1
|
Iacotucci P, Carnovale V, Ferrillo L, Somma J, Bocchino M, D’Ippolito M, Sanduzzi Zamparelli A, Rengo G, Ferrara N, Conti V, Corbi G. Cystic Fibrosis in Adults: A Paradigm of Frailty Syndrome? An Observational Study. J Clin Med 2024; 13:585. [PMID: 38276090 PMCID: PMC10816671 DOI: 10.3390/jcm13020585] [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: 11/13/2023] [Revised: 01/11/2024] [Accepted: 01/15/2024] [Indexed: 01/27/2024] Open
Abstract
This study aimed to assess the main clinical and anamnestic characteristics of adult Cystic Fibrosis (CF) patients and to evaluate the association of frailty with the CF genotyping classification. In an observational cross-sectional study, all ambulatory CF patients over 18 years old who received a diagnosis at the Regional Cystic Fibrosis Center for adults were enrolled and assessed by spirometry for respiratory function, by ADL and IADL for functional status, and by the Study of Osteoporotic Fractures (SOF) Index for frailty. The study population consisted of 139 CF patients (mean age 32.89 ± 10.94 years old, 46% women). Most of the subjects were robust (60.4%). The pre-frail/frail group was more frequently females (p = 0.020), had a lower BMI (p = 0.001), worse respiratory function, a higher number of pulmonary exacerbations/years, cycles of antibiotic therapy, and hospitalization (all p < 0.001) with respect to robust patients. The pre-frail/frail subjects used more drugs and were affected by more CF-related diseases (all p < 0.001). In relation to logistic regression, the best predictor of the pre-frail/frail status was a low FEV1 level. The CF patients show similarities to older pre-frail/frail subjects, suggesting that CF might be considered an early expression of this geriatric syndrome. This finding could help to better define the possible progression of CF, but overall, it could also suggest the usefulness employing of some tools used in the management and therapy of frailty subjects to identify the more severe CF subjects.
Collapse
Affiliation(s)
- Paola Iacotucci
- Department of Clinical Medicine and Surgery, University of Naples “Federico II”, 80138 Naples, Italy; (P.I.); (M.B.); (A.S.Z.)
| | - Vincenzo Carnovale
- Department of Translational Medical Sciences, University of Naples “Federico II”, 80138 Naples, Italy; (L.F.); (J.S.); (M.D.); (G.R.); (N.F.); (G.C.)
| | - Lorenza Ferrillo
- Department of Translational Medical Sciences, University of Naples “Federico II”, 80138 Naples, Italy; (L.F.); (J.S.); (M.D.); (G.R.); (N.F.); (G.C.)
| | - Jolanda Somma
- Department of Translational Medical Sciences, University of Naples “Federico II”, 80138 Naples, Italy; (L.F.); (J.S.); (M.D.); (G.R.); (N.F.); (G.C.)
| | - Marialuisa Bocchino
- Department of Clinical Medicine and Surgery, University of Naples “Federico II”, 80138 Naples, Italy; (P.I.); (M.B.); (A.S.Z.)
| | - Marcella D’Ippolito
- Department of Translational Medical Sciences, University of Naples “Federico II”, 80138 Naples, Italy; (L.F.); (J.S.); (M.D.); (G.R.); (N.F.); (G.C.)
| | - Alessandro Sanduzzi Zamparelli
- Department of Clinical Medicine and Surgery, University of Naples “Federico II”, 80138 Naples, Italy; (P.I.); (M.B.); (A.S.Z.)
| | - Giuseppe Rengo
- Department of Translational Medical Sciences, University of Naples “Federico II”, 80138 Naples, Italy; (L.F.); (J.S.); (M.D.); (G.R.); (N.F.); (G.C.)
| | - Nicola Ferrara
- Department of Translational Medical Sciences, University of Naples “Federico II”, 80138 Naples, Italy; (L.F.); (J.S.); (M.D.); (G.R.); (N.F.); (G.C.)
| | - Valeria Conti
- Department of Medicine Surgery and Dentistry, Scuola Medica Salernitana, University of Salerno, Baronissi, 84084 Salerno, Italy;
| | - Graziamaria Corbi
- Department of Translational Medical Sciences, University of Naples “Federico II”, 80138 Naples, Italy; (L.F.); (J.S.); (M.D.); (G.R.); (N.F.); (G.C.)
| |
Collapse
|
2
|
Govindan R, Banerjee P, Dhania NK, Senapati S. FTIR based approach to study EnaC mechanosensory functions. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2021; 167:79-86. [PMID: 34293339 DOI: 10.1016/j.pbiomolbio.2021.07.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2021] [Revised: 07/07/2021] [Accepted: 07/14/2021] [Indexed: 10/20/2022]
Abstract
The pulmonary epithelial sodium ion channel (ENaC) is gaining importance for its sodium gating and mechanosensitive roles. The mechano functional studies on ENaC suggest direct molecular interactions between the ENaC protein with cytoskeleton microtubules and other extracellular matrix components. Also, in few mechanotransduction studies, ENaC was shown to respond both to membrane stretch as well as cell volume changes. However, the conformational characteristic of ENaC during sodium and mechano gating are yet to be fully elucidated. Thus obtaining ENaC protein conformational spectrum based on Fourier Transform Infrared Radiation (FTIR) spectroscopy in solution will be useful in predicting the nature of conformational changes occurring during any cell volume changes in an epithelial cell. The conformational spectrum looks promising in studying the disease biology of cystic fibrosis (CF) and CF like conditions that arise due to abnormal ion conductance membrane proteins and subsequent frequent fluid retentions. This review article presents the basics of epithelial ENaC protein as a gated mechanosensor and FTIR for developing fluid dynamics of ENaC protein. This can be applied to develop an ENaC based quantum mechanosensor for the prognosis as well as diagnosis of cystic fibrosis (CF) and allied lung diseases.
Collapse
Affiliation(s)
- Rekha Govindan
- Department of Biochemistry, PM Sayeed Calicut University Centre, Andrott, Lakshadweep, 682551, India
| | - Pratibha Banerjee
- Department of Human Genetics & Molecular Medicine, Central University of Punjab, Bathinda, 151401, India
| | - Narender K Dhania
- Department of Human Genetics & Molecular Medicine, Central University of Punjab, Bathinda, 151401, India.
| | - Sabyasachi Senapati
- Department of Human Genetics & Molecular Medicine, Central University of Punjab, Bathinda, 151401, India
| |
Collapse
|
3
|
Rooj AK, Cormet-Boyaka E, Clark EB, Qadri YJ, Lee W, Boddu R, Agarwal A, Tambi R, Uddin M, Parpura V, Sorscher EJ, Fuller CM, Berdiev BK. Association of cystic fibrosis transmembrane conductance regulator with epithelial sodium channel subunits carrying Liddle's syndrome mutations. Am J Physiol Lung Cell Mol Physiol 2021; 321:L308-L320. [PMID: 34037494 DOI: 10.1152/ajplung.00298.2020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The association of the cystic fibrosis transmembrane conductance regulator (CFTR) and epithelial sodium channel (ENaC) in the pathophysiology of cystic fibrosis (CF) is controversial. Previously, we demonstrated a close physical association between wild-type (WT) CFTR and WT ENaC. We have also shown that the F508del CFTR fails to associate with ENaC unless the mutant protein is rescued pharmacologically or by low temperature. In this study, we present the evidence for a direct physical association between WT CFTR and ENaC subunits carrying Liddle's syndrome mutations. We show that all three ENaC subunits bearing Liddle's syndrome mutations (both point mutations and the complete truncation of the carboxy terminus), could be coimmunoprecipitated with WT CFTR. The biochemical studies were complemented by fluorescence lifetime imaging microscopy (FLIM), a distance-dependent approach that monitors protein-protein interactions between fluorescently labeled molecules. Our measurements revealed significantly increased fluorescence resonance energy transfer between CFTR and all tested ENaC combinations as compared with controls (ECFP and EYFP cotransfected cells). Our findings are consistent with the notion that CFTR and ENaC are within reach of each other even in the setting of Liddle's syndrome mutations, suggestive of a direct intermolecular interaction between these two proteins.
Collapse
Affiliation(s)
- Arun K Rooj
- Department of Cell, Developmental & Integrative Biology, The University of Alabama at Birmingham School of Medicine, Birmingham, Alabama
| | | | - Edlira B Clark
- Department of Cell, Developmental & Integrative Biology, The University of Alabama at Birmingham School of Medicine, Birmingham, Alabama
| | - Yawar J Qadri
- Department of Anesthesiology, The Emory University School of Medicine, Atlanta, Georgia
| | - William Lee
- Department of Neurobiology, The University of Alabama at Birmingham School of Medicine, Birmingham, Alabama
| | - Ravindra Boddu
- Department of Medicine, The University of Alabama at Birmingham School of Medicine, Birmingham, Alabama
| | - Anupam Agarwal
- Department of Medicine, The University of Alabama at Birmingham School of Medicine, Birmingham, Alabama
| | - Richa Tambi
- College of Medicine, Mohammed Bin Rashid University of Medicine and Health Sciences, Dubai, United Arab Emirates
| | - Mohammed Uddin
- College of Medicine, Mohammed Bin Rashid University of Medicine and Health Sciences, Dubai, United Arab Emirates
| | - Vladimir Parpura
- Department of Neurobiology, The University of Alabama at Birmingham School of Medicine, Birmingham, Alabama
| | - Eric J Sorscher
- Department of Pediatrics, The Emory University School of Medicine, Atlanta, Georgia
| | - Cathy M Fuller
- Department of Cell, Developmental & Integrative Biology, The University of Alabama at Birmingham School of Medicine, Birmingham, Alabama
| | - Bakhrom K Berdiev
- Department of Cell, Developmental & Integrative Biology, The University of Alabama at Birmingham School of Medicine, Birmingham, Alabama.,College of Medicine, Mohammed Bin Rashid University of Medicine and Health Sciences, Dubai, United Arab Emirates
| |
Collapse
|
4
|
Divac Rankov A, Kusic-Tisma J, Ljujic M, Nikolic A, Milosevic K, Vilotijevic Dautovic G, Radojkovic D. Molecular Diagnostics of Cystic Fibrosis in Serbia: Our Approach to Meet the Diagnostic Challenges. Genet Test Mol Biomarkers 2021; 24:212-216. [PMID: 32286879 DOI: 10.1089/gtmb.2019.0171] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Background: High heterogeneity levels of cystic fibrosis transmembrane regulator (CFTR) are manifested in different populations. The aim of this study was to analyze comprehensively all mutations in the CFTR gene in Serbian patients with cystic fibrosis (CF) and to use the findings to propose a testing algorithm for the Serbian population. Materials and Methods: Cascade screening was employed to detect mutations in the CFTR gene of 90 patients suspected of having CF, using polymerase chain reaction (PCR), PCR-restriction fragment length polymorphism or PCR-mediated site directed mutagenesis, Sanger sequencing, and/or next-generation sequencing. Results: This is the first report for the Serbian CF population where single nucleotide polymorphisms, small insertions and deletions, large genome rearrangements, and copy number variants were analyzed in detail. A high degree of heterogeneity within the CFTR was documented among our cohort of 90 patients. We identified 19 CF-causing mutations and 3 with varying consequences, including a previously unreported deletion of the entire exon 11. Conclusion: Considering the spectrum and frequency of mutations found, we recommend a multistep sequencing algorithm in combination with evaluation of large rearrangements for future analyses of the CFTR gene in the Serbian population.
Collapse
Affiliation(s)
- Aleksandra Divac Rankov
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Belgrade, Serbia
| | - Jelena Kusic-Tisma
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Belgrade, Serbia
| | - Mila Ljujic
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Belgrade, Serbia
| | - Aleksandra Nikolic
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Belgrade, Serbia
| | - Katarina Milosevic
- Department for Pulmonary and Auergology, University Children's Hospital, Belgrade, Serbia
| | | | - Dragica Radojkovic
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Belgrade, Serbia
| |
Collapse
|
5
|
Bosio M, Drechsel O, Rahman R, Muyas F, Rabionet R, Bezdan D, Domenech Salgado L, Hor H, Schott JJ, Munell F, Colobran R, Macaya A, Estivill X, Ossowski S. eDiVA-Classification and prioritization of pathogenic variants for clinical diagnostics. Hum Mutat 2019; 40:865-878. [PMID: 31026367 PMCID: PMC6767450 DOI: 10.1002/humu.23772] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Revised: 04/17/2019] [Accepted: 04/24/2019] [Indexed: 01/06/2023]
Abstract
Mendelian diseases have shown to be an and efficient model for connecting genotypes to phenotypes and for elucidating the function of genes. Whole‐exome sequencing (WES) accelerated the study of rare Mendelian diseases in families, allowing for directly pinpointing rare causal mutations in genic regions without the need for linkage analysis. However, the low diagnostic rates of 20–30% reported for multiple WES disease studies point to the need for improved variant pathogenicity classification and causal variant prioritization methods. Here, we present the exome Disease Variant Analysis (eDiVA; http://ediva.crg.eu), an automated computational framework for identification of causal genetic variants (coding/splicing single‐nucleotide variants and small insertions and deletions) for rare diseases using WES of families or parent–child trios. eDiVA combines next‐generation sequencing data analysis, comprehensive functional annotation, and causal variant prioritization optimized for familial genetic disease studies. eDiVA features a machine learning‐based variant pathogenicity predictor combining various genomic and evolutionary signatures. Clinical information, such as disease phenotype or mode of inheritance, is incorporated to improve the precision of the prioritization algorithm. Benchmarking against state‐of‐the‐art competitors demonstrates that eDiVA consistently performed as a good or better than existing approach in terms of detection rate and precision. Moreover, we applied eDiVA to several familial disease cases to demonstrate its clinical applicability.
Collapse
Affiliation(s)
- Mattia Bosio
- Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Barcelona, Spain.,Universitat Pompeu Fabra (UPF), Barcelona, Spain.,Barcelona Supercomputing Center (BSC), Barcelona, Spain
| | - Oliver Drechsel
- Bioinformatics Unit (MF1), Department for Methods Development and Research Infrastructure, Robert Koch Institute, Berlin, Germany
| | | | - Francesc Muyas
- Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Barcelona, Spain.,Universitat Pompeu Fabra (UPF), Barcelona, Spain
| | - Raquel Rabionet
- Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Barcelona, Spain.,Universitat Pompeu Fabra (UPF), Barcelona, Spain.,Institut de Recerca Sant Joan de Déu, University of Barcelona, Barcelona, Spain
| | - Daniela Bezdan
- Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Barcelona, Spain.,Universitat Pompeu Fabra (UPF), Barcelona, Spain
| | - Laura Domenech Salgado
- Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Barcelona, Spain.,Universitat Pompeu Fabra (UPF), Barcelona, Spain
| | - Hyun Hor
- Department of Neurology, University Hospital Zurich, Zurich, Switzerland
| | - Jean-Jacques Schott
- L'Institut du Thorax, INSERM, CNRS, Univ Nantes, Nantes, France.,Service de Cardiologie, L'institut du thorax, CHU Nantes, Nantes, France
| | | | - Roger Colobran
- Vall d'Hebron Institut de Recerca (VHIR), Barcelona, Spain
| | - Alfons Macaya
- Vall d'Hebron Institut de Recerca (VHIR), Barcelona, Spain
| | - Xavier Estivill
- Sidra Medicine, Doha, Qatar.,Women's Health Dexeus, Barcelona, Spain
| | - Stephan Ossowski
- Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Barcelona, Spain.,Universitat Pompeu Fabra (UPF), Barcelona, Spain.,Institute of Medical Genetics and Applied Genomics, University of Tübingen, Tübingen, Germany
| |
Collapse
|
6
|
Moore PJ, Tarran R. The epithelial sodium channel (ENaC) as a therapeutic target for cystic fibrosis lung disease. Expert Opin Ther Targets 2018; 22:687-701. [PMID: 30028216 DOI: 10.1080/14728222.2018.1501361] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
INTRODUCTION Cystic fibrosis is an autosomal recessive disorder caused by mutations in the cystic fibrosis transmembrane conductance regulator (CFTR) gene that codes for the CFTR anion channel. In the absence of functional CFTR, the epithelial Na+ channel is also dysregulated. Airway surface liquid (ASL) hydration is maintained by a balance between epithelial sodium channel (ENaC)-led Na+ absorption and CFTR-dependent anion secretion. This finely tuned homeostatic mechanism is required to maintain sufficient airway hydration to permit the efficient mucus clearance necessary for a sterile lung environment. In CF airways, the lack of CFTR and increased ENaC activity lead to ASL/mucus dehydration that causes mucus obstruction, neutrophilic infiltration, and chronic bacterial infection. Rehydration of ASL/mucus in CF airways can be achieved by inhibiting Na+ absorption with pharmacological inhibitors of ENaC. Areas covered: In this review, we discuss ENaC structure and function and its role in CF lung disease and focus on ENaC inhibition as a potential therapeutic target to rehydrate CF mucus. We also discuss the failure of the first generation of pharmacological inhibitors of ENaC and recent alternate strategies to attenuate ENaC activity in the CF lung. Expert opinion: ENaC is an attractive therapeutic target to rehydrate CF ASL that may serve as a monotherapy or function in parallel with other treatments. Given the increased number of strategies being employed to inhibit ENaC, this is an exciting and optimistic time to be in this field.
Collapse
Affiliation(s)
- Patrick J Moore
- a Marsico Lung Institute , University of North Carolina , Chapel Hill , NC , USA
| | - Robert Tarran
- a Marsico Lung Institute , University of North Carolina , Chapel Hill , NC , USA.,b Department of Cell Biology & Physiology , University of North Carolina , Chapel Hill , NC , USA
| |
Collapse
|
7
|
Polfus LM, Boerwinkle E, Gibbs RA, Metcalf G, Muzny D, Veeraraghavan N, Grove M, Shete S, Wallace S, Milewicz D, Hanchard N, Lupski JR, Hashmi SS, Gupta-Malhotra M. Whole-exome sequencing reveals an inherited R566X mutation of the epithelial sodium channel β-subunit in a case of early-onset phenotype of Liddle syndrome. Cold Spring Harb Mol Case Stud 2017; 2:a001255. [PMID: 27900368 PMCID: PMC5111009 DOI: 10.1101/mcs.a001255] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
To comprehensively evaluate a European–American child with severe hypertension, whole-exome sequencing (WES) was performed on the child and parents, which identified causal variation of the proband's early-onset disease. The proband's hypertension was resistant to treatment, requiring a multiple drug regimen including amiloride, spironolactone, and hydrochlorothiazide. We suspected a monogenic form of hypertension because of the persistent hypokalemia with low plasma levels of renin and aldosterone. To address this, we focused on rare functional variants and indels, and performed gene-based tests incorporating linkage scores and allele frequency and filtered on deleterious functional mutations. Drawing upon clinical presentation, 27 genes were selected evidenced to cause monogenic hypertension and matched to the gene-based results. This resulted in the identification of a stop-gain mutation in an epithelial sodium channel (ENaC), SCNN1B, an established Liddle syndrome gene, shared by the child and her father. Interestingly, the father also harbored a missense mutation (p.Trp552Arg) in the α-subunit of the ENaC trimer, SCNN1A, possibly pointing to pseudohypoaldosteronism type I. This case is unique in that we present the early-onset disease and treatment response caused by a canonical stop-gain mutation (p.Arg566*) as well as ENaC digenic hits in the father, emphasizing the utility of WES informing precision medicine.
Collapse
Affiliation(s)
- Linda M Polfus
- Human Genetics Center, The University of Texas Health Science Center at Houston, Houston, Texas 70130, USA
| | - Eric Boerwinkle
- Human Genetics Center, The University of Texas Health Science Center at Houston, Houston, Texas 70130, USA;; Human Genome Sequencing Center, Baylor College of Medicine, Houston, Texas 70130, USA
| | - Richard A Gibbs
- Human Genome Sequencing Center, Baylor College of Medicine, Houston, Texas 70130, USA
| | - Ginger Metcalf
- Human Genome Sequencing Center, Baylor College of Medicine, Houston, Texas 70130, USA
| | - Donna Muzny
- Human Genome Sequencing Center, Baylor College of Medicine, Houston, Texas 70130, USA
| | | | - Megan Grove
- Human Genetics Center, The University of Texas Health Science Center at Houston, Houston, Texas 70130, USA
| | - Sanjay Shete
- Department of Biostatistics, MD Anderson Cancer Center, The University of Texas Health Science Center, Houston, Texas 77030, USA
| | - Stephanie Wallace
- Division of Medical Genetics, Department of Internal Medicine, The University of Texas Health Science Center, Houston, Texas 77030, USA
| | - Dianna Milewicz
- Division of Medical Genetics, Department of Internal Medicine, The University of Texas Health Science Center, Houston, Texas 77030, USA
| | - Neil Hanchard
- Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas 70130, USA
| | - James R Lupski
- Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas 70130, USA
| | - Syed Shahrukh Hashmi
- Department of Pediatrics, Children's Memorial Hermann Hospital, The University of Texas Health Science Center, Houston, Texas, Medical School, Texas 77030, USA
| | - Monesha Gupta-Malhotra
- Department of Pediatric Cardiology, Johns Hopkins All Children's Hospital, St. Petersburg, Florida 33701, USA
| |
Collapse
|
8
|
Zhang Y, Fang X, Xu H, Shen Q. Genetic Analysis of Dent's Disease and Functional Research of CLCN5 Mutations. DNA Cell Biol 2017; 36:1151-1158. [PMID: 29058463 DOI: 10.1089/dna.2017.3731] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Dent's disease is an X-linked inherited renal disease. Patients with Dent's disease often carry mutations in genes encoding the Cl-/H+ exchanger ClC-5 and/or inositol polyphosphate 5-phosphatase (OCRL1). However, the mutations involved and the biochemical effects of these mutations are not fully understood. To characterize genetic changes in Dent's disease patients, in this study, samples from nine Chinese patients were subjected to genetic analysis. Among the nine patients, six were classified as having Dent-1 disease, one had Dent-2 disease, and two could not be classified. Expression of ClC-5 carrying Dent's disease-associated mutations in HEK293 cells had varying effects: (1) no detectable expression of mutant protein; (2) retention of a truncated protein in the endoplasmic reticulum; or (3) diminished protein expression with normal distribution in early endosomes. Dent's disease patients showed genetic heterogeneity and over 20% of patients did not have CLCN5 or OCRL1 mutations, suggesting the existence of other genetic factors. Using next-generation sequencing, we identified possible modifier genes that have not been previously reported in Dent's disease patients. Heterozygous variants in CFTR, SCNN1A, and SCNN1B genes associated with cystic fibrosis (CF) or CF-like disease were detected in four of our nine patients. These results may form the basis for future characterization of Dent's disease and genetic counseling approaches.
Collapse
Affiliation(s)
- Ya Zhang
- 1 Department of Nephrology, Children's Hospital of Fudan University , Shanghai, China .,2 Shanghai Kidney Development and Pediatric Kidney Disease Research Center , Shanghai, China
| | - Xiaoyan Fang
- 1 Department of Nephrology, Children's Hospital of Fudan University , Shanghai, China .,2 Shanghai Kidney Development and Pediatric Kidney Disease Research Center , Shanghai, China
| | - Hong Xu
- 1 Department of Nephrology, Children's Hospital of Fudan University , Shanghai, China .,2 Shanghai Kidney Development and Pediatric Kidney Disease Research Center , Shanghai, China
| | - Qian Shen
- 1 Department of Nephrology, Children's Hospital of Fudan University , Shanghai, China .,2 Shanghai Kidney Development and Pediatric Kidney Disease Research Center , Shanghai, China
| |
Collapse
|
9
|
Mortezaei Z, Lanjanian H, Masoudi-Nejad A. Candidate novel long noncoding RNAs, MicroRNAs and putative drugs for Parkinson's disease using a robust and efficient genome-wide association study. Genomics 2017; 109:158-164. [DOI: 10.1016/j.ygeno.2017.02.004] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2016] [Revised: 02/02/2017] [Accepted: 02/15/2017] [Indexed: 12/30/2022]
|
10
|
Straniero L, Soldà G, Costantino L, Seia M, Melotti P, Colombo C, Asselta R, Duga S. Whole-gene CFTR sequencing combined with digital RT-PCR improves genetic diagnosis of cystic fibrosis. J Hum Genet 2016; 61:977-984. [PMID: 27488443 DOI: 10.1038/jhg.2016.101] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Revised: 05/31/2016] [Accepted: 07/07/2016] [Indexed: 11/09/2022]
Abstract
Despite extensive screening, 1-5% of cystic fibrosis (CF) patients lack a definite molecular diagnosis. Next-generation sequencing (NGS) is making affordable genetic testing based on the identification of variants in extended genomic regions. In this frame, we analyzed 23 CF patients and one carrier by whole-gene CFTR resequencing: 4 were previously characterized and served as controls; 17 were cases lacking a complete diagnosis after a full conventional CFTR screening; 3 were consecutive subjects referring to our centers, not previously submitted to any screening. We also included in the custom NGS design the coding portions of the SCNN1A, SCNN1B and SCNN1G genes, encoding the subunits of the sodium channel ENaC, which were found to be mutated in CF-like patients. Besides 2 novel SCNN1B missense mutations, we identified 22 previously-known CFTR mutations, including 2 large deletions (whose breakpoints were precisely mapped), and novel deep-intronic variants, whose role on splicing was excluded by ex-vivo analyses. Finally, for 2 patients, compound heterozygotes for a CFTR mutation and the intron-9c.1210-34TG[11-12]T5 allele-known to be associated with decreased CFTR mRNA levels-the molecular diagnosis was implemented by measuring the residual level of wild-type transcript by digital reverse transcription polymerase chain reaction performed on RNA extracted from nasal brushing.
Collapse
Affiliation(s)
- Letizia Straniero
- Department of Medical Biotechnology and Translational Medicine, University of Milan, Milan, Italy
| | - Giulia Soldà
- Department of Biomedical Sciences, Humanitas University, Milan, Italy.,Humanitas Clinical and Research Center, Milan, Italy
| | - Lucy Costantino
- Medical Genetics Laboratory, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Manuela Seia
- Medical Genetics Laboratory, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Paola Melotti
- Cystic Fibrosis Center, Azienda Ospedaliera Universitaria Integrata di Verona, Verona, Italy
| | - Carla Colombo
- Cystic Fibrosis Center of Milan, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Rosanna Asselta
- Department of Biomedical Sciences, Humanitas University, Milan, Italy.,Humanitas Clinical and Research Center, Milan, Italy
| | - Stefano Duga
- Department of Biomedical Sciences, Humanitas University, Milan, Italy.,Humanitas Clinical and Research Center, Milan, Italy
| |
Collapse
|
11
|
Hanukoglu I, Hanukoglu A. Epithelial sodium channel (ENaC) family: Phylogeny, structure-function, tissue distribution, and associated inherited diseases. Gene 2016; 579:95-132. [PMID: 26772908 PMCID: PMC4756657 DOI: 10.1016/j.gene.2015.12.061] [Citation(s) in RCA: 238] [Impact Index Per Article: 29.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Revised: 12/20/2015] [Accepted: 12/22/2015] [Indexed: 01/24/2023]
Abstract
The epithelial sodium channel (ENaC) is composed of three homologous subunits and allows the flow of Na(+) ions across high resistance epithelia, maintaining body salt and water homeostasis. ENaC dependent reabsorption of Na(+) in the kidney tubules regulates extracellular fluid (ECF) volume and blood pressure by modulating osmolarity. In multi-ciliated cells, ENaC is located in cilia and plays an essential role in the regulation of epithelial surface liquid volume necessary for cilial transport of mucus and gametes in the respiratory and reproductive tracts respectively. The subunits that form ENaC (named as alpha, beta, gamma and delta, encoded by genes SCNN1A, SCNN1B, SCNN1G, and SCNN1D) are members of the ENaC/Degenerin superfamily. The earliest appearance of ENaC orthologs is in the genomes of the most ancient vertebrate taxon, Cyclostomata (jawless vertebrates) including lampreys, followed by earliest representatives of Gnathostomata (jawed vertebrates) including cartilaginous sharks. Among Euteleostomi (bony vertebrates), Actinopterygii (ray finned-fishes) branch has lost ENaC genes. Yet, most animals in the Sarcopterygii (lobe-finned fish) branch including Tetrapoda, amphibians and amniotes (lizards, crocodiles, birds, and mammals), have four ENaC paralogs. We compared the sequences of ENaC orthologs from 20 species and established criteria for the identification of ENaC orthologs and paralogs, and their distinction from other members of the ENaC/Degenerin superfamily, especially ASIC family. Differences between ENaCs and ASICs are summarized in view of their physiological functions and tissue distributions. Structural motifs that are conserved throughout vertebrate ENaCs are highlighted. We also present a comparative overview of the genotype-phenotype relationships in inherited diseases associated with ENaC mutations, including multisystem pseudohypoaldosteronism (PHA1B), Liddle syndrome, cystic fibrosis-like disease and essential hypertension.
Collapse
Affiliation(s)
- Israel Hanukoglu
- Laboratory of Cell Biology, Faculty of Natural Sciences, Ariel University, Ariel, Israel.
| | - Aaron Hanukoglu
- Division of Pediatric Endocrinology, E. Wolfson Medical Center, Holon, Israel; Sackler School of Medicine, Tel-Aviv University, Tel Aviv, Israel
| |
Collapse
|
12
|
Assessment of epithelial sodium channel variants in nonwhite cystic fibrosis patients with non-diagnostic CFTR genotypes. J Cyst Fibros 2016; 15:52-9. [DOI: 10.1016/j.jcf.2015.04.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Revised: 03/31/2015] [Accepted: 04/01/2015] [Indexed: 11/23/2022]
|
13
|
Griesenbach U, Alton EW. Recent advances in understanding and managing cystic fibrosis transmembrane conductance regulator dysfunction. F1000PRIME REPORTS 2015; 7:64. [PMID: 26097737 PMCID: PMC4447040 DOI: 10.12703/p7-64] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Cystic fibrosis is the most common autosomal recessive genetic disease in Caucasians and has been extensively studied for many decades. The cystic fibrosis transmembrane conductance regulator gene was identified in 1989. It encodes a complex protein which has numerous cellular functions. Our understanding of cystic fibrosis pathophysiology and genetics is constantly expanding and being refined, leading to improved management of the disease and increased life expectancy in affected individuals.
Collapse
|