rs121912499

chr21-34799407-G-Cchr21-34799407-G-Achr21-34799407-G-T

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PVS1_Strong PM2 PP5_Very_Strong

The NM_001754.5(RUNX1):c.861C>G(p.Tyr287Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★★). Synonymous variant affecting the same amino acid position (i.e. Y287Y) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: RUNX1 NM_001754.5 stop_gained
• Clinical Significance: Pathogenic reviewed by expert panel P:2
• Conservation: PhyloP100: 3.07

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]

ACMG classification

Verdict is Pathogenic. Variant got 14 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant is located in the 3'-most 50 bp of the penultimate exon, not predicted to undergo nonsense mediated mRNA decay. There are 19 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 21-34799407-G-C is Pathogenic according to our data. Variant chr21-34799407-G-C is described in ClinVar as [Pathogenic]. Clinvar id is 627152.Status of the report is reviewed_by_expert_panel, 3 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
RUNX1	NM_001754.5	c.861C>G	p.Tyr287Ter	stop_gained	8/9	ENST00000675419.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
RUNX1	ENST00000675419.1	c.861C>G	p.Tyr287Ter	stop_gained	8/9		NM_001754.5	A1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: reviewed by expert panel

Submissions by phenotype

Hereditary thrombocytopenia and hematologic cancer predisposition syndrome Pathogenic:1

Pathogenic, reviewed by expert panel

curation

ClinGen Myeloid Malignancy Variant Curation Expert Panel

Dec 09, 2023

NM_001754.5(RUNX1):c.861C>G (p.Tyr287Ter) is a nonsense variant which affects all biologically relevant isoforms. This variant is a nonsense variant between c.98 - c.916, ranking at PVS1 according to the RUNX1 decision tree (PVS1). This variant was found to co-segregate with disease in 3 affected family members (PMID: 11830488, Pedigree 3) (PP1). This variant is completely absent from all population databases with at least 20x coverage for RUNX1 (PM2_supporting). This variant is a nonsense/frameshift variants that is downstream of c.98 (PM5_Supporting). In summary, this variant meets criteria to be classified as pathogenic. ACMG/AMP criteria applied, as specified by the Myeloid Malignancy Variant Curation Expert Panel for RUNX1: PVS1, PP1, PM2_supporting, PM5_supporting. -

Thrombocytopenia Pathogenic:1

Likely pathogenic, criteria provided, single submitter

research

NIHR Bioresource Rare Diseases, University of Cambridge

Feb 01, 2019

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.63	D
BayesDel_noAF	Pathogenic	0.63
Cadd	Pathogenic	36
Dann	Uncertain	1.0
Eigen	Pathogenic	0.87
Eigen_PC	Pathogenic	0.76
FATHMM_MKL	Uncertain	0.97	D
MutationTaster	Benign	1.0	A;A;A;A;A
Vest4		0.95
GERP RS		5.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

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

Publications

LitVar

Other links and lift over

dbSNP: rs121912499; hg19: chr21-36171704; COSMIC: COSV55888341;