NM_004448.4:c.2331_2339dupGGGCTCCCC

Variant names:

• chr17-39724748-T-TGGGCTCCCC
• rs397516981
• NM_004448.4:c.2331_2339dupGGGCTCCCC

Variant summary

Our verdict is Likely pathogenic. The variant received 8 ACMG points: 8P and 0B. PM1 PM2 PM4 PP5_Moderate

The NM_004448.4(ERBB2):​c.2331_2339dupGGGCTCCCC​(p.Pro780_Tyr781insGlySerPro) 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 Pathogenic (★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: ERBB2 NM_004448.4 disruptive_inframe_insertion
• Clinical Significance: Pathogenic criteria provided, single submitter P:2 O:1
• Conservation: PhyloP100: 0.163
• Publications: 15 publications found

Genes affected

ERBB2 (HGNC:3430): (erb-b2 receptor tyrosine kinase 2) This gene encodes a member of the epidermal growth factor (EGF) receptor family of receptor tyrosine kinases. This protein has no ligand binding domain of its own and therefore cannot bind growth factors. However, it does bind tightly to other ligand-bound EGF receptor family members to form a heterodimer, stabilizing ligand binding and enhancing kinase-mediated activation of downstream signalling pathways, such as those involving mitogen-activated protein kinase and phosphatidylinositol-3 kinase. Allelic variations at amino acid positions 654 and 655 of isoform a (positions 624 and 625 of isoform b) have been reported, with the most common allele, Ile654/Ile655, shown here. Amplification and/or overexpression of this gene has been reported in numerous cancers, including breast and ovarian tumors. Alternative splicing results in several additional transcript variants, some encoding different isoforms and others that have not been fully characterized. [provided by RefSeq, Jul 2008]

ERBB2 Gene-Disease associations (from GenCC):

• Hirschsprung disease

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• lung cancer

  Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics
• glioma susceptibility 1

  Inheritance: Unknown Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)
• visceral neuropathy, familial, 2, autosomal recessive

  Inheritance: Unknown Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Likely_pathogenic. The variant received 8 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, 5 uncertain in NM_004448.4
• PM2: Very rare variant in population databases, with high coverage
• PM4: Nonframeshift variant in NON repetitive region in NM_004448.4.
• PP5: Variant 17-39724748-T-TGGGCTCCCC is Pathogenic according to our data. Variant chr17-39724748-T-TGGGCTCCCC is described in ClinVar as Pathogenic. ClinVar VariationId is 44992.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004448.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ERBB2	NM_004448.4	MANE Select	c.2331_2339dupGGGCTCCCC	p.Pro780_Tyr781insGlySerPro	disruptive_inframe_insertion	Exon 20 of 27	NP_004439.2
	ERBB2	NM_001382784.1		c.2448_2456dupGGGCTCCCC	p.Pro819_Tyr820insGlySerPro	disruptive_inframe_insertion	Exon 21 of 28	NP_001369713.1
	ERBB2	NM_001382785.1		c.2433_2441dupGGGCTCCCC	p.Pro814_Tyr815insGlySerPro	disruptive_inframe_insertion	Exon 21 of 28	NP_001369714.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ERBB2	ENST00000269571.10	TSL:1 MANE Select	c.2331_2339dupGGGCTCCCC	p.Pro780_Tyr781insGlySerPro	disruptive_inframe_insertion	Exon 20 of 27	ENSP00000269571.4
	ERBB2	ENST00000584450.5	TSL:1	c.2331_2339dupGGGCTCCCC	p.Pro780_Tyr781insGlySerPro	disruptive_inframe_insertion	Exon 20 of 26	ENSP00000463714.1
	ERBB2	ENST00000578373.5	TSL:1	n.*2121_*2129dupGGGCTCCCC		non_coding_transcript_exon	Exon 20 of 27	ENSP00000463427.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 33

GnomAD4 genome Cov.: 31

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2 Other:1

Revision: criteria provided, single submitter

Submissions by phenotype

Lung adenocarcinoma Pathogenic:1

Key Laboratory of Carcinogenesis and Cancer Invasion, Central South University

Significance: Likely pathogenic

Review Status: no assertion criteria provided

Collection Method: clinical testing

Non-small cell lung carcinoma Pathogenic:1

Jul 24, 2013

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.2331_2339dupGGGCTCCCC variant in ERBB2 has previously been identified in m ulitple lung adenocarcinomas, including one patient who had a response to an Erb B family blocker (Shigematsu 2005, Han 2006, Yamanaka 2008, Arcila 2012, De Grev e 2012). Somatic ERBB2 variants have been identified in up to 9.8% of cases of lung adenocarcinoma (Cancer Genome Project and Collaborative Group 2004).

Neoplasm Other:1

Mar 04, 2025

Center for Genomic Medicine, Rigshospitalet, Copenhagen University Hospital

Significance:

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		0.16
Mutation Taster		=44/56	disease causing (ClinVar)

Splicing

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

Other links and lift over

dbSNP: rs397516981; hg19: chr17-37881001; COSMIC: COSV54064411; COSMIC: COSV54064411;