Is CAST p.Ser603Pro (c.1807T>C) pathogenic?

CAST p.Ser603Pro (c.1807T>C) is classified Uncertain significance in CAST (ClinVar, Single submitter, 1 submitter; last evaluated 2023-04-18). AlphaMissense: likely benign (0.151); Ultra-rare (popmax 0.0156%, eas); Associated with Inborn genetic diseases.

What condition is associated with CAST p.Ser603Pro (c.1807T>C)?

CAST p.Ser603Pro (c.1807T>C) is associated with Inborn genetic diseases (ClinVar).

How common is CAST p.Ser603Pro (c.1807T>C) in the general population?

CAST p.Ser603Pro (c.1807T>C) is ultra-rare (popmax 0.0156%, eas) (gnomAD).

What do computational predictors say about CAST p.Ser603Pro (c.1807T>C)?

AlphaMissense predicts likely benign (score 0.151) — an in-silico prediction, not a clinical call.

CAST p.Ser603Pro

c.1807T>C · rs745933901 · VCV2537507

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.151 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0156%, eas)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Inborn genetic diseases

Computational evidence

Protein change
AlphaMissense	0.151	likely benign
REVEL	0.075	moderately benign-leaning
SaProt	LLR -9.20	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 -0.41	GERP -1.4
Overall
CADD	19.1	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.

⚠ Isoform check: AlphaMissense numbered on a different transcript (AM S520P vs ClinVar S603P) — verify the residue.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0156% East Asian · 7/44,878 alleles

Filtering AF 0.00726% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00515%

Overall 0.000548% 8/1,461,122 alleles · ultra-rare

Ancestry group	Frequency	1 in
East Asiangrpmax	0.0156%	6,411
Remaining individualsnot grpmax-eligible	0.0016%	62,472

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: CAST
Protein: p.Ser603Pro
Coding: c.1807T>C
dbSNP: rs745933901
Type: single nucleotide variant
Location: chr5:96757628 (GRCh38)
Gene constraint: LOEUF 1.208 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 59.67
Residue 603: the 'disordered' region

Full CAST 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

PCSK1 p.Gln603Ter Uncertain significance same residue
CAST p.Ala329Gly Uncertain significance ★★ ⚠ same condition
CAST p.Asp160Val Uncertain significance ★★ ⚠ same condition
CAST p.Gln731His Uncertain significance ★★ ⚠ same condition
CAST p.Glu296Gly Uncertain significance ★★ ⚠ same condition
CAST p.Ile274Val Uncertain significance ★★ ⚠ same condition
CAST p.Leu586Pro Uncertain significance ★★ ⚠ same condition
CAST p.Ser231Leu 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/cast-p-ser603pro (accessed [today's date]).

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