chr21-34880665-C-T

Variant names:

• chr21-34880665-C-T
• rs74315451
• NM_001754.5:c.400G>A

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PM1 PM5 PP3 PM2_Supporting

This summary comes from the ClinGen Evidence Repository: NM_001754.5(RUNX1):c.400G>A (p.Ala134Thr) is a missense variant which affects a hotspot residue within the Runt Homology Domain (RHD): A134 (PM1). This variant is a missense change at the same residue where a different missense change has been previously established as a pathogenic variant (ClinVar ID 14468), with RNA data or agreement in splicing predictors (SSF and MES) showing no splicing effects (PM5). It has a REVEL score ≥ 0.88 (0.961) (PP3) and is completely absent from all population databases with at least 20x coverage for RUNX1 (PM2_Supporting). In summary, this variant meets criteria to be classified as likely pathogenic. ACMG/AMP criteria applied, as specified by the Myeloid Malignancy Variant Curation Expert Panel for RUNX1: PM1, PM5, PP3, PM2_Supporting. LINK:https://erepo.genome.network/evrepo/ui/classification/CA410202694/MONDO:0011071/008

• Frequency: Genomes: not found (cov: 32)
• Consequence: RUNX1 NM_001754.5 missense
• Clinical Significance: Likely pathogenic reviewed by expert panel P:2
• Conservation: PhyloP100: 7.57
• 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-AS1 (HGNC:56821): (RUNX1 antisense RNA 1)

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PM1: For more information check the summary or visit ClinGen Evidence Repository.
• PM2: For more information check the summary or visit ClinGen Evidence Repository.
• PM5: For more information check the summary or visit ClinGen Evidence Repository.
• PP3: For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
RUNX1	NM_001754.5	c.400G>A	p.Ala134Thr	missense_variant	Exon 5 of 9	ENST00000675419.1	NP_001745.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
RUNX1	ENST00000675419.1	c.400G>A	p.Ala134Thr	missense_variant	Exon 5 of 9		NM_001754.5	ENSP00000501943.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:2

Revision: reviewed by expert panel

Submissions by phenotype

not provided Pathogenic:1

Dec 01, 2024

CeGaT Center for Human Genetics Tuebingen

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

RUNX1: PM1, PM2, PM5, PP3 -

Hereditary thrombocytopenia and hematologic cancer predisposition syndrome Pathogenic:1

May 02, 2025

ClinGen Myeloid Malignancy Variant Curation Expert Panel

Significance: Likely pathogenic

Review Status: reviewed by expert panel

Collection Method: curation

NM_001754.5(RUNX1):c.400G>A (p.Ala134Thr) is a missense variant which affects a hotspot residue within the Runt Homology Domain (RHD): A134 (PM1). This variant is a missense change at the same residue where a different missense change has been previously established as a pathogenic variant (ClinVar ID 14468), with RNA data or agreement in splicing predictors (SSF and MES) showing no splicing effects (PM5). It has a REVEL score ≥ 0.88 (0.961) (PP3) and is completely absent from all population databases with at least 20x coverage for RUNX1 (PM2_Supporting). In summary, this variant meets criteria to be classified as likely pathogenic. ACMG/AMP criteria applied, as specified by the Myeloid Malignancy Variant Curation Expert Panel for RUNX1: PM1, PM5, PP3, PM2_Supporting. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.55	D
BayesDel_noAF	Pathogenic	0.56
CADD	Pathogenic	27
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	1.0	D;.;.;.;.;.;D
Eigen	Pathogenic	0.94
Eigen_PC	Pathogenic	0.88
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	1.0	D;D;.;D;D;D;D
M_CAP	Pathogenic	0.77	D
MetaRNN	Pathogenic	0.96	D;D;D;D;D;D;D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Uncertain	2.9	M;.;.;.;M;.;.
PhyloP100		7.6
PrimateAI	Pathogenic	0.88	D
PROVEAN	Uncertain	-3.7	D;D;D;D;D;D;D
REVEL	Pathogenic	0.96
Sift	Uncertain	0.0010	D;D;D;D;D;D;D
Sift4G	Pathogenic	0.0010	D;D;D;D;D;.;D
Polyphen		1.0	D;D;D;.;D;.;.
Vest4		0.96
MutPred		0.81		Gain of glycosylation at A107 (P = 0.0963);.;.;Gain of glycosylation at A107 (P = 0.0963);Gain of glycosylation at A107 (P = 0.0963);.;.;
MVP		0.98
MPC		1.6
ClinPred		1.0	D
GERP RS		5.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.88
gMVP		0.92
Mutation Taster		=12/88	disease causing

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

Other links and lift over

dbSNP: rs74315451; hg19: chr21-36252962;