scholarly journals Association of CFTR gene variants with nontuberculous mycobacterial lung disease in a Korean population with a low prevalence of cystic fibrosis

2013 ◽  
Vol 58 (5) ◽  
pp. 298-303 ◽  
Author(s):  
Mi-Ae Jang ◽  
Su-Young Kim ◽  
Byeong-Ho Jeong ◽  
Hye Yun Park ◽  
Kyeongman Jeon ◽  
...  
2017 ◽  
Vol 25 (3) ◽  
pp. 119-125 ◽  
Author(s):  
Isabel Ibarra-González ◽  
Felix-Julián Campos-Garcia ◽  
Luz del Alba Herrera-Pérez ◽  
Patricia Martínez-Cruz ◽  
Claudia-Margarita Moreno-Graciano ◽  
...  

Objective To use the results of the first five years of a cystic fibrosis newborn screening program to estimate the cystic fibrosis birth prevalence and spectrum of cystic fibrosis transmembrane conductance regulator ( CFTR) gene variants in Yucatan, Mexico. Methods Screening was performed from 2010 to 2015, using two-tier immunoreactive trypsinogen testing, followed by a sweat test. When sweat test values were >30 mmol/L, the CFTR gene was analyzed. Results Of 96,071 newborns screened, a second sample was requested in 119 cases. A sweat test was performed in 30 newborns, and 9 possible cases were detected (seven confirmed cystic fibrosis and two inconclusive). The most frequently detected CFTR pathogenic variant (5/14 cystic fibrosis alleles, 35.7%) was p.(Phe508del); novel p.(Ala559Pro) and p.(Thr1299Hisfs*29) pathogenic variants were found. Conclusions Cystic fibrosis birth prevalence in southeastern Mexico is 1:13,724 newborns. Immunoreactive trypsinogen blood concentration is influenced by gestational age and by the time of sampling. The spectrum of CFTR gene variants in Yucatan is heterogeneous.


2017 ◽  
Vol 4 (suppl_1) ◽  
pp. S680-S680
Author(s):  
Jennifer Adjemian ◽  
D Rebecca Prevots ◽  
Emily Ricotta ◽  
Kelly Mann ◽  
Megan Kloetzal ◽  
...  

Author(s):  
Н.В. Балинова ◽  
Н.В. Петрова ◽  
З.К. Гетоева ◽  
Н.Ю. Каширская ◽  
Т.А. Васильева ◽  
...  

Муковисцидоз (МВ) - аутосомно-рецессивное заболевание, обусловленное нарушением функции эпителиального хлорного канала, кодируемого геном CFTR. Спектр и частота вариантов последовательности гена CFTR, как и частота МВ различаются в разных странах и этнических группах. Изучено распределение частот вариантов гена CFTR у больных МВ и у здоровых индивидов в Республике Северной Осетия-Алания. Спектр патогенных вариантов у осетинских больных МВ отличается своеобразием: наиболее частыми являются два варианта W1282X (50%) и F508del (20%), тогда как в общероссийской выборке пациентов самыми частыми являются варианты F508del (52,8%) и CFTRdele2,3 (6,2%), а вариант W1282X (1,90%) относительно редок. В выборке здоровых осетин частоты выявленных вариантов W1282X и F508del составляют 0,0032 и 0,0016, соответственно. Cystic fibrosis (CF) is an autosomal recessive disease caused by impaired function of the epithelial chloride channel encoded by the CFTR gene. The spectrum and frequency of CFTR gene variants, as well as the CF incidence, vary in different countries and ethnic groups. The frequency distribution of CFTR gene variants in CF patients and in healthy individuals in the Republic of North Ossetia-Alania was studied. The spectrum of pathogenic variants in Ossetian CF patients is specific: the most frequent are two variants W1282X (50%) and F508del (20%), while in the all-Russian CF patients the most frequent are variants - F508del (52.8%) and CFTRdele2.3 (6.2%), and the variant W1282X (1.90%) is relatively rare. In healthy Ossetians, the frequencies of detected variants W1282X and F508del are 0.0032 and 0.0016, respectively. The most common CFTR gene variants are W1282X and F508del, found both in CF patients and healthy individuals from the Ossetian population of the Republic of North Ossetia-Alania.


Author(s):  
Vemulapati Bhadra Murthy ◽  
Meghana Chowdary ◽  
Sucharitha .

<p><strong>Objective: </strong>The major objective of the study was to carry out comparative bioinformatics analyses to identify different nsSNPs that were predicted to be deleterious or damaging to the structure and functions of CFTR protein causing cystic fibrosis.</p><p><strong>Methods: </strong>The CFTR gene variants (nsSNPs) and their related protein sequences from <em>Homo sapiens </em>were subjected to computational analyses using the following bioinformatics tools (a) SIFT: a sequence-homology based prediction tool that can be used to distinguish between the intolerant from tolerant SNP changes. (b) PolyPhen2: a structure and sequence-based physical and comparison tool to study the impact of amino acid substitution on the structure and function of human proteins and (c) I-Mutant2: to predict the protein stability changes arising due to single point mutations.</p><p><strong>Results: </strong>SIFT, PolyPhen2, and I-Mutant2 analyses indicated that 21 out of 108 nsSNPs were identified to be common that were strongly predicted to be deleterious and damaging for CTFR protein in cystic fibrosis conditions. Most of the substitutions in the CFTR protein contained the amino acids valine followed by cysteine and proline respectively. Homology modeling carried out to determine if any of these nsSNPs had a role in changing the conformation of CFTR protein drastically. Homology modeling of selected nsSNP variants indicated that these substitutions,however did not change the overall CFTR protein structure but predicted to cause severe damaging changes to the phenotypes of CFTR protein. Results indicated that multiple bioinformatics tools are needed to predictthe effect of substitutions and these prediction tools need to be analyzed more into detail and common determination factors are required to predict a nsSNP to be deleterious or damaging to the overall functioning of the CFTR protein.</p><p><strong>Conclusion: </strong>Multiple bioinformatics tools are in fact the need of the hour to establish if a strong relationship between nsSNPs that could alter the protein stability and cause a deleterious or damaging phenotypic change to the individual with cystic fibrosis involving the CFTR protein.</p>


2001 ◽  
Author(s):  
RS Lourenço ◽  
Filho CR Silva ◽  
LO Conterno ◽  
K Southern

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