Is AVPR2 p.Arg149Cys (c.445C>T) pathogenic?

AVPR2 p.Arg149Cys (c.445C>T) is classified Uncertain significance in AVPR2 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2021-11-18). AlphaMissense: likely benign (0.2632); Very rare (popmax 0.00175%, sas); Associated with diabetes insipidus, nephrogenic, X-linked.

What condition is associated with AVPR2 p.Arg149Cys (c.445C>T)?

AVPR2 p.Arg149Cys (c.445C>T) is associated with diabetes insipidus, nephrogenic, X-linked, nephrogenic syndrome of inappropriate antidiuresis (ClinVar).

How common is AVPR2 p.Arg149Cys (c.445C>T) in the general population?

AVPR2 p.Arg149Cys (c.445C>T) is very rare (popmax 0.00175%, sas) (gnomAD).

How is Arginine vasopressin resistance inherited?

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

What do computational predictors say about AVPR2 p.Arg149Cys (c.445C>T)?

AlphaMissense predicts likely benign (score 0.2632) — an in-silico prediction, not a clinical call.

AVPR2 p.Arg149Cys

c.445C>T · rs905300222 · VCV382301

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely benign

0.2632 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00175%, sas)

Missense predictors

0/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

diabetes insipidus, nephrogenic, X-linked

Computational evidence

Protein change
AlphaMissense	0.2632	likely benign
REVEL	0.391	indeterminate
SaProt	LLR -9.12	tolerated
⇒ AlphaMissense and SaProt both call this tolerated; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 3.2	GERP 0.54, phastCons 1
Regional constraint	o/e 0.80	unconstrained · MANE · 1,579 bp · p 0.00022 · regional, not allelic
Overall
CADD	22.6	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.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00175% South Asian · 1/57,077 alleles

Filtering AF 3.7e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 1.4e-05%

Overall 0.000275% 3/1,089,875 alleles · very rare

Ancestry group	Frequency	1 in
South Asiangrpmax	0.00175%	57,077
European (non-Finnish)	0.000223%	447,836

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.Arg149Cys
Coding: c.445C>T
MANE Select: NM_000054
dbSNP: rs905300222
Type: single nucleotide variant
Location: chrX:153905951 (GRCh38)
Structure: AlphaFold pLDDT 76.84 · 44 PDB
Residue 149: a disulfide bond

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.Arg149His Uncertain significance ★★ ⚠ same residue
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

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-arg149cys (accessed [today's date]).

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