Is DPM1 p.Leu256= (c.768T>C) pathogenic?

DPM1 p.Leu256= (c.768T>C) is classified Likely benign in DPM1 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-10-21). Very rare (popmax 0.00167%, amr); Associated with congenital disorder of glycosylation type 1E.

What condition is associated with DPM1 p.Leu256= (c.768T>C)?

DPM1 p.Leu256= (c.768T>C) is associated with congenital disorder of glycosylation type 1E (ClinVar).

How common is DPM1 p.Leu256= (c.768T>C) in the general population?

DPM1 p.Leu256= (c.768T>C) is very rare (popmax 0.00167%, amr) (gnomAD).

How is DPM1-CDG inherited?

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

DPM1 p.Leu256=

c.768T>C · rs755380657 · VCV2736804

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00167%, amr)

Conditions

congenital disorder of glycosylation type 1E

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
REVEL	0.155	moderately benign-leaning
Splicing
SpliceAI	—	not looked up on this page · why
Constraint at this position
Conservation	phyloP -1.4	GERP -3.5
Overall
CADD	0.805	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00167% Admixed American · 1/59,956 alleles

Filtering AF 0.000127% ClinGen BA1/BS1 input FAF95, joint · FAF99 9.2e-05%

Overall 0.000418% 6/1,433,958 alleles · very rare

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.00167%	59,956
European (non-Finnish)	0.000433%	231,094

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: DPM1
Protein: p.Leu256=
Coding: c.768T>C
dbSNP: rs755380657
Type: single nucleotide variant
Location: chr20:50935147 (GRCh38)

Full DPM1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

congenital disorder of glycosylation type 1E — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For DPM1-CDG (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal

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/dpm1-p-leu256 (accessed [today's date]).

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