Is RUNX1 p.Arg427= (c.1281C>A) pathogenic?

RUNX1 p.Arg427= (c.1281C>A) is classified Likely benign in RUNX1 (ClinVar, Expert panel, 3 submitters; last evaluated 2024-09-10). No allele count reported in gnomAD v4.1 (AN 1,542,354); Associated with hereditary thrombocytopenia and hematologic cancer predisposition syndrome.

What condition is associated with RUNX1 p.Arg427= (c.1281C>A)?

RUNX1 p.Arg427= (c.1281C>A) is associated with hereditary thrombocytopenia and hematologic cancer predisposition syndrome, hereditary thrombocytopenia and hematological cancer predisposition syndrome associated with RUNX1 (ClinVar).

How common is RUNX1 p.Arg427= (c.1281C>A) in the general population?

RUNX1 p.Arg427= (c.1281C>A) is no allele count reported in gnomAD v4.1 (AN 1,542,354) (gnomAD).

RUNX1 p.Arg427=

Q: How is Familial platelet disorder with associated myeloid malignancy inherited?

Typically Autosomal dominant (Orphanet). A genetic counselor can assess individual risk for a family.

c.1281C>A · rs2145874067 · VCV2132477

Likely benign Expert panel

Classification

Likely benign

ClinVar

Review

Expert panel ★★★☆

ClinVar · 3 submitters

gnomAD v4.1

Not reported

no allele count reported in gnomAD v4.1 (AN 1,542,354)

Conditions

hereditary thrombocytopenia and hematologic cancer predisposition syndrome

ClinGen expert panel — Myeloid Malignancy VCEP

Likely Benign for hereditary thrombocytopenia and hematologic cancer predisposition syndrome. Applied ACMG criteria (verbatim):

PM2_Supporting BP7 BP4

Curation rationale (ClinGen, verbatim)

NM_001754.5(RUNX1):c.1281C>A (p.Arg427=) is a synonymous variant which has a SpliceAI score ≤ 0.20 (0.0) (BP4). This variant has a SpliceAI score ≤ 0.20 (0.0) and evolutionary conservation algorithms predict the site as not being conserved (PhyloP score ≤ 2.0 (0.25)) (BP7). This variant 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 benign. ACMG/AMP criteria applied, as specified by the Myeloid Malignancy Variant Curation Expert Panel for RUNX1: BP4, BP7, PM2_supporting.

ClinGen Evidence Repository → · reported verbatim, not re-tallied by Sugi Variant.

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 2	GERP -3.8, phastCons 1
Overall
CADD	8.821	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

No allele count reported in gnomAD v4.1 (AN 1,542,354). This is missing data, not an absence: the variant may or may not be present in gnomAD. Rarity (ACMG PM2) and BA1/BS1 cannot be assessed for it.

Variant & gene context

Gene: RUNX1
Protein: p.Arg427=
Coding: c.1281C>A
MANE Select: NM_001754
dbSNP: rs2145874067
Type: single nucleotide variant
Location: chr21:34792297 (GRCh38)
Gene constraint: LOEUF 0.633 · pLI 0.29 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 61.76 · 5 PDB
Residue 427: the 'disordered' region

Full RUNX1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

hereditary thrombocytopenia and hematologic cancer predisposition syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: hereditary thrombocytopenia and hematological cancer predisposition syndrome associated with RUNX1

For Familial platelet disorder with associated myeloid malignancy (Orphanet):

Inheritance: Autosomal dominant

Similar variants

RUNX1 p.Arg427Cys Uncertain significance ★★★ same residue
RUNX1 p.Arg427Leu Uncertain significance ★★★ ⚠ same residue
RUNX1 p.Arg427Pro Uncertain significance ★★★ ⚠ same residue
RUNX1 p.Arg427fs Likely pathogenic ★★★ same residue
RUNX1 p.Arg427Ser Uncertain significance ★ ⚠ same residue
RUNX1 c.351+1G>A Pathogenic ★★★ same condition
RUNX1 c.351+1G>C Likely pathogenic ★★★ same condition
RUNX1 c.351+1G>T Pathogenic ★★★ same condition

Built on 18 open, versioned datasets — ClinVar, gnomAD, AlphaMissense, REVEL, ClinGen & more — plus Sugi Variant's own cross-source analysis. Source data 2026-01–2026-10, ClinVar 2026-10. Full sources & versions →

Cite Sugi Variant

Gür T. Sugi Variant: A Deterministic Per-Variant Germline Reference from a Knowledge Graph for Humans and AI Agents. 2026. doi:10.5281/zenodo.21509445. This variant: https://sugi.bio/variant/runx1-p-arg427 (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown