rs1235363099

Variant names:

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM1PM2PP3_Moderate

The NM_000492.4(CFTR):c.290T>C(p.Val97Ala) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000124 in 1,612,336 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 Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

CFTR
NM_000492.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 7.61

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_pathogenic. Variant got 6 ACMG points.

PM1

In a helix (size 27) in uniprot entity CFTR_HUMAN there are 7 pathogenic changes around while only 0 benign (100%) in NM_000492.4

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.88

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CFTR	NM_000492.4 link	c.290T>C	p.Val97Ala	missense_variant	Exon 4 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.290T>C	p.Val97Ala	missense_variant	Exon 4 of 27	1	NM_000492.4	ENSP00000003084.6		P13569-1

Frequencies

GnomAD3 genomes

AF:

0.00000657

AC:

AN:

152172

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000398

AC:

AN:

251024

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135656

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000290

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:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

6.85e-7

AC:

AN:

1460164

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

726514

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000224

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:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000657

AC:

AN:

152172

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74350

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000227

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jan 13, 2025

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.290T>C (p.Val97Ala) results in a non-conservative amino acid change located in the ABC transporter transmembrane region 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 251024 control chromosomes. The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. c.290T>C has been reported in the literature in at least one individual affected with Cystic Fibrosis, with presence of second variant reported, but not specified (e.g. Kharrazi_2015). These report(s) do not provide unequivocal conclusions about association of the variant with Cystic Fibrosis. One publication reports experimental evidence evaluating an impact on protein function, showing altered intrapore anion binding, however, does not allow convincing conclusions about the variant effect (e.g. Ge_2004). The following publications have been ascertained in the context of this evaluation (PMID: 15504721, 26574590). ClinVar contains an entry for this variant (Variation ID: 554723). Based on the evidence outlined above, the variant was classified as uncertain significance. -

Cystic fibrosis

Uncertain:1

Nov 02, 2017

Counsyl

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided

Uncertain:1

Aug 10, 2023

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The CFTR c.290T>C; p.Val97Ala variant (rs1235363099) is reported in the literature in an individual identified by newborn screening (Kharrazi 2015). Functional studies showed this variant does not alter single channel conductance, but may affect permeant anion binding (Ge 2004). This variant is also reported in ClinVar (Variation ID: 554723). It is only observed on two alleles in the Genome Aggregation Database, indicating it is not a common polymorphism. Computational analyses predict that this variant is deleterious (REVEL: 0.801). Due to limited information, the clinical significance of this variant is uncertain at this time. References: Ge N et al. Direct comparison of the functional roles played by different transmembrane regions in the cystic fibrosis transmembrane conductance regulator chloride channel pore. J Biol Chem. 2004 Dec 31;279(53):55283-9. PMID: 15504721. Kharrazi M et al. Newborn Screening for Cystic Fibrosis in California. Pediatrics. 2015 Dec;136(6):1062-72. Epub 2015 Nov 16. PMID: 26574590. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.54

BayesDel_addAF

Pathogenic

0.45

BayesDel_noAF

Pathogenic

0.49

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.78

.;D;.;.;T;.

Eigen

Uncertain

0.23

Eigen_PC

Uncertain

0.38

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.91

D;D;D;D;D;D

M_CAP

Pathogenic

0.39

MetaRNN

Pathogenic

0.88

D;D;D;D;D;D

MetaSVM

Pathogenic

1.1

MutationAssessor

Benign

1.6

.;L;.;.;.;L

PrimateAI

Uncertain

0.64

PROVEAN

Uncertain

-4.0

D;D;.;.;D;.

REVEL

Pathogenic

0.80

Sift

Uncertain

0.0020

D;D;.;.;D;.

Sift4G

Uncertain

0.0090

D;D;.;.;D;.

Polyphen

0.25

.;B;.;.;.;.

Vest4

0.92

MutPred

0.78

.;Loss of ubiquitination at K95 (P = 0.2094);Loss of ubiquitination at K95 (P = 0.2094);Loss of ubiquitination at K95 (P = 0.2094);Loss of ubiquitination at K95 (P = 0.2094);Loss of ubiquitination at K95 (P = 0.2094);

MVP

1.0

MPC

0.0039

ClinPred

0.82

GERP RS

5.7

Varity_R

0.63

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