Is DDOST p.Ser438= (c.1314C>T) pathogenic?

DDOST p.Ser438= (c.1314C>T) is classified Likely benign in DDOST (ClinVar, Single submitter, 1 submitter; last evaluated 2019-12-31). Ultra-rare (popmax 0.0223%, eas); Associated with DDOST-congenital disorder of glycosylation.

What condition is associated with DDOST p.Ser438= (c.1314C>T)?

DDOST p.Ser438= (c.1314C>T) is associated with DDOST-congenital disorder of glycosylation (ClinVar).

How common is DDOST p.Ser438= (c.1314C>T) in the general population?

DDOST p.Ser438= (c.1314C>T) is ultra-rare (popmax 0.0223%, eas) (gnomAD).

How is DDOST-CDG inherited?

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

DDOST p.Ser438=

c.1314C>T · rs764406890 · VCV797094

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.0223%, eas)

Conditions

DDOST-congenital disorder of glycosylation

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 -6	GERP -5.3
Overall
CADD	0.89	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0223% East Asian · 10/44,846 alleles

Filtering AF 0.012% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00917%

Overall 0.00155% 25/1,611,140 alleles · ultra-rare

Ancestry group	Frequency	1 in
East Asiangrpmax	0.0223%	4,485
African / African-American	0.00936%	10,685
Admixed American	0.00168%	59,584
Remaining individualsnot grpmax-eligible	0.0016%	62,366
European (non-Finnish)	0.000509%	196,462

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: DDOST
Protein: p.Ser438=
Coding: c.1314C>T
MANE Select: NM_005216
dbSNP: rs764406890
Type: single nucleotide variant
Location: chr1:20652385 (GRCh38)
Gene constraint: LOEUF 0.747 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 89.27 · 6 PDB
Residue 438: an α-helix

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

Disease context

DDOST-congenital disorder of glycosylation — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For DDOST-CDG (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal

Similar variants

DDOST p.Gln215His Pathogenic/Likely pathogenic ★★ ⚠ same condition
DDOST c.-18T>G Uncertain significance ★★ ⚠ same condition
DDOST p.Ala11Val Uncertain significance ★★ ⚠ same condition
DDOST p.Ala219Val Uncertain significance ★★ ⚠ same condition
DDOST p.Ala232Ser Uncertain significance ★★ ⚠ same condition
DDOST p.Ala415Thr Uncertain significance ★★ ⚠ same condition
DDOST p.Arg237His Uncertain significance ★★ ⚠ same condition
DDOST p.Arg280Cys Uncertain significance ★★ ⚠ 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/ddost-p-ser438 (accessed [today's date]).

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