s)
- Elizabeth M Rohlfs
- Molecular Diagnostic Laboratory, Genzyme Genetics, Westborough, MA 01581, USA.
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Cystic fibrosis testing 8 years on: Lessons learned from carrier screening and sequencing analysis. Genet Med 2011; 13:166-72. [DOI: 10.1097/gim.0b013e3181fa24c4] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Bareil C, Thèze C, Béroud C, Hamroun D, Guittard C, René C, Paulet D, Georges MD, Claustres M. UMD-CFTR: A database dedicated to CF and CFTR-related disorders. Hum Mutat 2010; 31:1011-9. [DOI: 10.1002/humu.21316] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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