Is FREM2 p.Cys256Arg (c.766T>C) pathogenic?

FREM2 p.Cys256Arg (c.766T>C) is classified Uncertain significance in FREM2 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-05-20). AlphaMissense: likely pathogenic (0.9782); Very rare (popmax 8.48e-05%, nfe); Associated with Inborn genetic diseases.

What condition is associated with FREM2 p.Cys256Arg (c.766T>C)?

FREM2 p.Cys256Arg (c.766T>C) is associated with Inborn genetic diseases (ClinVar).

How common is FREM2 p.Cys256Arg (c.766T>C) in the general population?

FREM2 p.Cys256Arg (c.766T>C) is very rare (popmax 8.48e-05%, nfe) (gnomAD).

What do computational predictors say about FREM2 p.Cys256Arg (c.766T>C)?

AlphaMissense predicts likely pathogenic (score 0.9782) — an in-silico prediction, not a clinical call.

FREM2 p.Cys256Arg

c.766T>C · VCV3279814

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.9782 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 8.48e-05%, nfe)

Missense predictors

2/2 damaging

AlphaMissense, REVEL · SaProt no call

Conditions

Inborn genetic diseases

Computational evidence

Protein change
AlphaMissense	0.9782	likely pathogenic · top 2% in FREM2
REVEL	0.819	moderately pathogenic-leaning
SaProt	—	not scored · why
⇒ AlphaMissense and REVEL both call this damaging; SaProt makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.9	GERP 2.7, phastCons 1
Regional constraint	o/e 1.05	unconstrained · MANE · 169 kb · p 0.0054 · regional, not allelic
Overall
CADD	26.2	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 is an independent agreement signal.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 8.48e-05% European (non-Finnish) · 1/1,179,634 alleles

Overall 6.2e-05% 1/1,613,286 alleles · very rare exomes 1/1,460,944 · genomes 0/152,342 · joint denominator

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: FREM2
Protein: p.Cys256Arg
Coding: c.766T>C
MANE Select: NM_207361
Type: single nucleotide variant
Location: chr13:38688110 (GRCh38)
Gene constraint: LOEUF 0.588 · pLI <0.01 (gnomAD)

Full FREM2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Inborn genetic diseases — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

FREM2 p.Ala1029Val Uncertain significance ★★ ⚠ same condition
FREM2 p.Ala565Gly Uncertain significance ★★ same condition
FREM2 p.Ala61Pro Uncertain significance ★★ ⚠ same condition
FREM2 p.Arg1166Cys Uncertain significance ★★ ⚠ same condition
FREM2 p.Arg1523Cys Uncertain significance ★★ same condition
FREM2 p.Arg156Leu Uncertain significance ★★ ⚠ same condition
FREM2 p.Arg1765Cys Uncertain significance ★★ ⚠ same condition
FREM2 p.Arg1765His 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/frem2-p-cys256arg (accessed [today's date]).

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