rs397508498

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PM1PM2PM5PP3_StrongPP5_Very_Strong

The NM_000492.4(CFTR):c.3107C>A(p.Thr1036Asn) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000186 in 1,613,434 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 Pathogenic (★★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. T1036I) has been classified as Likely pathogenic.

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 31)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

CFTR
NM_000492.4 missense

Scores

Clinical Significance

Pathogenic reviewed by expert panel P:8O:1

Conservation

PhyloP100: 7.52

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 Pathogenic. Variant got 18 ACMG points.

PM1

In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 12 uncertain in NM_000492.4

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr7-117610636-A-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 2577297.Status of the report is criteria_provided_single_submitter, 1 stars.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.965

PP5

Variant 7-117610637-C-A is Pathogenic according to our data. Variant chr7-117610637-C-A is described in ClinVar as [Pathogenic]. Clinvar id is 53652.Status of the report is reviewed_by_expert_panel, 3 stars. Variant chr7-117610637-C-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CFTR	NM_000492.4 linkuse as main transcript	c.3107C>A	p.Thr1036Asn	missense_variant	19/27	ENST00000003084.11

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CFTR	ENST00000003084.11 linkuse as main transcript	c.3107C>A	p.Thr1036Asn	missense_variant	19/27	1	NM_000492.4	P2	P13569-1
	ENST00000456270.1 linkuse as main transcript	n.177+5592G>T		intron_variant, non_coding_transcript_variant		3

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152098

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.0000943

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000398

AC:

AN:

250950

Hom.:

AF XY:

0.00

AC XY:

AN XY:

135624

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:

6.84e-7

AC:

AN:

1461336

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

726962

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:

0.0000131

AC:

AN:

152098

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74286

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.0000655

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.0000943

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000113

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:8Other:1

Revision: reviewed by expert panel

LINK: link

Submissions by phenotype

Cystic fibrosis

Pathogenic:5Other:1

Likely pathogenic, criteria provided, single submitter	clinical testing	Ambry Genetics	Oct 15, 2021	The p.T1036N variant (also known as c.3107C>A), located in coding exon 19 of the CFTR gene, results from a C to A substitution at nucleotide position 3107. The threonine at codon 1036 is replaced by asparagine, an amino acid with similar properties. This variant was reported in a homozygous individual with a classic presentation of cystic fibrosis (McGinniss MJ et al. Hum Genet, 2005 Dec;118:331-8). This variant was also reported in trans with p.F508del mutation in an individual with classic cystic fibrosis (Petrova NV et al. Genes (Basel), 2020 05;11:). Additionally, this variant has been reported in multiple individuals with an elevated sweat chloride level in The Clinical and Functional TRanslation of CFTR (CFTR2) database (available at http://cftr2.org. Accessed 10/14/2021). This amino acid position is highly conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. Based on the majority of available evidence to date, this variant is likely to be pathogenic. -
Pathogenic, reviewed by expert panel	research	CFTR2	Mar 11, 2019	- -
Pathogenic, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Oct 25, 2022	Variant summary: CFTR c.3107C>A (p.Thr1036Asn) results in a non-conservative amino acid change located in the ABC transporter type 1, transmembrane domain 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 4e-06 in 250950 control chromosomes. c.3107C>A has been reported in the literature as a biallelic compound heterozygous or homozygous genotype in multiple individuals affected with Cystic Fibrosis (example, Giusti_2007, McGinniss_2005, Salinas_2016). These data indicate that the variant is very likely to be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Four clinical diagnostic laboratories and an expert panel (CFTR2) have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All submitters classified the variant as pathogenic/likely pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -
Likely pathogenic, criteria provided, single submitter	curation	Institute of Human Genetics, University of Leipzig Medical Center	Sep 05, 2022	This variant was identified in 1 patient with a clinically confirmed diagnosis of cystic fibrosis. The variant was classified in the context of a project re-classifying variants in the German Cystic Fibrosis Registry (Muko.e.V.). Link: https://www.muko.info/angebote/qualitaetsmanagement/register/cf-einrichtungen/mukoweb. Criteria applied: PM2_SUP, PM3_STR, PM5, PP3 -
not provided, no classification provided	literature only	ClinVar Staff, National Center for Biotechnology Information (NCBI)	-	- -
Pathogenic, criteria provided, single submitter	clinical testing	Invitae	Jul 16, 2023	Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on CFTR protein function. This variant disrupts the p.Thr1036 amino acid residue in CFTR. Other variant(s) that disrupt this residue have been observed in individuals with CFTR-related conditions (PMID: 17662673), which suggests that this may be a clinically significant amino acid residue. For these reasons, this variant has been classified as Pathogenic. This sequence change replaces threonine, which is neutral and polar, with asparagine, which is neutral and polar, at codon 1036 of the CFTR protein (p.Thr1036Asn). This variant is present in population databases (rs397508498, gnomAD 0.004%). This missense change has been observed in individual(s) with cystic fibrosis (PMID: 16189704, 27214204, 32429104). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. ClinVar contains an entry for this variant (Variation ID: 53652). -

not specified

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Feb 21, 2019

The CFTR c.3107C>A; p.Thr1036Asn variant (rs397508498) is reported in the literature in individuals affected with either pancreatic-sufficient or pancreatic-insufficient cystic fibrosis (CF) (Chavez-Saldana 2010, McGinniss 2005, Salinas 2016). This variant has been identified in affected individuals both in the homozygous state (McGinniss 2005) and in heterozygous individuals with an additional pathogenic variant (Salinas 2016). This variant is found on only two chromosomes in the Genome Aggregation Database, indicating it is not a common polymorphism. The threonine at codon 1036 is highly conserved and computational analyses (SIFT, PolyPhen-2) predict that this variant is deleterious. Additionally, another variant at the same codon (p.Thr1036Ile) has been reported in individuals with CF and is considered pathogenic (Alibakhshi 2008, Sahami 2014). Based on available information, the p.Thr1036Asn variant is considered to be likely pathogenic. References: Alibakhshi R et al. Analysis of the CFTR gene in Iranian cystic fibrosis patients: identification of eight novel mutations. J Cyst Fibros. 2008 Mar;7(2):102-9. Chavez-Saldana M et al. CFTR allelic heterogeneity in Mexican patients with cystic fibrosis: implications for molecular screening. Rev Invest Clin. 2010 Nov-Dec;62(6):546-52. McGinniss MJ et al. Extensive sequencing of the CFTR gene: lessons learned from the first 157 patient samples. Hum Genet. 2005 Dec;118(3-4):331-8. Sahami A et al. Mutation Analysis of Exons 10 and 17a of CFTR Gene in Patients with Cystic Fibrosis in Kermanshah Province, Western Iran. J Reprod Infertil. 2014 Jan;15(1):49-56. Salinas DB et al. Benign and Deleterious Cystic Fibrosis Transmembrane Conductance Regulator Mutations Identified by Sequencing in Positive Cystic Fibrosis Newborn Screen Children from California. PLoS One. 2016 May 23;11(5):e0155624. -

Cystic fibrosis;C0403814:Congenital bilateral aplasia of vas deferens from CFTR mutation

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Baylor Genetics

- -

not provided

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Mayo Clinic Laboratories, Mayo Clinic

Sep 02, 2021

PM2, PM3_strong -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.77

BayesDel_addAF

Uncertain

0.15

BayesDel_noAF

Uncertain

0.060

Cadd

Pathogenic

Dann

Uncertain

0.99

DEOGEN2

Pathogenic

0.87

D;.;.;D;.

Eigen

Pathogenic

0.98

Eigen_PC

Pathogenic

0.91

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Pathogenic

0.98

D;D;D;D;D

M_CAP

Pathogenic

0.70

MetaRNN

Pathogenic

0.96

D;D;D;D;D

MetaSVM

Pathogenic

0.92

MutationAssessor

Pathogenic

3.7

H;.;.;.;.

MutationTaster

Benign

1.0

D;D

PrimateAI

Uncertain

0.72

PROVEAN

Uncertain

-3.8

D;.;.;D;.

REVEL

Uncertain

0.62

Sift

Pathogenic

0.0

D;.;.;D;.

Sift4G

Pathogenic

0.0

D;.;.;D;.

Polyphen

1.0

D;.;.;.;.

Vest4

0.96

MutPred

0.83

Gain of relative solvent accessibility (P = 0.09);.;.;.;.;

MVP

1.0

MPC

0.015

ClinPred

1.0

GERP RS

6.2

Varity_R

0.96

gMVP

0.99

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