chr12-56076841-C-G

Variant names:

• chr12-56076841-C-G
• rs11171739
• ENST00000643266.1:c.-138C>G

GermlineCancer (beta)

Variant summary

Our verdict is Uncertain significance.

+2 Uncertain · Warm

-7

-6

-1

0

+5

+6

+9

+10

BenignB

Likely BenignLB

UncertainVUS

Likely PathogenicLP

PathogenicP

The variant received 2 classification points (ACGS-UK Somatic Oncogenicity v2025). O3_Moderate

The ENST00000643266.1(ERBB3):c.-138C>G variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. Note: ENST00000643266.1 is not a MANE Select or MANE Plus Clinical transcript for ERBB3; the reported annotation may differ from that of the MANE-designated reference transcript for this gene. The gene ERBB3 is a known oncogene (CancerMine: 52 oncogene, 29 driver citations). The gene ERBB3 is a cancer driver gene (CancerMine: 52 oncogene, 29 driver citations). The variant is absent from the gnomAD population database at sites with sufficient sequencing coverage. In-silico predictor (BayesDel (noAF)) classifies this variant as likely benign. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: not found (cov: 26)
• Consequence: ERBB3 ENST00000643266.1 5_prime_UTR
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.0710
• Publications: 156 publications found

Genes affected

ERBB3 (HGNC:3431): (erb-b2 receptor tyrosine kinase 3) This gene encodes a member of the epidermal growth factor receptor (EGFR) family of receptor tyrosine kinases. This membrane-bound protein has a neuregulin binding domain but not an active kinase domain. It therefore can bind this ligand but not convey the signal into the cell through protein phosphorylation. However, it does form heterodimers with other EGF receptor family members which do have kinase activity. Heterodimerization leads to the activation of pathways which lead to cell proliferation or differentiation. Amplification of this gene and/or overexpression of its protein have been reported in numerous cancers, including prostate, bladder, and breast tumors. Alternate transcriptional splice variants encoding different isoforms have been characterized. One isoform lacks the intermembrane region and is secreted outside the cell. This form acts to modulate the activity of the membrane-bound form. Additional splice variants have also been reported, but they have not been thoroughly characterized. [provided by RefSeq, Jul 2008]

ERBB3 Gene-Disease associations (from GenCC):

• lethal congenital contracture syndrome 2

  Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, Orphanet, G2P
• visceral neuropathy, familial, 1, autosomal recessive

  Inheritance: AR Classification: STRONG Submitted by: PanelApp Australia, G2P
• Hirschsprung disease

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

Classification according to ACGS-UK Somatic Oncogenicity v2025

Classification was made for transcript:

Our verdict: Uncertain_significance. The variant received 2 points.

Apply	Criterion Code & Title / Strength	Strength	Rationale / Clinical Context
	O3Absent or very rare in population		Absent or extremely rare in gnomAD (AC ≤ 2) — O3 moderate; GnomAD: AF = absent, AC = 0 — absent/extremely rare (O3 moderate [+2])

Variant Effect in Transcripts

Automated classification analysis was done for transcript: ENST00000643266.1. You can select a different transcript below to see updated classification assignments.

RefSeq Transcripts

There are no transcript annotations for this variant.

Ensembl Transcripts

Sel.	Gene / Transcript	Tags	HGVSc / HGVSp	Effect	Exon rank	Protein / UniProt
	ERBB3 ENST00000643266.1		c.-138C>G	5_prime_UTR	Exon 1 of 2	Prot: ENSP00000495453.1 UniProt:
	ERBB3 ENST00000643518.1		n.-71C>G	upstream_gene	N/A	Prot:

ERBB3 ENST00000643266.1

HGVSc / HGVSpc.-138C>G

Exon rankExon 1 of 2

5_prime_UTR

Prot: ENSP00000495453.1UniProt: A0A2R8Y6T4

ERBB3 ENST00000643518.1

HGVSc / HGVSpn.-71C>G

Exon rankN/A

upstream_gene

Prot:

Frequencies

Allele frequencies (AF), counts (AC/AN), homozygotes and coverage

Common (AF > 0.05 / Hom > 5)

Rare (AF ≤ 0.0001 / Hom ≤ 1)

Source / population	AF	AC	Hom	AN	Coverage
Global population databases 3 sources Large-scale international reference populations
GnomAD3 genomes	AF:	AC:	Hom:	AN:	Cov:26
GnomAD4 exome	AF:	AC:	Hom:	AN:	Cov:0
GnomAD4 genome	AF:	AC:	Hom:	AN:	Cov:26

Showing 3 sources

ClinVar

Not reported in ClinVar

Computational Scores

Algorithm	Calibrated pred.	Score	Prediction
AlphaGenome AVI	Benign	3.7
BayesDel_noAF	Benign	-0.89
CADD	Benign	6.6
DANN	Benign	0.55
GPN-Star LLR	N/A	-0.50
GPN-Star score	N/A	0.50
PhyloP100	Benign	0.071
PromoterAI	N/A	-0.010	Neutral

Showing 8 of 8 scores

Splicing Scores

Algorithm	Calibrated pred.	Score	Prediction
Pangolin (max)	Benign	0.0

Showing 1 of 1 scores

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

MaveDB functional evidence

MaveDB is a public repository of laboratory assays that test the effect of thousands of variants at once — treat this as supporting research data and interpret it with great caution; it is not a clinical classification.

No MaveDB functional evidence found for this variant.

Other links and lift over

dbSNP: rs11171739;

hg19: chr12-56470625;

ACMG debug oncogenicity

ACGS debug oncogenicity

ACMG debug germline

Submit to ClinVar