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http://purl.uniprot.org/citations/27447098http://www.w3.org/1999/02/22-rdf-syntax-ns#typehttp://purl.uniprot.org/core/Journal_Citation
http://purl.uniprot.org/citations/27447098http://www.w3.org/2000/01/rdf-schema#comment"

Background

At the cystic fibrosis transmembrane conductance regulator (CFTR) gene (IVS8)-(TG)m(T)n locus, a lower number of thymidines (legacy names 9T vs. 7T vs. 5T) and a higher number of (TG) repeats (TG-11 vs. 12 vs. 13) are associated with decreasing translation of functional CFTR protein in vitro.

Methods

Retrospective cohort study comparing phenotypes of California CF newborn screen-positive children (followed 2-8 years) who had two CF-causing mutations (diagnosed as CF) with those who had one mutation from a panel of 40 CF-causing mutations (CF40mut) and one (IVS8)-(TG)11, 12, or 13-5T mutation detected by sequencing (diagnosed as CFTR-related metabolic syndrome [cRMS]).

Results

The study included 428 children, of which 234 had two CF-causing mutations, and were used to compare with the other 194 children with one CF-causing mutation and one isolated 5T allele [CF40mut/(TG)13-5T = 21, CF40mut/(TG)12-5T = 85, and CF40mut/(TG)11-5T = 88]. Among children with CF40mut/(TG)13-5T, 38% were diagnosed with CF by 8 years, based on sweat chloride results and clinical presentation. Six percent of those with CF40mut/(TG)12-5T, and none with CF40mut/(TG)11-5T, reached diagnostic criteria.

Conclusions

CFTR (IVS8)-(TG)m-5T allele (TG) tract length determination provides valuable information in predicting the risk of developing a CF phenotype. Of the three types of 5T alleles evaluated, screen-positive children with genotype CF40mut/(TG)13-5T progressed from CRMS to CF at a high rate, while there was little evidence of clinical disease in those with CF40mut/(TG)11-5T. Additional data from longer follow-up intervals are needed to fully understand the natural history of individuals with a CF40mut/(TG)m-5T genotype."xsd:string
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http://purl.uniprot.org/citations/27447098http://purl.uniprot.org/core/author"Young S."xsd:string
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http://purl.uniprot.org/citations/27447098http://purl.uniprot.org/core/author"Kharrazi M."xsd:string
http://purl.uniprot.org/citations/27447098http://purl.uniprot.org/core/author"Keens T.G."xsd:string
http://purl.uniprot.org/citations/27447098http://purl.uniprot.org/core/author"Salinas D.B."xsd:string
http://purl.uniprot.org/citations/27447098http://purl.uniprot.org/core/date"2016"xsd:gYear
http://purl.uniprot.org/citations/27447098http://purl.uniprot.org/core/name"Genet Test Mol Biomarkers"xsd:string
http://purl.uniprot.org/citations/27447098http://purl.uniprot.org/core/pages"496-503"xsd:string
http://purl.uniprot.org/citations/27447098http://purl.uniprot.org/core/title"Phenotypes of California CF Newborn Screen-Positive Children with CFTR 5T Allele by TG Repeat Length."xsd:string
http://purl.uniprot.org/citations/27447098http://purl.uniprot.org/core/volume"20"xsd:string
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