rs1554350382

Variant names:

• chr7-55181318-A-AGTC
• rs1554350382
• NM_005228.5:c.2309_2310insGTC

Variant summary

Our verdict is Likely pathogenic. The variant received 7 ACMG points: 7P and 0B. PM1 PM2 PM4_Supporting PP5_Moderate

The NM_005228.5(EGFR):​c.2309_2310insGTC​(p.Asp770delinsGluSer) variant causes a disruptive inframe insertion change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Likely pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. D770D) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 34)
• Consequence: EGFR NM_005228.5 disruptive_inframe_insertion
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 1.44
• Publications: 0 publications found

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]

EGFR-AS1 (HGNC:40207): (EGFR antisense RNA 1)

ACMG classification

Our verdict: Likely_pathogenic. The variant received 7 ACMG points.

• PM1: In a hotspot region, there are 7 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 2 benign, 23 uncertain in NM_005228.5
• PM2: Very rare variant in population databases, with high coverage
• PM4: Nonframeshift variant in NON repetitive region in NM_005228.5. Strenght limited to Supporting due to length of the change: 1aa.
• PP5: Variant 7-55181318-A-AGTC is Pathogenic according to our data. Variant chr7-55181318-A-AGTC is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 496810.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
EGFR	NM_005228.5	c.2309_2310insGTC	p.Asp770delinsGluSer	disruptive_inframe_insertion	Exon 20 of 28	ENST00000275493.7	NP_005219.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
EGFR	ENST00000275493.7	c.2309_2310insGTC	p.Asp770delinsGluSer	disruptive_inframe_insertion	Exon 20 of 28	1	NM_005228.5	ENSP00000275493.2

Frequencies

GnomAD3 genomes Cov.: 34

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 34

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Lung adenocarcinoma Pathogenic:1

Dec 12, 2017

Molecular Diagnostics, Rajiv Gandhi Cancer Institute & Research Center

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In-frame insertion of 'GTC' in exon 20 of EGFR is a negative predictor of drug response to anti EGFR TKIs. This inference is being drawn based upon similar insertions in this region of exon 20. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		1.4
Mutation Taster		=22/178	disease causing (ClinVar)

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs1554350382; hg19: chr7-55249011;