Is CASR p.Asn261= (c.783T>C) pathogenic?

CASR p.Asn261= (c.783T>C) is classified Likely benign in CASR (ClinVar, Multiple submitters, 2 submitters; last evaluated 2024-07-03). Absent from gnomAD v4.1; Associated with familial hypocalciuric hypercalcemia.

What condition is associated with CASR p.Asn261= (c.783T>C)?

CASR p.Asn261= (c.783T>C) is associated with familial hypocalciuric hypercalcemia, autosomal dominant hypocalcemia 1 (ClinVar).

How common is CASR p.Asn261= (c.783T>C) in the general population?

CASR p.Asn261= (c.783T>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.

CASR p.Asn261=

c.783T>C · rs1576858386 · VCV799284

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Absent

absent from gnomAD v4.1

Conditions

familial hypocalciuric hypercalcemia

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -0.05	GERP -0.93, phastCons 0.88
Overall
CADD	6.497	PHRED · no single calibrated threshold — expert panels disagree

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.Asn261=
Coding: c.783T>C
MANE Select: NM_000388
dbSNP: rs1576858386
Type: single nucleotide variant
Location: chr3:122261818 (GRCh38)
Gene constraint: LOEUF 0.469 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 76.01 · 31 PDB
Residue 261: the 'ligand-binding 2 (lb2)' region; an α-helix; a disulfide bond

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.Asn261Thr 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
CASR c.186-1G>T Pathogenic ★★ same condition
CASR c.493-2A>C Likely pathogenic ★★ same condition
CASR p.Ala581Val Likely pathogenic ★★ ⚠ same condition
CASR p.Ala835Asp Pathogenic/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-asn261 (accessed [today's date]).

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