chr7-117614706-A-G

Variant names:

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM1PM2PP3_Strong

The NM_000492.4(CFTR):c.3461A>G(p.Asp1154Gly) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000206 in 1,455,666 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: not found (cov: 31)

Exomes 𝑓: 0.0000021 ( 0 hom. )

Consequence

CFTR
NM_000492.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1U:3O:1

Conservation

PhyloP100: 9.14

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:

ENSG00000083622 (HGNC:):

ENSG00000083622 links:

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ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

PM1

In a mutagenesis_site Decreases channel activity, no visible effect on protein maturation. (size 0) in uniprot entity CFTR_HUMAN

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.961

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CFTR	NM_000492.4 link	c.3461A>G	p.Asp1154Gly	missense_variant	Exon 21 of 27	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.3461A>G	p.Asp1154Gly	missense_variant	Exon 21 of 27	1	NM_000492.4	ENSP00000003084.6		P13569-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD3 exomes

AF:

0.00000399

AC:

AN:

250930

Hom.:

AF XY:

0.00000737

AC XY:

AN XY:

135632

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:

0.00000882

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000206

AC:

AN:

1455666

Hom.:

Cov.:

AF XY:

0.00000276

AC XY:

AN XY:

724528

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:

0.00000181

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

Cov.:

Alfa

AF:

0.0000434

Hom.:

Bravo

AF:

0.00000756

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1Uncertain:3Other:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Cystic fibrosis

Uncertain:1Other:1

Jul 24, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.D1154G variant (also known as c.3461A>G), located in coding exon 21 of the CFTR gene, results from an A to G substitution at nucleotide position 3461. The aspartic acid at codon 1154 is replaced by glycine, an amino acid with similar properties. In one functional study, this alteration impacted the proper gating of the chloride channel (Vankeerberghen A et al. FEBS Lett, 1998 Oct;437:1-4). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Based on the available evidence, the clinical significance of this variant remains unclear. -

ClinVar Staff, National Center for Biotechnology Information (NCBI)

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

- -

CFTR-related disorder

Pathogenic:1

Jan 29, 2018

CFTR-France

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: curation

- -

not specified

Uncertain:1

May 24, 2023

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

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: CFTR c.3461A>G (p.Asp1154Gly) results in a non-conservative amino acid change located in the ABC transporter type 1, transmembrane domain (IPR011527) of the encoded protein sequence. Four of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 4e-06 in 250930 control chromosomes. c.3461A>G has been reported in the literature as a non-informative genotype (second allele not specified) in individuals affected with CBAVD/CAVD and Cystic Fibrosis (Claustres_2000, Green_2010, Yang_2015). These report(s) do not provide unequivocal conclusions about association of the variant with Cystic Fibrosis/CFTR-related disorders. At least one publication reports experimental evidence evaluating an impact on protein function. The most pronounced variant effect results in impaired chloride channel activity (Vankeerberghen_1998). The following publications have been ascertained in the context of this evaluation (PMID: 10923036, 20932301, 9804160, 26277102). CFTR-France database has submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation and classifying the variant as pathogenic. Based on the evidence outlined above, the variant was classified as VUS-possibly pathogenic. -

not provided

Uncertain:1

May 30, 2023

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Observed in at least one individual with congenital absence of the vas deferens who also harbored a second CFTR variant, but segregation data and additional clinical information was not included (Claustres et al., 2000; Costes et al., 1995; De Braekeleer et al., 1996); Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 28603918, 20059485, 9804160, 31674704, 8556303, 9239681, 16442101, 12940920, 10923036) -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.90

BayesDel_addAF

Pathogenic

0.49

BayesDel_noAF

Pathogenic

0.47

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.85

D;.;.;T;.

Eigen

Uncertain

0.56

Eigen_PC

Uncertain

0.63

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Pathogenic

0.98

D;D;D;D;D

M_CAP

Pathogenic

0.56

MetaRNN

Pathogenic

0.96

D;D;D;D;D

MetaSVM

Benign

-0.31

MutationAssessor

Uncertain

2.5

M;.;.;.;.

PrimateAI

Uncertain

0.69

PROVEAN

Uncertain

-4.2

D;.;.;D;.

REVEL

Pathogenic

0.97

Sift

Uncertain

0.0020

D;.;.;D;.

Sift4G

Uncertain

0.0020

D;.;.;D;.

Polyphen

1.0

D;.;.;.;.

Vest4

0.90

MutPred

0.84

Gain of MoRF binding (P = 0.0325);.;.;.;.;

MVP

0.99

MPC

0.0052

ClinPred

0.99

GERP RS

5.9

Varity_R

0.97

gMVP

0.94

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.16

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