Is MEN1 p.Pro320Ala (c.958C>G) pathogenic?

MEN1 p.Pro320Ala (c.958C>G) is classified Uncertain significance in MEN1 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2026-03-06). AlphaMissense: likely pathogenic (0.9868); Absent from gnomAD v4.1; Associated with hereditary neoplastic syndrome.

What condition is associated with MEN1 p.Pro320Ala (c.958C>G)?

MEN1 p.Pro320Ala (c.958C>G) is associated with hereditary neoplastic syndrome, multiple endocrine neoplasia type 1 (ClinVar).

How common is MEN1 p.Pro320Ala (c.958C>G) in the general population?

MEN1 p.Pro320Ala (c.958C>G) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about MEN1 p.Pro320Ala (c.958C>G)?

AlphaMissense predicts likely pathogenic (score 0.9868) — an in-silico prediction, not a clinical call.

MEN1 p.Pro320Ala

c.958C>G · rs1941726727 · VCV1418732

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely pathogenic

0.9868 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

2/2 damaging

AlphaMissense, REVEL

Conditions

hereditary neoplastic syndrome

Computational evidence

Protein change
AlphaMissense	0.9868	likely pathogenic
REVEL	0.972	strongly pathogenic-leaning
⇒ AlphaMissense and REVEL both call this damaging.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 12	GERP 1.1, phastCons 1
Regional constraint	o/e 0.61	unconstrained · MANE · 4,962 bp · p 4.4e-20 · regional, not allelic
Overall
CADD	29.4	PHRED · no single calibrated threshold — expert panels disagree

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

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

⚠ Isoform check: AlphaMissense numbered on a different transcript (AM P325A vs ClinVar P320A) — verify the residue.

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: MEN1
Protein: p.Pro320Ala
Coding: c.958C>G
MANE Select: NM_001370259
dbSNP: rs1941726727
Type: single nucleotide variant
Location: chr11:64806323 (GRCh38)
Gene constraint: LOEUF 0.206 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 85.13 · 69 PDB
Residue 320: the 'interaction with fancd2' region; an α-helix; a UniProt-annotated variant site (in men1)

Full MEN1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

hereditary neoplastic syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: multiple endocrine neoplasia type 1

Similar variants

MEN1 p.Pro320Leu Pathogenic/Likely pathogenic ★★ same residue
MEN1 p.Pro320Ser Uncertain significance ★★ ⚠ same residue
MEN1 p.Pro320Thr Likely pathogenic ★ same residue
MEN1 p.Pro320Arg Conflicting classifications of pathogenicity ★ ⚠ same residue
MEN1 p.Pro320= Likely benign ★ same residue
MEN1 c.1049+1G>A Pathogenic ★★ same condition
MEN1 c.1049+1G>C Pathogenic ★★ same condition
MEN1 c.1049+2T>C 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/men1-p-pro320ala (accessed [today's date]).

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