chr7-117614654-A-G

Position:

chr7-117614654-A-G

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PM1PM2PP3_StrongPP5

The NM_000492.4(CFTR):c.3409A>G(p.Met1137Val) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000416 in 1,612,462 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: 𝑓 0.000046 ( 0 hom., cov: 31)

Exomes 𝑓: 0.000041 ( 0 hom. )

Consequence

CFTR
NM_000492.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:3U:5O: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:

(HGNC:):

links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_pathogenic. Variant got 9 ACMG points.

PM1

In a mutagenesis_site Abolishes channel activity. Impairs protein maturation, suggesting the protein is retained in the endoplasmic reticulum. (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, 0.958

PP5

Variant 7-117614654-A-G is Pathogenic according to our data. Variant chr7-117614654-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 53733.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=3, not_provided=1, Uncertain_significance=4}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CFTR	NM_000492.4 linkuse as main transcript	c.3409A>G	p.Met1137Val	missense_variant	21/27	ENST00000003084.11	NP_000483.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CFTR	ENST00000003084.11 linkuse as main transcript	c.3409A>G	p.Met1137Val	missense_variant	21/27	1	NM_000492.4	ENSP00000003084	P2	P13569-1
	ENST00000456270.1 linkuse as main transcript	n.177+1575T>C		intron_variant, non_coding_transcript_variant		3

Frequencies

GnomAD3 genomes

AF:

0.0000460

AC:

AN:

152150

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000656

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:

0.0000882

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000358

AC:

AN:

251148

Hom.:

AF XY:

0.0000442

AC XY:

AN XY:

135720

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:

0.0000793

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000411

AC:

AN:

1460312

Hom.:

Cov.:

AF XY:

0.0000427

AC XY:

AN XY:

726498

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:

0.0000504

Gnomad4 OTH exome

AF:

0.0000663

GnomAD4 genome

AF:

0.0000460

AC:

AN:

152150

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74328

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.0000656

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000882

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000170

Hom.:

Bravo

AF:

0.0000491

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.00

AC:

ExAC

AF:

0.0000165

AC:

EpiCase

AF:

0.000164

EpiControl

AF:

0.000178

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:3Uncertain:5Other:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Cystic fibrosis

Pathogenic:1Uncertain:2Other:1

Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jul 27, 2022	This sequence change replaces methionine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 1137 of the CFTR protein (p.Met1137Val). This variant is present in population databases (rs397508553, gnomAD 0.005%). This missense change has been observed in individual(s) with cystic fibrosis, bronchiectasis, congenital bilateral absence of vas deferens and hypertrypsinaemia (PMID: 7543317, 9921909, 11303517, 12454843, 22678879, 25910067, 26436105). ClinVar contains an entry for this variant (Variation ID: 53733). Algorithms developed to predict the effect of missense changes on protein structure and function (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated. Experimental studies have shown that this missense change affects CFTR function (PMID: 26436105). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -
not provided, no classification provided	literature only	ClinVar Staff, National Center for Biotechnology Information (NCBI)	-	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Jul 14, 2021	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Ambry Genetics	May 28, 2024	The p.M1137V variant (also known as c.3409A>G), located in coding exon 21 of the CFTR gene, results from an A to G substitution at nucleotide position 3409. The methionine at codon 1137 is replaced by valine, an amino acid with highly similar properties. This variant has been detected in individuals with cystic fibrosis or congenital bilateral absence of the vas deferens who carried an additional pathogenic/likely pathogenic variant (Iuliano L et al. Am J Clin Nutr, 2009 Sep;90:477-84; El-Seedy A et al. Hum Mutat, 2012 Nov;33:1557-65; Jabr S et al. Prostaglandins Leukot Essent Fatty Acids, 2013 Aug;89:121-6; Clarke LA et al. Hum Mutat, 2019 Mar;40:326-334). However, it has also been detected in trans with p.F508del in a neonate who had elevated immunoreactive trypsinogen concentration, but normal sweat chloride level (Castellani C et al. J Med Genet, 2001 Mar;38:202-5). Based on internal structural analysis, M1137V is more disruptive than several internally pathogenic variants within the same transmembrane domain (Fiedorczuk K et al. Cell, 2022 Jan;185:158-168.e11). In a functional study, M1137V did not affect protein maturation, but significantly reduced cAMP-activated whole cell chloride currents (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 available evidence to date, this variant is unlikely to be causative of classic cystic fibrosis; however, it likely contributes to the development of a CFTR-related disorder. Based on the majority of available evidence to date, this variant is likely to be pathogenic. -

not specified

Pathogenic:1Uncertain:1

Likely pathogenic, criteria provided, single submitter	clinical testing	Al Jalila Children’s Genomics Center, Al Jalila Childrens Speciality Hospital	Feb 23, 2020	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Apr 10, 2024	Variant summary: CFTR c.3409A>G (p.Met1137Val) results in a conservative amino acid change located in the 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 3.6e-05 in 252866 control chromosomes (gnomAD v2.1, and publication data). c.3409A>G has been reported in the literature in compound heterozygous individuals affected with cystic fibrosis (CF) who carried a pathogenic variant in trans (e.g. Clarke_2018, Iuliano_2009), but was also reported in an individual with neonatal hypertrypsinaemia, but normal sweat test, who was compound heterozygous for the variant and the delta508 allele (Castellani_2001). The variant was also found in a patient diagnosed with congenital bilateral absence of the vas deferens (CBAVD), who was a compound heterozygote with a complex allele classified as pathogenic for CFTR-related disorders by our lab (El-Seedy_2012). In addition, the variant was reported in individuals affected with CF-related- or unspecified phenotypes (e.g. Durno_2002, El-Seedy_2012, Green_2010, Bombieri_1998, Trujillano_2015, Castellani_2001, Eski_2019 [No PMID]), however without strong evidence for causality (i.e. lack of second CFTR variant and co-segregation evidence). These data indicate that the variant may be associated with disease. At least one publication reported experimental evidence evaluating an impact on protein function, and demonstrated decreased channel activity, but no visible effect on protein maturation (Vankeerberghen_1998). The following publications have been ascertained in the context of this evaluation (PMID: 7543317, 9921909, 8644755, 9804160, 22678879, 11303517, 20932301, 25910067, 12454843, 19587087, 26436105, 11845002, 30488522). ClinVar contains an entry for this variant (Variation ID: 53733). Based on the evidence outlined above, the variant was classified as VUS-possibly pathogenic. -

Bronchiectasis with or without elevated sweat chloride 1

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Baylor Genetics

Mar 27, 2024

- -

Infertility disorder

Uncertain:1

Uncertain significance, no assertion criteria provided

provider interpretation

MAGI's Lab - Research, MAGI Group

- -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

AiLife Diagnostics, AiLife Diagnostics

Mar 03, 2022

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.50

BayesDel_addAF

Pathogenic

0.32

BayesDel_noAF

Pathogenic

0.36

CADD

Uncertain

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.64

D;.;.;T;.

Eigen

Uncertain

0.58

Eigen_PC

Uncertain

0.66

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.88

D;D;D;D;D

M_CAP

Pathogenic

0.41

MetaRNN

Pathogenic

0.96

D;D;D;D;D

MetaSVM

Uncertain

0.51

MutationAssessor

Benign

1.8

L;.;.;.;.

MutationTaster

Benign

1.0

D;D

PrimateAI

Uncertain

0.68

PROVEAN

Benign

-1.5

N;.;.;N;.

REVEL

Pathogenic

0.76

Sift

Uncertain

0.0050

D;.;.;D;.

Sift4G

Uncertain

0.013

D;.;.;D;.

Polyphen

0.61

P;.;.;.;.

Vest4

0.94

MutPred

0.91

Gain of helix (P = 0.2294);.;.;.;.;

MVP

1.0

MPC

0.0055

ClinPred

0.33

GERP RS

5.9

Varity_R

0.78

gMVP

0.92

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

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