7-55174776-T-G

Position:

• chr7-55174776-T-G

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM1 PM2 PP3_Moderate

The NM_005228.5(EGFR):​c.2239T>G​(p.Leu747Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. L747P) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: EGFR NM_005228.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.77

Genes affected

EGFR (HGNC:3236): (epidermal growth factor receptor) The protein encoded by this gene is a transmembrane glycoprotein that is a member of the protein kinase superfamily. This protein is a receptor for members of the epidermal growth factor family. EGFR is a cell surface protein that binds to epidermal growth factor, thus inducing receptor dimerization and tyrosine autophosphorylation leading to cell proliferation. Mutations in this gene are associated with lung cancer. EGFR is a component of the cytokine storm which contributes to a severe form of Coronavirus Disease 2019 (COVID-19) resulting from infection with severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2). [provided by RefSeq, Jul 2020]

ACMG classification

Verdict is Likely_pathogenic. Variant got 6 ACMG points.

• PM1: In a hotspot region, there are 7 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 14 uncertain in NM_005228.5
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.864

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
EGFR	NM_005228.5	c.2239T>G	p.Leu747Val	missense_variant	19/28	ENST00000275493.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
EGFR	ENST00000275493.7	c.2239T>G	p.Leu747Val	missense_variant	19/28	1	NM_005228.5	P1
EGFR	ENST00000455089.5	c.2104T>G	p.Leu702Val	missense_variant	18/26	1
EGFR	ENST00000450046.2	c.2080T>G	p.Leu694Val	missense_variant	19/28	4
EGFR	ENST00000700145.1	c.589T>G	p.Leu197Val	missense_variant	6/9

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

EGFR-related lung cancer Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Sep 29, 2019

This variant has not been reported in the literature in individuals with EGFR-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces leucine with valine at codon 747 of the EGFR protein (p.Leu747Val). The leucine residue is highly conserved and there is a small physicochemical difference between leucine and valine. 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: "Probably Damaging"; Align-GVGD: "Class C0"). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may create or strengthen a splice site, but this prediction has not been confirmed by published transcriptional studies. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.97
BayesDel_addAF	Uncertain	0.090	D
BayesDel_noAF	Benign	-0.11
CADD	Benign	22
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.58	D;D;D
Eigen	Benign	0.14
Eigen_PC	Benign	0.083
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.95	D;D;D
M_CAP	Uncertain	0.096	D
MetaRNN	Pathogenic	0.86	D;D;D
MetaSVM	Benign	-0.55	T
MutationAssessor	Benign	1.7	.;.;L
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Pathogenic	0.88	D
PROVEAN	Uncertain	-2.4	N;.;N
REVEL	Uncertain	0.39
Sift	Uncertain	0.0020	D;.;D
Sift4G	Uncertain	0.0040	D;D;D
Polyphen		0.96	D;.;D
Vest4		0.84
MutPred		0.77		.;.;Gain of methylation at K745 (P = 0.0971);
MVP		0.79
MPC		1.5
ClinPred		0.90	D
GERP RS		3.1
Varity_R		0.91
gMVP		0.54

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: rs397517095; hg19: chr7-55242469;