rs76179227
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Variant summary
Our verdict is Benign. Variant got -13 ACMG points: 0P and 13B. BP4_StrongBP6_Very_StrongBS2_Supporting
The NM_000492.4(CFTR):c.4242+13A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00401 in 1,488,290 control chromosomes in the GnomAD database, including 23 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).
Frequency
Genomes: 𝑓 0.0030 ( 1 hom., cov: 33)
Exomes 𝑓: 0.0041 ( 22 hom. )
Consequence
CFTR
NM_000492.4 intron
NM_000492.4 intron
Scores
2
Clinical Significance
Conservation
PhyloP100: 0.944
Genes affected
CFTR (HGNC:1884): (CF transmembrane conductance regulator) This gene encodes a member of the ATP-binding cassette (ABC) transporter superfamily. The encoded protein functions as a chloride channel, making it unique among members of this protein family, and controls ion and water secretion and absorption in epithelial tissues. Channel activation is mediated by cycles of regulatory domain phosphorylation, ATP-binding by the nucleotide-binding domains, and ATP hydrolysis. Mutations in this gene cause cystic fibrosis, the most common lethal genetic disorder in populations of Northern European descent. The most frequently occurring mutation in cystic fibrosis, DeltaF508, results in impaired folding and trafficking of the encoded protein. Multiple pseudogenes have been identified in the human genome. [provided by RefSeq, Aug 2017]
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ACMG classification
Classification made for transcript
Verdict is Benign. Variant got -13 ACMG points.
BP4
?
Computational evidence support a benign effect (BayesDel_noAF=-0.79).
BP6
?
Variant 7-117665577-A-G is Benign according to our data. Variant chr7-117665577-A-G is described in ClinVar as [Likely_benign]. Clinvar id is 93155.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr7-117665577-A-G is described in Lovd as [Benign].
BS2
?
High Homozygotes in GnomAdExome4 at 22 AR geneVariant has number of homozygotes lower than other variant known as pathogenic in the gene, so the strength is limited to Supporting.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
CFTR | NM_000492.4 | c.4242+13A>G | intron_variant | ENST00000003084.11 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
CFTR | ENST00000003084.11 | c.4242+13A>G | intron_variant | 1 | NM_000492.4 | P2 |
Frequencies
GnomAD3 genomes ? AF: 0.00296 AC: 451AN: 152236Hom.: 1 Cov.: 33
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GnomAD3 exomes AF: 0.00344 AC: 860AN: 250278Hom.: 5 AF XY: 0.00355 AC XY: 480AN XY: 135236
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GnomAD4 exome AF: 0.00413 AC: 5511AN: 1335936Hom.: 22 Cov.: 21 AF XY: 0.00407 AC XY: 2732AN XY: 671918
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ClinVar
Significance: Benign/Likely benign
Submissions summary: Benign:18
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
Cystic fibrosis Benign:7
Benign, criteria provided, single submitter | clinical testing | Ambry Genetics | Dec 24, 2014 | This alteration is classified as benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. - |
Benign, criteria provided, single submitter | clinical testing | Mendelics | May 28, 2019 | - - |
Benign, criteria provided, single submitter | curation | CFTR-France | Jan 29, 2018 | the variant does not result in CFTR-RD neither - |
Likely benign, criteria provided, single submitter | clinical testing | Genetics and Molecular Pathology, SA Pathology | Jun 26, 2019 | - - |
Benign, criteria provided, single submitter | curation | Institute of Human Genetics, University of Leipzig Medical Center | Sep 05, 2022 | This variant was identified in 1 patient with a clinically confirmed diagnosis of cystic fibrosis. The variant was classified in the context of a project re-classifying variants in the German Cystic Fibrosis Registry (Muko.e.V.). Link: https://www.muko.info/angebote/qualitaetsmanagement/register/cf-einrichtungen/mukoweb. Criteria applied: BS2, BS3, BP4 - |
Benign, no assertion criteria provided | clinical testing | Natera, Inc. | Sep 16, 2020 | - - |
Benign, criteria provided, single submitter | clinical testing | Invitae | Feb 01, 2024 | - - |
not specified Benign:5
Benign, criteria provided, single submitter | clinical testing | Eurofins Ntd Llc (ga) | Apr 29, 2013 | - - |
Benign, no assertion criteria provided | clinical testing | Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center | - | - - |
Benign, criteria provided, single submitter | clinical testing | Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine | Jul 31, 2017 | c.4242+13A>G in intron 26 of CFTR: This variant is not expected to have clinical significance because it has been identified in 1.6% (159/10116) of Ashkenazi Je wish chromosomes by the Genome Aggregation Database (gnomAD, http://gnomad.broa dinstitute.org; dbSNP rs76179227). It was also identified in 5 homozygotes in gn omAD. - |
Likely benign, criteria provided, single submitter | clinical testing | PreventionGenetics, part of Exact Sciences | - | - - |
Benign, no assertion criteria provided | clinical testing | Genome Diagnostics Laboratory, University Medical Center Utrecht | - | - - |
not provided Benign:4
Benign, criteria provided, single submitter | clinical testing | Women's Health and Genetics/Laboratory Corporation of America, LabCorp | Jun 28, 2016 | Variant summary: The CFTR c.4242+13A>G variant involves the alteration of a non-conserved intronic nucleotide at a position not widely known to affect normal splicing. One in silico tool predicts a benign outcome for this variant. 5/5 in silico tools predict the variant not to affect splicing, and this prediction is supported by a minigene splicing assay showing no abnormal RNA products from a minigene containing this intronic variant. This variant was found in 424/120694 control chromosomes (including 1 homozygote), predominantly observed in the European (Non-Finnish) subpopulation at a frequency of 0.0051196 (333/65044). This frequency is less than the estimated maximal expected allele frequency of a pathogenic CFTR variant (0.0129603), and it cannot be ruled out that the homozygote could be affected since the ExAC cohort is a general population cohort rather than a healthy or disease-free cohort. Although this variant is found at a frequency less than the most common pathogenic CFTR variant, DeltaF508 (allele frequency in ExAC of 823/121296), c.4242+13A>G is found at a frequency greater than 2-fold higher than the second most common pathogenic CFTR variant in ExAC, c.350G>A (p.Arg117His; 185/120360), highly suggesting that c.4242+13A>G is not pathogenic.Although the variant has been found in patients reported in the literature, there are no reports that show the variants clear-cut causal role in CF and/or CBAVD. In other CFTR-RD phenotypes (asthma, DB, and COPD), this variant was observed at similar frequencies in cases and controls, supporting the notion that it is not a risk factor for these milder phenotypes either. To our knowledge, there was only one report of the variant co-occurring with a pathogenic variant, c.5T_TG11, in a diffuse bronchiectasis patient; however, c.-1043dupT (not in ClinVar and not yet internally classified) was also identified in this patient, phase of these variants was not specified, segregation studies were not performed, and authors consider the variant of interest to be a polymorphism since functional studies showed no effect on splicing (Bergougnoux_JCF_2015). Additionally, UMD reports the variant as a complex allele with c.2538G>A (p.Trp846X) and c.1521_1523delCTT (p.Phe508del) on the other allele in an individual with CF (unpublished reference), suggesting that the variant of interest is not causative in this patient. Furthermore, multiple papers as well as Emory Genetics lab via ClinVar and SickKids report the variant as a benign polymorphism. Taken together, this intronic CFTR variant has been classified as Benign. - |
Benign, criteria provided, single submitter | clinical testing | ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories | Jul 26, 2023 | - - |
Likely benign, criteria provided, single submitter | clinical testing | CeGaT Center for Human Genetics Tuebingen | Feb 01, 2024 | CFTR: BS2 - |
Benign, criteria provided, single submitter | clinical testing | Quest Diagnostics Nichols Institute San Juan Capistrano | Mar 31, 2021 | - - |
Hereditary pancreatitis Benign:1
Likely benign, criteria provided, single submitter | curation | Sema4, Sema4 | May 17, 2021 | - - |
CFTR-related disorder Benign:1
Benign, criteria provided, single submitter | clinical testing | Illumina Laboratory Services, Illumina | Apr 27, 2017 | This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). No publications were found based on this search. Allele frequency data from public databases was too high to be consistent with this variant causing disease. Therefore, this variant is classified as benign. - |
Computational scores
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Name
Calibrated prediction
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BayesDel_noAF
Benign
CADD
Benign
DANN
Benign
Splicing
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Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at