7-117536646-T-C

Position:

chr7-117536646-T-C

Variant summary

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

The NM_000492.4(CFTR):c.842T>C(p.Met281Thr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000136 in 1,611,748 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 0.000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000082 ( 0 hom. )

Consequence

CFTR
NM_000492.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:7O:1

Conservation

PhyloP100: 7.54

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 8 ACMG points.

PM1

In a domain ABC transmembrane type-1 1 (size 284) in uniprot entity CFTR_HUMAN there are 65 pathogenic changes around while only 10 benign (87%) in NM_000492.4

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.974

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CFTR	NM_000492.4 linkuse as main transcript	c.842T>C	p.Met281Thr	missense_variant	7/27	ENST00000003084.11	NP_000483.3	P13569-1A0A024R730

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CFTR	ENST00000003084.11 linkuse as main transcript	c.842T>C	p.Met281Thr	missense_variant	7/27	1	NM_000492.4	ENSP00000003084.6		P13569-1

Frequencies

GnomAD3 genomes

AF:

0.0000657

AC:

AN:

152138

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000524

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:

0.000479

GnomAD3 exomes

AF:

0.00000802

AC:

AN:

249438

Hom.:

AF XY:

0.0000148

AC XY:

AN XY:

134942

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:

0.00000884

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000822

AC:

AN:

1459610

Hom.:

Cov.:

AF XY:

0.00000551

AC XY:

AN XY:

726148

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.0000672

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:

0.00000540

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.0000657

AC:

AN:

152138

Hom.:

Cov.:

AF XY:

0.0000538

AC XY:

AN XY:

74316

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.000524

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:

0.000479

Alfa

AF:

0.0000688

Hom.:

Bravo

AF:

0.000147

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:7Other:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Cystic fibrosis

Uncertain:4Other:1

Uncertain significance, criteria provided, single submitter	clinical testing	Counsyl	Jul 25, 2017	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Sep 05, 2021	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Ambry Genetics	Oct 11, 2022	The p.M281T variant (also known as c.842T>C and c.974T>C) is located in coding exon 7 of the CFTR gene. This variant results from a T to C substitution at nucleotide position 842. The methionine at codon 281 is replaced by threonine, an amino acid with similar properties. This variant was described in an individual with pancreatitis, sweat chloride levels of 62 mmol/L, pancreatic sufficiency, and normal respiratory function; another pathogenic variant was not described (Casals et al. Pancreas 2004 May;28(4):374-9). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -
not provided, no classification provided	literature only	ClinVar Staff, National Center for Biotechnology Information (NCBI)	-	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jul 04, 2022	This sequence change replaces methionine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 281 of the CFTR protein (p.Met281Thr). This variant is present in population databases (rs397508802, gnomAD 0.004%). This missense change has been observed in individual(s) with chronic pancreatitis (PMID: 15097853). ClinVar contains an entry for this variant (Variation ID: 54067). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C15"). 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 specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

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

Jun 06, 2024

Variant summary: CFTR c.842T>C (p.Met281Thr) results in a non-conservative amino acid change located in the ABC transporter type 1, transmembrane domain (IPR011527) of the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 8e-06 in 249438 control chromosomes. The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance.c.842T>C has been reported in the literature as a non-informative genotype (second allele not specified) in a pancreatically sufficient individual with intermediate sweat chloride levels who presented with chronic pancreatitis (example, Casals_2004 cited in deCid_2010). These report(s) do not provide unequivocal conclusions about association of the variant with Cystic Fibrosis. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 15097853, 26471113, 19812525). ClinVar contains an entry for this variant (Variation ID: 54067). Based on the evidence outlined above, the variant was classified as uncertain significance. -

CFTR-related disorder

Uncertain:1

Uncertain significance, no assertion criteria provided

clinical testing

Natera, Inc.

May 11, 2018

- -

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

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Jan 12, 2022

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.44

BayesDel_addAF

Pathogenic

0.36

BayesDel_noAF

Pathogenic

0.37

CADD

Uncertain

DANN

Uncertain

0.99

DEOGEN2

Pathogenic

0.87

D;.;.;D;.

Eigen

Uncertain

0.36

Eigen_PC

Uncertain

0.45

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Benign

0.82

T;T;T;T;T

M_CAP

Pathogenic

0.57

MetaRNN

Pathogenic

0.97

D;D;D;D;D

MetaSVM

Uncertain

0.48

MutationAssessor

Benign

1.9

M;.;.;.;M

PrimateAI

Uncertain

0.68

PROVEAN

Uncertain

-3.2

D;.;.;D;.

REVEL

Pathogenic

0.88

Sift

Uncertain

0.0010

D;.;.;D;.

Sift4G

Pathogenic

0.0

D;.;.;D;.

Polyphen

0.29

B;.;.;.;.

Vest4

0.96

MutPred

0.93

Gain of ubiquitination at K283 (P = 0.0743);Gain of ubiquitination at K283 (P = 0.0743);Gain of ubiquitination at K283 (P = 0.0743);.;Gain of ubiquitination at K283 (P = 0.0743);

MVP

1.0

MPC

0.0040

ClinPred

0.96

GERP RS

5.1

Varity_R

0.92

gMVP

0.97

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

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