Is DPYD p.Pro374fs (c.1121del) pathogenic?

DPYD p.Pro374fs (c.1121del) is classified Likely pathogenic in DPYD (ClinVar, No assertion criteria, 1 submitter; last evaluated 2017-09-01). Absent from gnomAD; Associated with dihydropyrimidine dehydrogenase deficiency.

What condition is associated with DPYD p.Pro374fs (c.1121del)?

DPYD p.Pro374fs (c.1121del) is associated with dihydropyrimidine dehydrogenase deficiency (ClinVar).

How common is DPYD p.Pro374fs (c.1121del) in the general population?

DPYD p.Pro374fs (c.1121del) is absent from gnomAD (gnomAD).

How is Dihydropyrimidine dehydrogenase deficiency inherited?

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

DPYD p.Pro374fs

c.1121del · rs1553201443 · VCV553633

Likely pathogenic No assertion criteria

Classification

Likely pathogenic

ClinVar

Review

No assertion criteria ☆☆☆☆

ClinVar · 1 submitter

Consequence

frameshift

predicted LoF

gnomAD v4.1

Not reported

no gnomAD frequency available for this variant

Conditions

dihydropyrimidine dehydrogenase deficiency

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Consequence	frameshift	predicted loss-of-function
NMD	predicted	premature termination codon in exon 10 of 23
Splicing
SpliceAI	—	not assessed · substitutions only
Constraint at this position
Conservation	phyloP -4.9	GERP -5.9

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: DPYD
Protein: p.Pro374fs
Coding: c.1121del
MANE Select: NM_000110
dbSNP: rs1553201443
Type: Deletion
Location: chr1:97593225 (GRCh38)
Gene constraint: LOEUF 1.09 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 96.23

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

Disease context

dihydropyrimidine dehydrogenase deficiency — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Dihydropyrimidine dehydrogenase deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: All ages

Similar variants

DPYD c.1977_1983del Likely pathogenic ★★ same condition
DPYD p.Arg589fs Likely pathogenic ★★ same condition
DPYD p.Arg916fs Likely pathogenic ★★ same condition
DPYD p.Gln860fs Pathogenic/Likely pathogenic ★★ same condition
DPYD p.Leu682fs Likely pathogenic ★★ same condition
DPYD p.Lys42_Arg43insTer Pathogenic/Likely pathogenic ★★ same condition
DPYD c.850+23455_1128+8811del Likely pathogenic ★ same condition
DPYD p.Ala946fs Likely 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/dpyd-p-pro374fs (accessed [today's date]).

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