Is RB1 p.Ser463= (c.1389A>G) pathogenic?

RB1 p.Ser463= (c.1389A>G) is classified Conflicting classifications of pathogenicity in RB1 (ClinVar, Conflicting submitters, 4 submitters; last evaluated 2023-11-20). Very rare (popmax 0.00017%, nfe); Associated with hereditary neoplastic syndrome.

What condition is associated with RB1 p.Ser463= (c.1389A>G)?

RB1 p.Ser463= (c.1389A>G) is associated with hereditary neoplastic syndrome, retinoblastoma (ClinVar).

How common is RB1 p.Ser463= (c.1389A>G) in the general population?

RB1 p.Ser463= (c.1389A>G) is very rare (popmax 0.00017%, nfe) (gnomAD).

RB1 p.Ser463=

c.1389A>G · rs1486168292 · VCV819083

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 4 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00017%, nfe)

Conditions

hereditary neoplastic syndrome

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 0.37	GERP 0.32, phastCons 1
Overall
CADD	9.897	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00017% European (non-Finnish) · 2/1,179,148 alleles

Filtering AF 2.8e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 1.1e-05%

Overall 0.000124% 2/1,611,182 alleles · very rare exomes 1/1,459,050 · genomes 1/152,132 · joint denominator

Rarity supports pathogenicity (ACMG PM2); frequency above a disease-specific BA1/BS1 threshold argues against it. A variant frequent in one ancestry group can be near-absent in others, so a single global figure can mislead.

Variant & gene context

Gene: RB1
Protein: p.Ser463=
Coding: c.1389A>G
MANE Select: NM_000321
dbSNP: rs1486168292
Type: single nucleotide variant
Location: chr13:48379650 (GRCh38)
Gene constraint: LOEUF 0.239 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 77.03 · 19 PDB
Residue 463: an α-helix; the 'pocket; binds t and e1a' region; the 'domain a' region

Full RB1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

hereditary neoplastic syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: retinoblastoma

Similar variants

RB1 c.1049+1G>A Pathogenic/Likely pathogenic ★★ same condition
RB1 c.1049+1G>T Pathogenic/Likely pathogenic ★★ same condition
RB1 c.1049+3A>G Pathogenic/Likely pathogenic ★★ same condition
RB1 c.1050-2A>G Pathogenic/Likely pathogenic ★★ same condition
RB1 c.1128-1G>A Pathogenic ★★ same condition
RB1 c.1128-2A>G Pathogenic ★★ same condition
RB1 c.1215+1G>A Pathogenic ★★ same condition
RB1 c.1215+1G>C 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/rb1-p-ser463 (accessed [today's date]).

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