Is DPYD p.Gln299Ter (c.895C>T) pathogenic?

DPYD p.Gln299Ter (c.895C>T) is classified Likely pathogenic in DPYD (ClinVar, Multiple submitters, 2 submitters; last evaluated 2023-02-10). Very rare (popmax 0.000932%, nfe); Associated with dihydropyrimidine dehydrogenase deficiency.

What condition is associated with DPYD p.Gln299Ter (c.895C>T)?

DPYD p.Gln299Ter (c.895C>T) is associated with dihydropyrimidine dehydrogenase deficiency (ClinVar).

How common is DPYD p.Gln299Ter (c.895C>T) in the general population?

DPYD p.Gln299Ter (c.895C>T) is very rare (popmax 0.000932%, nfe) (gnomAD).

How is Dihydropyrimidine dehydrogenase deficiency inherited?

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

DPYD p.Gln299Ter

c.895C>T · rs2102259303 · VCV1335974

Likely pathogenic Multiple submitters

Classification

Likely pathogenic

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

Consequence

nonsense (stop-gain)

predicted LoF

gnomAD v4.1

Rare

very rare (popmax 0.000932%, nfe)

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 9 of 23
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 6.9	GERP 0.83, phastCons 1
Overall
CADD	36.0	PHRED · no single calibrated threshold — expert panels disagree

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

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.000932% European (non-Finnish) · 11/1,179,708 alleles

Filtering AF 0.0005% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000366%

Overall 0.000821% 12/1,461,488 alleles · very rare

Ancestry group	Frequency	1 in
Remaining individualsnot grpmax-eligible	0.0016%	62,488
European (non-Finnish)grpmax	0.000932%	107,246

Remaining individuals shows a higher raw frequency than the grpmax group above it. gnomAD excludes bottlenecked groups — Finnish, Ashkenazi Jewish, Amish and “Remaining individuals” — from grpmax, because founder effects make their frequencies unrepresentative for filtering. The table is sorted by frequency, so an excluded group can sit above the grpmax row.

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: DPYD
Protein: p.Gln299Ter
Coding: c.895C>T
MANE Select: NM_000110
dbSNP: rs2102259303
Type: single nucleotide variant
Location: chr1:97595122 (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.1340-2A>C Likely pathogenic ★★ same condition
DPYD c.1905+1G>C Pathogenic/Likely pathogenic ★★ same condition
DPYD c.233+1G>T Likely pathogenic ★★ same condition
DPYD c.2622+1G>A Likely pathogenic ★★ same condition
DPYD c.2767-1G>A Likely pathogenic ★★ same condition
DPYD c.680+1G>T Likely pathogenic ★★ same condition
DPYD p.Arg21Ter Pathogenic/Likely pathogenic ★★ same condition
DPYD p.Arg561Ter Pathogenic/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-gln299ter (accessed [today's date]).

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