Is CASR p.Ser301= (c.903C>T) pathogenic?

CASR p.Ser301= (c.903C>T) is classified Likely benign in CASR (ClinVar, Multiple submitters, 2 submitters; last evaluated 2023-11-02). Very rare (popmax 0.000508%, nfe); Associated with Nephrolithiasis/nephrocalcinosis.

What condition is associated with CASR p.Ser301= (c.903C>T)?

CASR p.Ser301= (c.903C>T) is associated with Nephrolithiasis/nephrocalcinosis, autosomal dominant hypocalcemia 1, familial hypocalciuric hypercalcemia (ClinVar).

How common is CASR p.Ser301= (c.903C>T) in the general population?

CASR p.Ser301= (c.903C>T) is very rare (popmax 0.000508%, nfe) (gnomAD).

CASR p.Ser301=

c.903C>T · rs2107632513 · VCV1110801

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.000508%, nfe)

Conditions

Nephrolithiasis/nephrocalcinosis

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 -0.079	GERP 0.24, phastCons 0.55
Overall
CADD	7.818	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.000508% European (non-Finnish) · 6/1,179,984 alleles

Filtering AF 0.000183% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00012%

Overall 0.00041% 6/1,461,818 alleles · very rare

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: CASR
Protein: p.Ser301=
Coding: c.903C>T
MANE Select: NM_000388
dbSNP: rs2107632513
Type: single nucleotide variant
Location: chr3:122261938 (GRCh38)
Gene constraint: LOEUF 0.469 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 76.01 · 31 PDB
Residue 301: the 'ligand-binding 2 (lb2)' region; a disulfide bond

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

Disease context

Nephrolithiasis/nephrocalcinosis — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: autosomal dominant hypocalcemia 1 familial hypocalciuric hypercalcemia

Similar variants

CASR p.Ser301Ile Uncertain significance ★★ ⚠ same residue
CASR p.Ser301Cys 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

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-ser301 (accessed [today's date]).

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