ClinVar Miner

Submissions for variant NM_000492.4(CFTR):c.3231_3232del (p.Phe1078fs)

dbSNP: rs779177972
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Total submissions: 6
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Mendelics RCV000757837 SCV000886326 pathogenic Cystic fibrosis 2018-11-05 criteria provided, single submitter clinical testing
Johns Hopkins Genomics, Johns Hopkins University RCV000757837 SCV001573141 pathogenic Cystic fibrosis 2021-04-29 criteria provided, single submitter clinical testing
Labcorp Genetics (formerly Invitae), Labcorp RCV000757837 SCV003440107 pathogenic Cystic fibrosis 2023-08-01 criteria provided, single submitter clinical testing This sequence change creates a premature translational stop signal (p.Phe1078Profs*77) in the CFTR gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in CFTR are known to be pathogenic (PMID: 1695717, 7691345, 9725922). This variant is present in population databases (rs779177972, gnomAD 0.003%). This premature translational stop signal has been observed in individual(s) with cystic fibrosis (PMID: 26574590). ClinVar contains an entry for this variant (Variation ID: 618934). For these reasons, this variant has been classified as Pathogenic.
Women's Health and Genetics/Laboratory Corporation of America, LabCorp RCV000757837 SCV004100220 pathogenic Cystic fibrosis 2023-09-04 criteria provided, single submitter clinical testing Variant summary: CFTR c.3231_3232delGT (p.Phe1078ProfsX77) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. The variant allele was found at a frequency of 4e-06 in 251060 control chromosomes. c.3231_3232delGT has been reported in the literature in individuals affected with Cystic Fibrosis (eg. Kharrazi_2015, etc.). The following publication have been ascertained in the context of this evaluation (PMID: 26574590). Three submitters have cited clinical-significance assessments for this variant to ClinVar after 2014. All submitters classified the variant as pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic.
Baylor Genetics RCV003472277 SCV004213544 likely pathogenic Bronchiectasis with or without elevated sweat chloride 1 2023-03-11 criteria provided, single submitter clinical testing
Ambry Genetics RCV000757837 SCV005984157 pathogenic Cystic fibrosis 2025-03-11 criteria provided, single submitter clinical testing The c.3231_3232delGT pathogenic mutation, located in coding exon 20 of the CFTR gene, results from a deletion of two nucleotides at nucleotide positions 3231 to 3232, causing a translational frameshift with a predicted alternate stop codon (p.F1078Pfs*77). This alteration is expected to result in loss of function by premature protein truncation or nonsense-mediated mRNA decay. As such, this alteration is interpreted as a disease-causing mutation.

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