Is MPI p.Thr386Ser (c.1156A>T) pathogenic?

MPI p.Thr386Ser (c.1156A>T) is classified Uncertain significance in MPI (ClinVar, No assertion criteria, 1 submitter; last evaluated 2020-04-19). AlphaMissense: likely benign (0.0834); Very rare (popmax 0.000847%, nfe); Associated with MPI-congenital disorder of glycosylation.

What condition is associated with MPI p.Thr386Ser (c.1156A>T)?

MPI p.Thr386Ser (c.1156A>T) is associated with MPI-congenital disorder of glycosylation (ClinVar).

How common is MPI p.Thr386Ser (c.1156A>T) in the general population?

MPI p.Thr386Ser (c.1156A>T) is very rare (popmax 0.000847%, nfe) (gnomAD).

How is MPI-CDG inherited?

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

What do computational predictors say about MPI p.Thr386Ser (c.1156A>T)?

AlphaMissense predicts likely benign (score 0.0834) — an in-silico prediction, not a clinical call.

MPI p.Thr386Ser

c.1156A>T · rs769768397 · VCV989852

Uncertain significance No assertion criteria

Classification

Uncertain significance

ClinVar

Review

No assertion criteria ☆☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0834 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.000847%, nfe)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

MPI-congenital disorder of glycosylation

Computational evidence

Protein change
AlphaMissense	0.0834	likely benign
REVEL	0.171	moderately benign-leaning
SaProt	LLR -6.17	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 1.5	GERP -4.5, phastCons 0.054
Regional constraint	o/e 0.98	unconstrained · MANE · 7,653 bp · p 0.66 · regional, not allelic
Overall
CADD	3.338	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.000847% European (non-Finnish) · 10/1,180,038 alleles

Filtering AF 0.000429% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000312%

Overall 0.000682% 11/1,614,050 alleles · very rare

Ancestry group	Frequency	1 in
Remaining individualsnot grpmax-eligible	0.0016%	62,484
European (non-Finnish)grpmax	0.000847%	118,004

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: MPI
Protein: p.Thr386Ser
Coding: c.1156A>T
MANE Select: NM_002435
dbSNP: rs769768397
Type: single nucleotide variant
Location: chr15:74897614 (GRCh38)
Gene constraint: LOEUF 1.04 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 96.50

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

Disease context

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

For MPI-CDG (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal

Similar variants

MPI p.Thr386Ile Uncertain significance ★ ⚠ same residue
MPI c.145-1G>C Likely pathogenic ★★ same condition
MPI c.16+2T>C Likely pathogenic ★★ same condition
MPI c.488-1G>C Pathogenic/Likely pathogenic ★★ same condition
MPI c.488-2A>G Likely pathogenic ★★ same condition
MPI c.844+1G>A Likely pathogenic ★★ same condition
MPI c.845-2A>G Likely pathogenic ★★ same condition
MPI p.Arg219Gln 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/mpi-p-thr386ser (accessed [today's date]).

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