Is SON p.Pro445Ser (c.1333C>T) pathogenic?

SON p.Pro445Ser (c.1333C>T) is classified Uncertain significance in SON (ClinVar, Single submitter, 1 submitter; last evaluated 2023-06-16). AlphaMissense: likely benign (0.0605); Very rare (popmax 0.000932%, nfe); Associated with SON-related disorder.

What condition is associated with SON p.Pro445Ser (c.1333C>T)?

SON p.Pro445Ser (c.1333C>T) is associated with SON-related disorder (ClinVar).

How common is SON p.Pro445Ser (c.1333C>T) in the general population?

SON p.Pro445Ser (c.1333C>T) is very rare (popmax 0.000932%, nfe) (gnomAD).

What do computational predictors say about SON p.Pro445Ser (c.1333C>T)?

AlphaMissense predicts likely benign (score 0.0605) — an in-silico prediction, not a clinical call.

SON p.Pro445Ser

c.1333C>T · rs1445356758 · VCV2635969

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0605 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.000932%, nfe)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

SON-related disorder

Computational evidence

Protein change
AlphaMissense	0.0605	likely benign
REVEL	0.045	moderately benign-leaning
SaProt	LLR -6.45	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 1.9	GERP 2.5, phastCons 1
Regional constraint	o/e 1.04	unconstrained · MANE · 7,951 bp · p 0.32 · regional, not allelic
Overall
CADD	8.538	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 0.000932% European (non-Finnish) · 11/1,179,906 alleles

Filtering AF 0.0005% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000366%

Overall 0.000682% 11/1,613,710 alleles · very rare exomes 11/1,461,810 · genomes 0/151,900 · 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: SON
Protein: p.Pro445Ser
Coding: c.1333C>T
MANE Select: NM_138927
dbSNP: rs1445356758
Type: single nucleotide variant
Location: chr21:33550564 (GRCh38)
Gene constraint: LOEUF 0.051 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 36.48 · 4 PDB

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

Disease context

SON-related disorder

Similar variants

SON p.Gln45Pro Uncertain significance ★★ ⚠ same condition
SON p.Leu1666Val Uncertain significance ★★ ⚠ same condition
SON p.Pro431His Uncertain significance ★★ ⚠ same condition
SON p.Ser609Leu Uncertain significance ★★ ⚠ same condition
SON p.Thr1382Ser Uncertain significance ★★ ⚠ same condition
SON p.Arg1956His Likely pathogenic ★ ⚠ same condition
SON p.Gln228Ter Likely pathogenic ★ same condition
SON p.Gln918Ter 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/son-p-pro445ser (accessed [today's date]).

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