7-117534368-A-G
Variant summary
Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PM2PP3PP5_Very_Strong
The NM_000492.4(CFTR):c.579+3A>G variant causes a splice donor region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000536 in 1,474,442 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★★).
Frequency
Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)
Exomes 𝑓: 0.000057 ( 0 hom. )
Consequence
CFTR
NM_000492.4 splice_donor_region, intron
NM_000492.4 splice_donor_region, intron
Scores
2
Splicing: ADA: 0.9995
2
Clinical Significance
Conservation
PhyloP100: 1.95
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 Pathogenic. Variant got 11 ACMG points.
PM2
?
Very rare variant in population databases, with high coverage;
PP3
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Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. No scorers claiming Uncertain. Scorers claiming Benign: max_spliceai.
PP5
?
Variant 7-117534368-A-G is Pathogenic according to our data. Variant chr7-117534368-A-G is described in ClinVar as [Pathogenic]. Clinvar id is 54010.Status of the report is reviewed_by_expert_panel, 3 stars. Variant chr7-117534368-A-G is described in Lovd as [Pathogenic]. Variant chr7-117534368-A-G is described in Lovd as [Pathogenic].
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | UniProt |
---|---|---|---|---|---|---|---|
CFTR | NM_000492.4 | c.579+3A>G | splice_donor_region_variant, intron_variant | ENST00000003084.11 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|
CFTR | ENST00000003084.11 | c.579+3A>G | splice_donor_region_variant, intron_variant | 1 | NM_000492.4 | P2 |
Frequencies
GnomAD3 genomes ? AF: 0.0000197 AC: 3AN: 152194Hom.: 0 Cov.: 32
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GnomAD3 exomes AF: 0.0000160 AC: 4AN: 249988Hom.: 0 AF XY: 0.0000296 AC XY: 4AN XY: 135242
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ClinVar
Significance: Pathogenic
Submissions summary: Pathogenic:14
Revision: reviewed by expert panel
LINK: link
Submissions by phenotype
Cystic fibrosis Pathogenic:8
Pathogenic, criteria provided, single submitter | clinical testing | Ambry Genetics | Jan 30, 2023 | The c.579+3A>G intronic pathogenic mutation (also known as 711+3 A>G) results from an A to G substitution 3 nucleotides after coding exon 5 in the CFTR gene. This mutation was first reported in two individuals with cystic fibrosis (CF) who also carried the p.F508del pathogenic mutation in trans. Both individuals had positive sweat chloride tests and respiratory disease, and one had pancreatic insufficiency (Petreska L et al. Hum Mol Genet. 1994;3(6):999-1000). This mutation has been shown to cause abnormal splicing resulting in the in-frame skipping of exon 5 (Sheridan MB et al. J Med Genet. 2011; 48(4):235-41). This pathogenic mutation is associated with pancreatic sufficiency, mildly elevated sweat chloride levels, and higher rate of Pseudomonas infection (Sosnay PR et al. Nat Genet. 2013;45(10):1160-1167). Based on the supporting evidence, this alteration is interpreted as a disease-causing mutation. - |
Pathogenic, no assertion criteria provided | clinical testing | Natera, Inc. | Sep 16, 2020 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Johns Hopkins Genomics, Johns Hopkins University | Mar 09, 2020 | Disease-causing CFTR variant. See www.CFTR2.org for phenotype information. - |
Pathogenic, criteria provided, single submitter | curation | Institute of Human Genetics, University of Leipzig Medical Center | Sep 05, 2022 | This variant was identified in 2 unrelated patients 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: PS1_MOD, PS3_MOD, PM2_SUP, PM3_VSTR, PP3 - |
Pathogenic, criteria provided, single submitter | clinical testing | Invitae | Jan 19, 2024 | This sequence change falls in intron 5 of the CFTR gene. It does not directly change the encoded amino acid sequence of the CFTR protein. RNA analysis indicates that this variant induces altered splicing and likely results in a shortened protein product. This variant is present in population databases (rs397508761, gnomAD 0.003%). This variant has been observed in individuals with cystic fibrosis, often with a second pathogenic variant in trans with this allele (PMID: 7524913, 18456578, 21097845, 23974870). ClinVar contains an entry for this variant (Variation ID: 54010). Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Studies have shown that this variant results in skipping of skipping of exon 5, but is expected to preserve the integrity of the reading-frame (PMID: 21097845). For these reasons, this variant has been classified as Pathogenic. - |
Pathogenic, criteria provided, single submitter | clinical testing | Mendelics | Nov 05, 2018 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Women's Health and Genetics/Laboratory Corporation of America, LabCorp | Oct 07, 2019 | Variant summary: CFTR c.579+3A>G alters a non-conserved nucleotide located close to a canonical splice site and therefore could affect mRNA splicing, leading to a significantly altered protein sequence. Several computational tools predict a significant impact on normal splicing: Two predict that the variant abolishes a 5' splicing donor site. In addition, several publications report experimental evidence that this variant affects mRNA splicing (e.g. Sheridan_2011, Raynal_2013, Sosnay_2013). The variant allele was found at a frequency of 1.6e-05 in 249988 control chromosomes (gnomAD). c.579+3A>G has been reported in the literature in multiple individuals affected with Cystic Fibrosis (e.g. Hughes_1996, Petereska_1998, Gilljam_2004, Krasnov_2008, Sheridan_2011, Sosnay_2013). These data indicate that the variant is very likely to be associated with disease. Four other clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All laboratories cited the variant as pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. - |
Pathogenic, reviewed by expert panel | research | CFTR2 | Mar 17, 2017 | - - |
not provided Pathogenic:2
Pathogenic, criteria provided, single submitter | clinical testing | Quest Diagnostics Nichols Institute San Juan Capistrano | May 18, 2021 | The variant is located in a splice-donor site and interferes with normal CFTR mRNA splicing. It has also been identified as a CF-causing variant in individuals with Cystic Fibrosis (CFMD (http://www.genet.sickkids.on.ca/), PMID: 18456578 (2008), 15486385 (2004), 23974870 (2013), 31523618 (2019)). Furthermore, this variant has been shown to induce aberrant splicing (CFTR2 (https://cftr2.org/), PMID: 21097845 (2011), 23381846 (2013)) and defective protein CFTR function (PMID 8968585 (1996)). Internal laboratory data indicates that this variant was detected in an individual with a phenotype consistent with disease. Based on this available information, this variant is classified as pathogenic. - |
Pathogenic, criteria provided, single submitter | clinical testing | ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories | Oct 19, 2022 | The CFTR c.579+3A>G variant (rs397508761), also known as 711+3A>G, is reported in individuals diagnosed with cystic fibrosis, and often associated with pancreatic sufficiency (CFTR2 database, Sheridan 2011). This variant is also reported in ClinVar (Variation ID: 54010). It is only observed on five alleles in the Genome Aggregation Database, indicating it is not a common polymorphism. This is an intronic variant in a moderately conserved nucleotide, and computational analyses (Alamut v.2.11) predict that this variant may impact splicing by weakening the nearby canonical donor splice site. Functional characterization indicates that the variant causes the skipping of exon 5, leading to the absence of correctly spliced mRNA (Raynal 2013, Sheridan 2011, Sosnay 2013). Based on available information, this variant is considered to be pathogenic. References: CFTR2 database: http://cftr2.org/ Raynal C et al. A classification model relative to splicing for variants of unknown clinical significance: application to the CFTR gene. Hum Mutat. 2013 May;34(5):774-84. PMID: 23381846. Sheridan MB et al. CFTR transcription defects in pancreatic sufficient cystic fibrosis patients with only one mutation in the coding region of CFTR. J Med Genet. 2011 Apr;48(4):235-41. PMID: 21097845. Sosnay PR et al. Defining the disease liability of variants in the cystic fibrosis transmembrane conductance regulator gene. Nat Genet. 2013 Oct;45(10):1160-7. PMID: 23974870. - |
Obstructive azoospermia Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Institute of Reproductive Genetics, University of Münster | Aug 23, 2021 | - - |
Cystic fibrosis;C0403814:Congenital bilateral aplasia of vas deferens from CFTR mutation Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Baylor Genetics | - | - - |
Cystic fibrosis;na:CFTR-related disorder Pathogenic:1
Pathogenic, criteria provided, single submitter | curation | CFTR-France | Jan 29, 2018 | when the variant is in trans with another CF-causing variation, can either result in CF or in a CFTR-RD - |
Bronchiectasis with or without elevated sweat chloride 1 Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Baylor Genetics | Aug 28, 2023 | - - |
Computational scores
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Name
Calibrated prediction
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BayesDel_noAF
Benign
Cadd
Uncertain
Dann
Benign
Splicing
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Calibrated prediction
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dbscSNV1_ADA
Pathogenic
dbscSNV1_RF
Pathogenic
SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at