chr21-35048865-G-C

Variant names:

• chr21-35048865-G-C
• rs750755857
• NM_001754.5:c.35C>G

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 1P and 0B. PM2_Supporting

This summary comes from the ClinGen Evidence Repository: NM_001754.5(RUNX1):c.35C>G (p.Ser12Trp) is a missense variant which is absent from gnomAD v2, v3, and v4.1 (PM2_supporting). This variant has not been reported in the literature. The computational predictor REVEL gives a score of 0.631, which is neither above nor below the thresholds predicting a damaging or benign impact on RUNX1 function, and the splice site predictor SpliceAI indicates that the variant has no impact on splicing. In summary, this variant meets the criteria to be classified as a VUS for autosomal dominant hereditary thrombocytopenia and hematologic cancer predisposition syndrome based on the ACMG/AMP criteria applied, as specified by the ClinGen Myeloid Malignancy VCEP: PM2_supporting. LINK:https://erepo.genome.network/evrepo/ui/classification/CA410208239/MONDO:0011071/008

• Frequency: Genomes: not found (cov: 31)
• Consequence: RUNX1 NM_001754.5 missense
• Clinical Significance: Uncertain significance reviewed by expert panel U:2
• Conservation: PhyloP100: 5.59
• Publications: 0 publications found

Genes affected

RUNX1 (HGNC:10471): (RUNX family transcription factor 1) Core binding factor (CBF) is a heterodimeric transcription factor that binds to the core element of many enhancers and promoters. The protein encoded by this gene represents the alpha subunit of CBF and is thought to be involved in the development of normal hematopoiesis. Chromosomal translocations involving this gene are well-documented and have been associated with several types of leukemia. Three transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jul 2008]

RUNX1 Gene-Disease associations (from GenCC):

• hereditary thrombocytopenia and hematologic cancer predisposition syndrome

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
• hereditary thrombocytopenia and hematological cancer predisposition syndrome associated with RUNX1

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, Genomics England PanelApp, G2P, Labcorp Genetics (formerly Invitae)
• acute myeloid leukemia

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: For more information check the summary or visit ClinGen Evidence Repository.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001754.5. 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
	RUNX1	NM_001754.5	MANE Select	c.35C>G	p.Ser12Trp	missense	Exon 2 of 9	NP_001745.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	RUNX1	ENST00000675419.1	MANE Select	c.35C>G	p.Ser12Trp	missense	Exon 2 of 9	ENSP00000501943.1
	RUNX1	ENST00000300305.7	TSL:1	c.35C>G	p.Ser12Trp	missense	Exon 1 of 8	ENSP00000300305.3
	RUNX1	ENST00000416754.1	TSL:1	c.35C>G	p.Ser12Trp	missense	Exon 2 of 3	ENSP00000405158.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: reviewed by expert panel

Submissions by phenotype

Hereditary thrombocytopenia and hematologic cancer predisposition syndrome Uncertain:1

Oct 29, 2024

ClinGen Myeloid Malignancy Variant Curation Expert Panel

Significance: Uncertain significance

Review Status: reviewed by expert panel

Collection Method: curation

NM_001754.5(RUNX1):c.35C>G (p.Ser12Trp) is a missense variant which is absent from gnomAD v2, v3, and v4.1 (PM2_supporting). This variant has not been reported in the literature. The computational predictor REVEL gives a score of 0.631, which is neither above nor below the thresholds predicting a damaging or benign impact on RUNX1 function, and the splice site predictor SpliceAI indicates that the variant has no impact on splicing. In summary, this variant meets the criteria to be classified as a VUS for autosomal dominant hereditary thrombocytopenia and hematologic cancer predisposition syndrome based on the ACMG/AMP criteria applied, as specified by the ClinGen Myeloid Malignancy VCEP: PM2_supporting.

Hereditary thrombocytopenia and hematological cancer predisposition syndrome associated with RUNX1 Uncertain:1

Aug 20, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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. An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. This variant has not been reported in the literature in individuals affected with RUNX1-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces serine, which is neutral and polar, with tryptophan, which is neutral and slightly polar, at codon 12 of the RUNX1 protein (p.Ser12Trp).

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.34
BayesDel_addAF	Pathogenic	0.29	D
BayesDel_noAF	Pathogenic	0.18
CADD	Uncertain	26
DANN	Uncertain	0.99
DEOGEN2	Benign	0.23	T
Eigen	Uncertain	0.64
Eigen_PC	Uncertain	0.65
FATHMM_MKL	Uncertain	0.92	D
LIST_S2	Uncertain	0.88	D
M_CAP	Uncertain	0.18	D
MetaRNN	Uncertain	0.63	D
MetaSVM	Pathogenic	1.0	D
PhyloP100		5.6
PrimateAI	Uncertain	0.57	T
PROVEAN	Benign	-1.1	N
REVEL	Uncertain	0.63
Sift	Uncertain	0.012	D
Sift4G	Uncertain	0.015	D
Polyphen		0.99	D
Vest4		0.69
MutPred		0.35		Loss of disorder (P = 0)
MVP		0.95
MPC		1.6
ClinPred		0.99	D
GERP RS		5.4
PromoterAI		-0.23	Neutral
gMVP		0.32
Mutation Taster		=72/28	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs750755857; hg19: chr21-36421162;