rs397508225

Positions:

• chr7-117559609-A-G

Variant summary

Our verdict is Pathogenic. Variant got 16 ACMG points: 16P and 0B. PM1 PM2 PP3_Strong PP5_Very_Strong

The NM_000492.4(CFTR):​c.1538A>G​(p.Asp513Gly) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000089 in 1,461,128 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 (★★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000089 (0 hom.)
• Consequence: CFTR NM_000492.4 missense
• Clinical Significance: Pathogenic reviewed by expert panel P:4 U:1 O:1
• Conservation: PhyloP100: 8.79

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-AS1 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 16 ACMG points.

• PM1: In a domain ABC transporter 1 (size 223) in uniprot entity CFTR_HUMAN there are 54 pathogenic changes around while only 9 benign (86%) in NM_000492.4
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.973
• PP5: Variant 7-117559609-A-G is Pathogenic according to our data. Variant chr7-117559609-A-G is described in ClinVar as [Pathogenic]. Clinvar id is 53280.Status of the report is reviewed_by_expert_panel, 3 stars. Variant chr7-117559609-A-G is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CFTR	NM_000492.4	c.1538A>G	p.Asp513Gly	missense_variant	11/27	ENST00000003084.11	NP_000483.3
CFTR-AS1	NR_149084.1	n.221+1124T>C		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CFTR	ENST00000003084.11	c.1538A>G	p.Asp513Gly	missense_variant	11/27	1	NM_000492.4	ENSP00000003084.6

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000398 AC: 1 AN: 251190 Hom.: 0 AF XY: 0.00000737 AC XY: 1 AN XY: 135776

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: 0.00000880

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000890 AC: 13 AN: 1461128 Hom.: 0 Cov.: 30 AF XY: 0.00000825 AC XY: 6 AN XY: 726902

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: 0.0000117

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000624 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:4 Uncertain:1 Other:1

Revision: reviewed by expert panel

Submissions by phenotype

Cystic fibrosis Pathogenic:2 Uncertain:1 Other:1

not provided, no classification provided	literature only	ClinVar Staff, National Center for Biotechnology Information (NCBI)	-	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Ambry Genetics	Sep 24, 2015	The p.D513G variant (also known as c.1538A>G and 1670A>G), located in coding exon 11 of the CFTR gene, results from an A to G substitution at nucleotide position 1538. The aspartic acid at codon 513 is replaced by glycine, an amino acid with similar properties. This alteration was first reported in an individual with CBAVD, elevated sweat chloride, pancreatic sufficiency, and normal lung function, who reportedly carried deltaF508 on the other chromosome (Bienvenu T et al. Cystic Fibrosis Mutation Database [database online]. Toronto, ON, Canada: SickKids; 1998). This variant has been detected in conjunction with a pathogenic mutation in CFTR in four patients tested by our laboratory; it was confirmed to be in trans with the pathogenic mutation in one patient. This variant was not reported in population based cohorts in the following databases: Database of Single Nucleotide Polymorphisms (dbSNP), NHLBI Exome Sequencing Project (ESP), and 1000 Genomes Project. In the ESP, this variant was not observed in 6503 samples (13006 alleles) with coverage at this position. This amino acid position is highly conserved on sequence alignment. In addition, this alteration is predicted to be deleterious by in silico analysis. Based on the majority of available evidence to date, this variant is likely to be pathogenic. -
Pathogenic, reviewed by expert panel	research	CFTR2	Dec 08, 2017	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Apr 19, 2022	This sequence change replaces aspartic acid, which is acidic and polar, with glycine, which is neutral and non-polar, at codon 513 of the CFTR protein (p.Asp513Gly). This variant is present in population databases (rs397508225, gnomAD 0.0009%). This missense change has been observed in individual(s) with cystic fibrosis (PMID: 10651488, 23974870, 33572515). ClinVar contains an entry for this variant (Variation ID: 53280). 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 C35"). Experimental studies have shown that this missense change affects CFTR function (PMID: 29805046). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site. 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. -

Bronchiectasis with or without elevated sweat chloride 1 Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Baylor Genetics

Mar 04, 2024

- -

Cystic fibrosis;C5924204:CFTR-related disorder Pathogenic:1

Pathogenic, criteria provided, single submitter

curation

CFTR-France

Mar 09, 2018

the variant causes a phenotype but regarding our data, we can't formally attribute it to CF, CFTR-RD or both -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.88
BayesDel_addAF	Pathogenic	0.43	D
BayesDel_noAF	Pathogenic	0.38
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.92	D;.;.;D;.
Eigen	Pathogenic	0.79
Eigen_PC	Pathogenic	0.76
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.97	D;D;D;D;D
M_CAP	Pathogenic	0.73	D
MetaRNN	Pathogenic	0.97	D;D;D;D;D
MetaSVM	Pathogenic	0.83	D
MutationAssessor	Uncertain	2.0	M;.;.;.;.
PrimateAI	Uncertain	0.68	T
PROVEAN	Pathogenic	-4.8	D;.;.;D;.
REVEL	Pathogenic	0.96
Sift	Uncertain	0.010	D;.;.;D;.
Sift4G	Uncertain	0.019	D;.;.;D;.
Polyphen		1.0	D;.;.;.;.
Vest4		0.98
MutPred		0.85		Gain of methylation at R516 (P = 0.1308);.;.;.;.;
MVP		1.0
MPC		0.0052
ClinPred		0.99	D
GERP RS		5.5
Varity_R		0.94
gMVP		0.98

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

Other links and lift over

dbSNP: rs397508225; hg19: chr7-117199663;