NM_000492.4:c.2245C>T

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 2P and 6B. PM2BP4_StrongBP6BP7

The NM_000492.4(CFTR):c.2245C>T(p.Leu749Leu) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000743 in 1,613,358 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00057 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00076 ( 1 hom. )

Consequence

CFTR
NM_000492.4 synonymous

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:13

Conservation

PhyloP100: 2.63

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 Likely_benign. Variant got -4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.63).

BP6

Variant 7-117592412-C-T is Benign according to our data. Variant chr7-117592412-C-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 256251.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=8, Benign=1, Uncertain_significance=3}. Variant chr7-117592412-C-T is described in Lovd as [Likely_benign].

BP7

Synonymous conserved (PhyloP=2.63 with no splicing effect.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CFTR	NM_000492.4 link	c.2245C>T	p.Leu749Leu	synonymous_variant	Exon 14 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.2245C>T	p.Leu749Leu	synonymous_variant	Exon 14 of 27	1	NM_000492.4	ENSP00000003084.6		P13569-1

Frequencies

GnomAD3 genomes

AF:

0.000572

AC:

AN:

152190

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000193

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

Gnomad ASJ

AF:

0.000576

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00110

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.000611

AC:

153

AN:

250314

Hom.:

AF XY:

0.000643

AC XY:

AN XY:

135324

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000465

Gnomad ASJ exome

AF:

0.000301

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00115

Gnomad OTH exome

AF:

0.000658

GnomAD4 exome

AF:

0.000760

AC:

1111

AN:

1461050

Hom.:

Cov.:

AF XY:

0.000776

AC XY:

564

AN XY:

726814

show subpopulations

Gnomad4 AFR exome

AF:

0.0000897

Gnomad4 AMR exome

AF:

0.000403

Gnomad4 ASJ exome

AF:

0.000422

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.000169

Gnomad4 NFE exome

AF:

0.000930

Gnomad4 OTH exome

AF:

0.000563

GnomAD4 genome

AF:

0.000571

AC:

AN:

152308

Hom.:

Cov.:

AF XY:

0.000470

AC XY:

AN XY:

74472

show subpopulations

Gnomad4 AFR

AF:

0.000192

Gnomad4 AMR

AF:

0.0000654

Gnomad4 ASJ

AF:

0.000576

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00110

Gnomad4 OTH

AF:

0.000473

Alfa

AF:

0.000852

Hom.:

Bravo

AF:

0.000529

EpiCase

AF:

0.00175

EpiControl

AF:

0.00125

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:13

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2Benign:5

Apr 20, 2016

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

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: The variant affects a conserved nucleotide and results in a synonymous mutation. 5/5 in silico tools predict the variant not to have an impact on splicing while mutation taster predicts the variant to be disease causing. It was predominantly observed in the Non-Finnish European subcohort of the ExAC project at an allele frequency of 0.096% which does not exceed the maximal expected allele frequency of a disease causing CFTR allele (1.3%). It has been reported in patients with wide spectrum of CFTR-related disorders (CF, CBAVD, asthma and COPD) as well as in healthy population and often reported as polymorphism. In one CBAVD patient, this variant was found in cis with R764X (Pallares-Ruiz_1999). In addition, according to Bombieri, it does not lead to exon skipping, suggesting it is indeed not pathogenic. Considering all evidence, the variant was classified as Likely Benign. -

Aug 14, 2017

Eurofins Ntd Llc (ga)

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

May 10, 2023

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Nov 01, 2024

CeGaT Center for Human Genetics Tuebingen

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

CFTR: BP4, BP7 -

Joint Genome Diagnostic Labs from Nijmegen and Maastricht, Radboudumc and MUMC+

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Jan 30, 2023

Quest Diagnostics Nichols Institute San Juan Capistrano

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In the published literature, the variant has been reported in individuals with cystic fibrosis (CF) (PMIDs: 24782259 (2021) and 7689013 (1993)), emphysema (PMID: 9921909 (1998)), and congenital bilateral absence of the vas deferens (CBAVD) and oligoasthenoteratozoospermia (OAT) (PMID: 10601093 (1999)). Analysis of this variant using software algorithms for the prediction of the effect of nucleotide changes on splicing yielded predictions that this variant does not affect CFTR mRNA splicing . Based on the available information, we are unable to determine the clinical significance of this variant. -

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Cystic fibrosis

Benign:5

Jan 20, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jul 22, 2021

Genome-Nilou Lab

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Apr 30, 2015

Ambry Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as likely 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. -

Feb 28, 2020

Molecular Genetics Laboratory, BC Children's and BC Women's Hospitals

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Jun 11, 2020

Natera, Inc.

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

CFTR-related disorder

Uncertain:1

Apr 27, 2017

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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 did not allow this variant to be ruled in or out of causing disease. Therefore, this variant is classified as a variant of unknown significance. -

not specified

Benign:1

PreventionGenetics, part of Exact Sciences

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Obstructive azoospermia

Benign:1

Dec 21, 2021

Institute of Reproductive Genetics, University of Münster

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Hereditary pancreatitis

Benign:1

Jan 10, 2021

Sema4, Sema4

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: curation

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.63

CADD

Benign

3.1

DANN

Benign

0.44

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