Is AVPR2 p.Ala63= (c.189T>C) pathogenic?

AVPR2 p.Ala63= (c.189T>C) is classified Benign/Likely benign in AVPR2 (ClinVar, Multiple submitters, 4 submitters; last evaluated 2026-01-28). Rare (popmax 0.167%, sas); Associated with diabetes insipidus, nephrogenic, X-linked.

What condition is associated with AVPR2 p.Ala63= (c.189T>C)?

AVPR2 p.Ala63= (c.189T>C) is associated with diabetes insipidus, nephrogenic, X-linked, nephrogenic syndrome of inappropriate antidiuresis (ClinVar).

How common is AVPR2 p.Ala63= (c.189T>C) in the general population?

AVPR2 p.Ala63= (c.189T>C) is rare (popmax 0.167%, sas) (gnomAD).

How is Arginine vasopressin resistance inherited?

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

AVPR2 p.Ala63=

c.189T>C · rs140156037 · VCV368074

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 4 submitters

gnomAD v4.1

Rare

rare (popmax 0.167%, sas)

Conditions

diabetes insipidus, nephrogenic, X-linked

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 -6.8	GERP -3.4
Overall
CADD	0.429	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.167% South Asian · 95/56,909 alleles

Filtering AF 0.14% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.13%

Overall 0.0503% 608/1,209,909 alleles · rare

Ancestry group	Frequency	1 in
South Asiangrpmax	0.167%	599
European (non-Finnish)	0.0544%	1,838
Finnishnot grpmax-eligible	0.0174%	5,742
Admixed American	0.013%	7,670
Remaining individualsnot grpmax-eligible	0.0126%	7,928
African / African-American	0.0104%	9,611

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: AVPR2
Protein: p.Ala63=
Coding: c.189T>C
MANE Select: NM_000054
dbSNP: rs140156037
Type: single nucleotide variant
Location: chrX:153905695 (GRCh38)
Structure: AlphaFold pLDDT 76.84 · 44 PDB
Residue 63: an α-helix; a UniProt-annotated variant site (in ndi1)

Full AVPR2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

diabetes insipidus, nephrogenic, X-linked — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: nephrogenic syndrome of inappropriate antidiuresis

For Arginine vasopressin resistance (Orphanet):

Inheritance: Autosomal dominant, Autosomal recessive, X-linked recessive
Onset: Infancy, Neonatal
Prevalence: 1-9 / 1 000 000 (Europe)

Similar variants

AVPR2 p.Arg104Cys Pathogenic/Likely pathogenic ★★ ⚠ same condition
AVPR2 p.Arg113Trp Pathogenic ★★ same condition
AVPR2 p.Arg137Cys Pathogenic ★★ same condition
AVPR2 p.Arg137His Pathogenic ★★ same condition
AVPR2 p.Arg181Cys Pathogenic ★★ same condition
AVPR2 p.Arg202Cys Pathogenic/Likely pathogenic ★★ ⚠ same condition
AVPR2 p.Arg337Ter Pathogenic ★★ same condition
AVPR2 p.Asp85Asn 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/avpr2-p-ala63 (accessed [today's date]).

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