chr21-34834478-G-T

Position:

• chr21-34834478-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_001754.5(RUNX1):​c.737C>A​(p.Thr246Lys) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000685 in 1,460,918 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: RUNX1 NM_001754.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 7.80

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 Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.4185482).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
RUNX1	NM_001754.5	c.737C>A	p.Thr246Lys	missense_variant	7/9	ENST00000675419.1	NP_001745.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
RUNX1	ENST00000675419.1	c.737C>A	p.Thr246Lys	missense_variant	7/9		NM_001754.5	ENSP00000501943	A1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 6.85e-7 AC: 1 AN: 1460918 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 726578

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.00e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

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

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 06, 2023

This sequence change replaces threonine, which is neutral and polar, with lysine, which is basic and polar, at codon 246 of the RUNX1 protein (p.Thr246Lys). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with RUNX1-related conditions. ClinVar contains an entry for this variant (Variation ID: 1016211). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt RUNX1 protein function. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.48
BayesDel_addAF	Pathogenic	0.19	D
BayesDel_noAF	Uncertain	0.040
CADD	Pathogenic	27
DANN	Benign	0.95
DEOGEN2	Uncertain	0.65	D;.;.;.;.
Eigen	Benign	0.14
Eigen_PC	Uncertain	0.23
FATHMM_MKL	Uncertain	0.90	D
LIST_S2	Uncertain	0.91	D;D;.;D;D
M_CAP	Pathogenic	0.45	D
MetaRNN	Benign	0.42	T;T;T;T;T
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Uncertain	2.2	M;.;.;M;.
MutationTaster	Benign	0.97	D;D;D;D;D;D
PrimateAI	Uncertain	0.69	T
PROVEAN	Benign	-2.1	N;N;N;N;N
REVEL	Uncertain	0.32
Sift	Benign	0.076	T;D;D;T;T
Sift4G	Benign	0.93	T;T;T;T;.
Polyphen		0.65	P;P;P;B;.
Vest4		0.61
MutPred		0.25		Gain of methylation at T219 (P = 0.0137);.;.;Gain of methylation at T219 (P = 0.0137);.;
MVP		0.94
MPC		1.1
ClinPred		0.79	D
GERP RS		4.2
Varity_R		0.16
gMVP		0.43

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: rs555366994; hg19: chr21-36206775;