Is CCN3 p.Leu149Val (c.445C>G) pathogenic?

CCN3 p.Leu149Val (c.445C>G) is classified Uncertain significance in CCN3 (ClinVar, Single submitter, 1 submitter; last evaluated 2023-12-13). AlphaMissense: likely benign (0.1299); Rare (popmax 0.177%, afr).

How common is CCN3 p.Leu149Val (c.445C>G) in the general population?

CCN3 p.Leu149Val (c.445C>G) is rare (popmax 0.177%, afr) (gnomAD).

What do computational predictors say about CCN3 p.Leu149Val (c.445C>G)?

AlphaMissense predicts likely benign (score 0.1299) — an in-silico prediction, not a clinical call.

CCN3 p.Leu149Val

c.445C>G · rs146782554 · VCV3139801

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1299 · ACMG-weighted

gnomAD v4.1

Rare

rare (popmax 0.177%, afr)

Missense predictors

1/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.1299	likely benign
REVEL	0.251	benign-leaning
SaProt	LLR -10.20	damaging
⇒ SaProt calls this damaging; AlphaMissense and REVEL do not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 2.2	GERP 2, phastCons 1
Regional constraint	o/e 1.02	unconstrained · MANE · 6,596 bp · p 0.65 · regional, not allelic
Overall
CADD	22.9	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 0.177% African / African-American · 133/75,050 alleles

Filtering AF 0.153% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.143%

Overall 0.00898% 145/1,614,198 alleles · rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.177%	564
Remaining individualsnot grpmax-eligible	0.016%	6,251
Admixed American	0.00333%	30,008

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: CCN3
Protein: p.Leu149Val
Coding: c.445C>G
MANE Select: NM_002514
dbSNP: rs146782554
Type: single nucleotide variant
Location: chr8:119418192 (GRCh38)
Gene constraint: LOEUF 0.966 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 77.88
Residue 149: the vwfc domain

Full CCN3 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

CCN3 p.Cys15Phe Benign ★★ same type
CCN3 p.Ala157Asp Uncertain significance ★ ⚠ same type
CCN3 p.Ala187Ser Uncertain significance ★ ⚠ same type
CCN3 p.Ala51Ser Uncertain significance ★ ⚠ same type
CCN3 p.Arg143His Uncertain significance ★ ⚠ same type
CCN3 p.Arg227Trp Uncertain significance ★ ⚠ same type
CCN3 p.Arg233Cys Uncertain significance ★ ⚠ same type
CCN3 p.Arg299His Uncertain significance ★ ⚠ 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/ccn3-p-leu149val (accessed [today's date]).

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