7-117534368-A-G

Variant names:

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 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. 2/3 splice prediction tools predicting alterations to normal splicing. 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_region, intron

Scores

Splicing: ADA: 0.9995

Clinical Significance

Pathogenic reviewed by expert panel P:16

Conservation

PhyloP100: 1.95

Variant links:

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]

CFTR links:

Genome browser will be placed here

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

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 rank	MANE	Protein	UniProt
CFTR	NM_000492.4 link	c.579+3A>G		splice_region_variant, intron_variant	Intron 5 of 26	ENST00000003084.11	NP_000483.3	P13569-1A0A024R730

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CFTR	ENST00000003084.11 link	c.579+3A>G		splice_region_variant, intron_variant	Intron 5 of 26	1	NM_000492.4	ENSP00000003084.6		P13569-1

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152194

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000160

AC:

AN:

249988

Hom.:

AF XY:

0.0000296

AC XY:

AN XY:

135242

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000353

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000575

AC:

AN:

1322248

Hom.:

Cov.:

AF XY:

0.0000586

AC XY:

AN XY:

665960

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000751

Gnomad4 OTH exome

AF:

0.0000358

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152194

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74358

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.0000655

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000151

EpiCase

AF:

0.000164

EpiControl

AF:

0.000119

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:16

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

Cystic fibrosis

Pathogenic:9

Feb 25, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. -

Sep 05, 2022

Institute of Human Genetics, University of Leipzig Medical Center

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: curation

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 -

Jan 30, 2023

Ambry Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. -

Mar 09, 2020

Johns Hopkins Genomics, Johns Hopkins University

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Disease-causing CFTR variant. See www.CFTR2.org for phenotype information. -

Nov 05, 2018

Mendelics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Oct 07, 2019

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. -

Mar 17, 2017

CFTR2

Significance: Pathogenic

Review Status: reviewed by expert panel

Collection Method: research

- -

Feb 01, 2024

Laboratory of Medical Genetics, National & Kapodistrian University of Athens

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: curation

- -

Sep 16, 2020

Natera, Inc.

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

not provided

Pathogenic:2

May 18, 2021

Quest Diagnostics Nichols Institute San Juan Capistrano

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. -

Oct 19, 2022

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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

Aug 23, 2021

Institute of Reproductive Genetics, University of Münster

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Cystic fibrosis;C0403814:Congenital bilateral aplasia of vas deferens from CFTR mutation

Pathogenic:1

Baylor Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Cystic fibrosis;C0238339:Hereditary pancreatitis;C0403814:Congenital bilateral aplasia of vas deferens from CFTR mutation;C2749757:Bronchiectasis with or without elevated sweat chloride 1

Pathogenic:1

Oct 27, 2021

Department of Pathology and Laboratory Medicine, Sinai Health System

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

Bronchiectasis with or without elevated sweat chloride 1

Pathogenic:1

Feb 15, 2024

Baylor Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Cystic fibrosis;C5924204:CFTR-related disorder

Pathogenic:1

Jan 29, 2018

CFTR-France

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: curation

when the variant is in trans with another CF-causing variation, can either result in CF or in a CFTR-RD -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.26

CADD

Uncertain

DANN

Benign

0.90

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

0.93

SpliceAI score (max)

0.17

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over