Is CASR p.Arg866Pro (c.2597G>C) pathogenic?

CASR p.Arg866Pro (c.2597G>C) is classified Uncertain significance in CASR (ClinVar, Multiple submitters, 2 submitters; last evaluated 2024-12-27). AlphaMissense: likely pathogenic (0.9656); Absent from gnomAD v4.1; Associated with familial hypocalciuric hypercalcemia.

What condition is associated with CASR p.Arg866Pro (c.2597G>C)?

CASR p.Arg866Pro (c.2597G>C) is associated with familial hypocalciuric hypercalcemia, autosomal dominant hypocalcemia 1 (ClinVar).

How common is CASR p.Arg866Pro (c.2597G>C) in the general population?

CASR p.Arg866Pro (c.2597G>C) is absent from gnomAD v4.1 (gnomAD).

How is Familial hypocalciuric hypercalcemia inherited?

Typically Autosomal dominant (Orphanet). A genetic counselor can assess individual risk for a family.

What do computational predictors say about CASR p.Arg866Pro (c.2597G>C)?

AlphaMissense predicts likely pathogenic (score 0.9656) — an in-silico prediction, not a clinical call.

CASR p.Arg866Pro

c.2597G>C · rs387907401 · VCV463931

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely pathogenic

0.9656 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

familial hypocalciuric hypercalcemia

Computational evidence

Protein change
AlphaMissense	0.9656	likely pathogenic
REVEL	0.819	moderately pathogenic-leaning
SaProt	LLR -14.49	damaging
⇒ AlphaMissense, REVEL and SaProt all call this damaging.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 12	GERP 2.1, phastCons 1
Regional constraint	o/e 0.57	unconstrained · MANE · 153 bp · p 0.00027 · regional, not allelic
Overall
CADD	29.9	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.

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: CASR
Protein: p.Arg866Pro
Coding: c.2597G>C
MANE Select: NM_000388
dbSNP: rs387907401
Type: single nucleotide variant
Location: chr3:122284551 (GRCh38)
Gene constraint: LOEUF 0.469 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 76.01 · 31 PDB
Residue 866: a UniProt-annotated variant site (in hhc1; impaired homodimerization; impaired cell membrane localization); the 'c-terminus' region; a β-strand

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

Disease context

familial hypocalciuric hypercalcemia — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: autosomal dominant hypocalcemia 1

For Familial hypocalciuric hypercalcemia (Orphanet):

Inheritance: Autosomal dominant
Onset: All ages

Similar variants

CASR p.Arg866Cys Uncertain significance ★★ ⚠ same residue
CASR p.Arg866His Uncertain significance ★★ ⚠ same residue
CASR p.Arg866= Likely benign ★ same residue
CASR p.Arg866Leu Uncertain significance ★ same residue
CASR p.Arg866Gly Uncertain significance ★ ⚠ same residue
CASR c.1378-1G>C Likely pathogenic ★★ same condition
CASR c.1608+1G>A Likely pathogenic ★★ same condition
CASR c.1609-2A>G 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/casr-p-arg866pro (accessed [today's date]).

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