Is APC p.Ser293fs (c.874_880del) pathogenic?

APC p.Ser293fs (c.874880del) is classified Pathogenic in APC (ClinVar, Single submitter, 1 submitter; last evaluated 2016-08-26). Absent from gnomAD; Associated with familial adenomatous polyposis 1.

What condition is associated with APC p.Ser293fs (c.874_880del)?

APC p.Ser293fs (c.874_880del) is associated with familial adenomatous polyposis 1 (ClinVar).

How common is APC p.Ser293fs (c.874_880del) in the general population?

APC p.Ser293fs (c.874_880del) is absent from gnomAD (gnomAD).

How is Familial adenomatous polyposis inherited?

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

APC p.Ser293fs

c.874_880del · rs1060503263 · VCV411346

Pathogenic Single submitter

Classification

Pathogenic

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

Consequence

frameshift

predicted LoF

gnomAD v4.1

Not reported

no gnomAD frequency available for this variant

Conditions

familial adenomatous polyposis 1

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Consequence	frameshift	predicted loss-of-function in a haploinsufficient gene (ClinGen)
NMD	predicted	premature termination codon in exon 9 of 16
Splicing
SpliceAI	—	not assessed · substitutions only
Constraint at this position
Conservation	phyloP 3.5	GERP 1.5, phastCons 1

Predicted loss-of-function is descriptive, not an applied PVS1 code.

Population frequency

dbSNP / gnomAD

No gnomAD frequency available for this variant. 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: APC
Protein: p.Ser293fs
Coding: c.874_880del
MANE Select: NM_000038
dbSNP: rs1060503263
Type: Deletion
Location: chr5:112815531 (GRCh38)
Gene constraint: LOEUF 0.321 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Residue 293: the 'disordered' region

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

Disease context

familial adenomatous polyposis 1 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Familial adenomatous polyposis (Orphanet):

Inheritance: Autosomal dominant, Autosomal recessive
Onset: Adult
Prevalence: 1-9 / 100 000 (Worldwide)

Similar variants

APC p.Ser293Asn Uncertain significance ★★ same residue
APC p.Ser293Ile Uncertain significance ★★ same residue
APC p.Ser293= Benign ★ same residue
APC c.1311_1312+1del Pathogenic ★★★ same condition
APC c.1312+4_1312+19del Likely pathogenic ★★★ same condition
APC p.Glu2172fs Pathogenic ★★★ same condition
APC p.Gly53fs Likely pathogenic ★★★ same condition
APC p.Leu68fs 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/apc-p-ser293fs (accessed [today's date]).

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