Is DPYD p.Asp346Ter (c.1035dup) pathogenic?

DPYD p.Asp346Ter (c.1035dup) is classified Likely pathogenic in DPYD (ClinVar, Single submitter, 1 submitter; last evaluated 2023-03-02). Absent from gnomAD; Associated with dihydropyrimidine dehydrogenase deficiency.

What condition is associated with DPYD p.Asp346Ter (c.1035dup)?

DPYD p.Asp346Ter (c.1035dup) is associated with dihydropyrimidine dehydrogenase deficiency (ClinVar).

How common is DPYD p.Asp346Ter (c.1035dup) in the general population?

DPYD p.Asp346Ter (c.1035dup) 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.Asp346Ter

c.1035dup · rs1654652414 · VCV2674933

Likely pathogenic Single submitter

Classification

Likely pathogenic

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

Consequence

nonsense (stop-gain)

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	nonsense (stop-gain)	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 7.6	GERP 2.9, 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: DPYD
Protein: p.Asp346Ter
Coding: c.1035dup
MANE Select: NM_000110
dbSNP: rs1654652414
Type: Duplication
Location: chr1:97593310 (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 p.Leu461fs Pathogenic/Likely pathogenic ★★ same condition
DPYD c.1905+2dup Likely pathogenic ★ same condition
DPYD p.Arg332fs Likely pathogenic ★ same condition
DPYD p.Asn736fs Pathogenic ★ same condition
DPYD p.Ile454fs Likely pathogenic ★ same condition
DPYD p.Ile591fs Likely pathogenic ★ same condition
DPYD p.Leu572fs Likely pathogenic ★ same condition
DPYD p.Leu5fs 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-asp346ter (accessed [today's date]).

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