Is MTTP p.Glu234Asp (c.702A>C) pathogenic?

MTTP p.Glu234Asp (c.702A>C) is classified Uncertain significance in MTTP (ClinVar, Single submitter, 1 submitter; last evaluated 2022-07-19). AlphaMissense: likely pathogenic (0.6218); Very rare (popmax 0.00314%, nfe).

How common is MTTP p.Glu234Asp (c.702A>C) in the general population?

MTTP p.Glu234Asp (c.702A>C) is very rare (popmax 0.00314%, nfe) (gnomAD).

What do computational predictors say about MTTP p.Glu234Asp (c.702A>C)?

AlphaMissense predicts likely pathogenic (score 0.6218) — an in-silico prediction, not a clinical call.

MTTP p.Glu234Asp

c.702A>C · rs771994154 · VCV2141343

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.6218 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00314%, nfe)

Missense predictors

1/2 damaging

AlphaMissense, SaProt · REVEL indeterminate

Computational evidence

Protein change
AlphaMissense	0.6218	likely pathogenic
REVEL	0.395	indeterminate
SaProt	LLR -8.17	tolerated
⇒ AlphaMissense calls this damaging; SaProt does not; REVEL is indeterminate.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 4.9	GERP -1.2, phastCons 1
Regional constraint	o/e 0.89	unconstrained · MANE · 48 kb · p 0.00018 · regional, not allelic
Overall
CADD	22.0	PHRED · no single calibrated threshold — expert panels disagree

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

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00314% European (non-Finnish) · 37/1,179,560 alleles

Filtering AF 0.00231% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00202%

Overall 0.00236% 38/1,613,338 alleles · very rare exomes 34/1,461,122 · genomes 4/152,216 · joint denominator

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.00314%	31,880
Remaining individualsnot grpmax-eligible	0.0016%	62,440

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: MTTP
Protein: p.Glu234Asp
Coding: c.702A>C
MANE Select: NM_001386140
dbSNP: rs771994154
Type: single nucleotide variant
Location: chr4:99591734 (GRCh38)
Gene constraint: LOEUF 0.672 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 86.73 · 2 PDB
Residue 234: the vitellogenin domain

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

Similar variants

MTTP c.1067+1G>C Likely pathogenic ★★ same type
MTTP c.1236+1G>A Pathogenic/Likely pathogenic ★★ same type
MTTP c.1769+2T>C Pathogenic/Likely pathogenic ★★ same type
MTTP c.1867+1G>A Pathogenic ★★ same type
MTTP c.1867+5G>A Pathogenic/Likely pathogenic ★★ same type
MTTP c.1868-2A>G Likely pathogenic ★★ same type
MTTP c.2342+1G>A Pathogenic ★★ same type
MTTP c.502-1G>C Likely pathogenic ★★ same type

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/mttp-p-glu234asp (accessed [today's date]).

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