21-34892926-G-T

Variant names:

• chr21-34892926-G-T
• rs748758482
• NM_001754.5:c.96C>A

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001754.5(RUNX1):​c.96C>A​(p.His32Gln) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000714 in 1,399,848 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. H32H) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 7.1e-7 (0 hom.)
• Consequence: RUNX1 NM_001754.5 missense, splice_region
• Scores: Splicing: ADA: 0.0001100
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.481
• 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 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.17396656).

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.96C>A	p.His32Gln	missense splice_region	Exon 3 of 9	NP_001745.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	RUNX1	ENST00000675419.1	MANE Select	c.96C>A	p.His32Gln	missense splice_region	Exon 3 of 9	ENSP00000501943.1
	RUNX1	ENST00000300305.7	TSL:1	c.96C>A	p.His32Gln	missense splice_region	Exon 2 of 8	ENSP00000300305.3
	RUNX1	ENST00000416754.1	TSL:1	c.96C>A	p.His32Gln	missense splice_region	Exon 3 of 3	ENSP00000405158.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 7.14e-7 AC: 1 AN: 1399848 Hom.: 0 Cov.: 25 AF XY: 0.00000143 AC XY: 1 AN XY: 699926

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.00 AC: 0 AN: 32234

American (AMR) AF: 0.00 AC: 0 AN: 44452

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25674

East Asian (EAS) AF: 0.00 AC: 0 AN: 39270

South Asian (SAS) AF: 0.00 AC: 0 AN: 84300

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53368

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5634

European-Non Finnish (NFE) AF: 9.46e-7 AC: 1 AN: 1056606

Other (OTH) AF: 0.00 AC: 0 AN: 58310

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.088
BayesDel_addAF	Benign	-0.024	T
BayesDel_noAF	Benign	-0.27
CADD	Benign	11
DANN	Benign	0.72
Eigen	Benign	-1.3
Eigen_PC	Benign	-1.3
FATHMM_MKL	Benign	0.027	N
LIST_S2	Benign	0.49	T
M_CAP	Uncertain	0.27	D
MetaRNN	Benign	0.11	T
MetaSVM	Pathogenic	0.96	D
PhyloP100		-0.48
PrimateAI	Benign	0.47	T
PROVEAN	Benign	-0.17	N
REVEL	Benign	0.26
Sift	Benign	0.22	T
Sift4G	Benign	0.30	T
Polyphen		0.14	B
Vest4		0.24
MutPred		0.15		Loss of catalytic residue at H32 (P = 0.0501)
MVP		0.86
MPC		0.64
ClinPred		0.33	T
GERP RS		-4.8
gMVP		0.20
Mutation Taster		=98/2	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.00011
dbscSNV1_RF	Benign	0.066
SpliceAI score (max)		0.10		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: rs748758482; hg19: chr21-36265223;