BackgroundCystic fibrosis (CF) is one of the most common life-threatening genetic disorders. Around 2000 variants in the CFTR gene have been identified, with some proportion known to be pathogenic and 300 disease-causing mutations have been characterized in detail by CFTR2 database, which complicates its analysis with conventional methods.MethodsWe conducted next-generation sequencing (NGS) in a cohort of 89 adult patients negative for p.Phe508del homozygosity. Complete clinical and demographic information were available for 84 patients.ResultsBy combining MLPA with NGS, we identified disease-causing alleles in all the CF patients. Importantly, in 10% of cases, standard bioinformatics pipelines were inefficient in identifying causative mutations. Class IV-V mutations were observed in 38 (45%) cases, predominantly ones with pancreatic sufficient CF disease; rest of the patients had Class I-III mutations. Diabetes was seen only in patients homozygous for class I-III mutations. We found that 12% of the patients were heterozygous for more than two pathogenic CFTR mutations. Two patients were observed with p.[Arg1070Gln, Ser466*] complex allele which was associated with milder pulmonary obstructions (FVC 107 and 109% versus 67%, CI 95%: 63-72%; FEV 90 and 111% versus 47%, CI 95%: 37-48%). For the first time p.[Phe508del, Leu467Phe] complex allele was reported, observed in four patients (5%).ConclusionNGS can be a more information-gaining technology compared to standard methods. Combined with its equivalent diagnostic performance, it can therefore be implemented in the clinical practice, although careful validation is still required.Electronic supplementary materialThe online version of this article (10.1186/s12920-018-0328-z) contains supplementary material, which is available to authorized users.
Кистозный фиброз-наследственное заболевание, возникающее в результате мутаций в гене регулятора трансмембранного транспорта ионов хлора (CFTR). Установление мутаций в гене CFTR необходимо для выявления клинических особенностей кистозного фиброза. Цель исследования: выявить генотип-фенотипические корреляции между мутациями первого класса патогенности и клиническими проявлениями кистозного фиброза на основе изучения распространенности и структуры мутаций гена CFTR.
Since the beginning of the COVID-19 epidemic, the European cystic fibrosis society (ECFS) has decided to launch a special ECFS-COVID-19 program to collect information on the of COVID-19 characteristics in the patients with cystic fibrosis (CF). The results of the program should help timely and efficiently provide the patients with CF with the necessary care. Initially, it was assumed that COVID-19 would be severe in CF patients. The aim. Тo assess the prevalence and characteristics of COVID-19 in patients with cystic fibrosis (CF) in the Russian Federation (RF). Methods. 6 cases (4 children and 2 adults) of COVID-19 in Russian CF patients were analyzed. Results. There are 405,843 infected with SARS-CoV-2 in Russia, the incidence of coronavirus infection in Russia was 1.4 cases per 1 thousand people. According to the Ministry of Health of the RF, as of December 2019, there were 3,931 patients with CF (2,823 children and 1,108 adults). The incidence of COVID-19 was 1.5 per 1000 patients with CF (1.4 : 1,000 for children and 1.8 : 1,000 for adults). The incidence was not higher than in the General population. The diagnosis of COVID-19 was confirmed in 4 boys and 2 women, 3 of the patients were infected with Pseudomonas aeruginosa and 2 – with Achromobacter spp. Mild disease was seen in 5 patients including all the children. Pneumonia was registered in 3 patients. One child with COVID-19 had abdominal syndrome. 2 patients – 1 adult and 1 child – needed in-patient care. Additional antibiotics were given to 4 patients, 2 of them received i/v antibiotics. One adult patient was on the lung transplantation waiting list. This woman had long-term oxygen therapy and BiPAP noninvasive respiratory support before the infection with SARS-CoV-2, FEV1 was 24 %pred. Conclusion. Despite the fact that patients with CF are at risk of severe COVID-19, to date, in the described cases, COVID-19 infection has not led to a significant deterioration of the symptoms of CF. Not a single fatal outcome in Russian patients with CF has been recorded.
The article discusses the results of a phase III clinical trial to compare the pharmacokinetics, efficacy and safety of the biosimilar medicinal product Tigerase® (dornase alpha) (Generium JSC, Russia) and the reference medicinal product Pulmozyme® (F.Hoffmann-La Roche Ltd, Switzerland) with the purpose of establishing their comparability for symptomatic treatment of patients with cystic fibrosis (CF).Methods. The study included 100 patients aged 18 years and older with a confirmed diagnosis of CF, who were divided into two groups by stratified randomization in a ratio of 1 : 1 based on the initial level of FEV1 (40–60% or > 60–100% from due value). Tigerase® or Pulmozyme® were used in a dose of 2.5 mg daily, once a day in the form of inhalations using a jet nebulizer compressor for 24 weeks.Results and discussion: The analysis of the data regarding the primary efficacy endpoint – changes in FEV1 – showed that in both groups (FAS population (Full analyses set) and PP population (Per protocol)), similar changes in FEV1 were observed. The average value of changes in FEV1 after 24 weeks of treatment compared with the initial level in the FAS population was –1.3% ± 9.8 % (95% CI (–4.1; 1.6)) in Group I (Tigerase®) and –1.9% ± 10.0% (95% CI (–4.7; 1.0)) in Group II (Pulmozyme®). The point estimate for the intergroup difference in changes in FEV1 (Group I – Group II) was 0.6%. The calculated 95% CI for the difference in changes in FEV1 in the FAS population was (–3.3; 4.6%]. In both populations studied, the intergroup difference in changes in FEV1 did not exceed 6%. During long-term treatment of patients with CF, no statistically significant differences were found in terms of efficacy (changes in FEV1 and FVC; number of exacerbations of chronic pulmonary disease and the number of days before its development; change in body weight; quality of life) between medicinal products in both studied populations (FAS and PP).Conciusion. A safety analysis demonstrated the comparability of medicinal products in terms of the incidence of adverse events. The frequency of detection of antibodies to dornase alpha during the study was similar in the treatment groups; the formation of antibodies did not lead to a decrease in the efficacy and safety of therapy.
ВведениеAspergillus spp. -это возбудители инвазивного аспергиллеза (ИА) и хронического аспергиллеза легких (ХАЛ), а также источники большого коли-чества аллергенов [1, 2]
The goal was to study the phenotypic manifestations of c.3844T>C (p.Trp1282Arg, W1282R) variant, a CF-causing mutation, in patients from the Russian Federation. Clinical manifestations and complications (the age at CF diagnosis, sweat test, pancreatic status, lung function, microbial infection, body mass index (BMI), the presence of meconium ileus (MI), diabetes, and severe liver disease) were compared in four groups: group 1—patients carrying c.3844T>C and severe class I or II variant in trans; group 2—3849+10kbC>T/F508del patients; group 3—F508del/F508del patients; and group 4—patients with W1282R and “mild” variant in trans. Based on the analyses, W1282R with class I or II variant in trans appears to cause at least as severe CF symptoms as F508del homozygotes as reflected in the early age of diagnosis, high sweat chloride concentration, insufficient pancreatic function, and low lung function, in contrast to 3849+10kbC-T/F508del compound heterozygotes having milder clinical phenotypes. The W1282R pathogenic variant is seemed to lead to severe disease phenotype with pancreatic insufficiency similarly to the F508del homozygous genotype.
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