Is DBH p.Arg343Gln (c.1028G>A) pathogenic?

DBH p.Arg343Gln (c.1028G>A) is classified Uncertain significance in DBH (ClinVar, Multiple submitters, 2 submitters; last evaluated 2023-10-13). AlphaMissense: likely benign (0.0875); Ultra-rare (popmax 0.0436%, nfe); Associated with orthostatic hypotension 1.

What condition is associated with DBH p.Arg343Gln (c.1028G>A)?

DBH p.Arg343Gln (c.1028G>A) is associated with orthostatic hypotension 1 (ClinVar).

How common is DBH p.Arg343Gln (c.1028G>A) in the general population?

DBH p.Arg343Gln (c.1028G>A) is ultra-rare (popmax 0.0436%, nfe) (gnomAD).

How is Dopamine beta-hydroxylase deficiency inherited?

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

What do computational predictors say about DBH p.Arg343Gln (c.1028G>A)?

AlphaMissense predicts likely benign (score 0.0875) — an in-silico prediction, not a clinical call.

DBH p.Arg343Gln

c.1028G>A · rs369664655 · VCV365656

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely benign

0.0875 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0436%, nfe)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

orthostatic hypotension 1

Computational evidence

Protein change
AlphaMissense	0.0875	likely benign
REVEL	0.187	benign-leaning
SaProt	LLR -7.66	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 4.2	GERP -0.95, phastCons 1
Regional constraint	o/e 1.00	unconstrained · MANE · 22 kb · p 0.96 · regional, not allelic
Overall
CADD	15.84	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 0.0436% European (non-Finnish) · 515/1,180,022 alleles

Filtering AF 0.0405% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0393%

Overall 0.0359% 580/1,614,160 alleles · ultra-rare

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.0436%	2,291
African / African-American	0.0373%	2,680
Remaining individualsnot grpmax-eligible	0.0256%	3,907
Admixed American	0.0233%	4,287
South Asian	0.00769%	13,011

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: DBH
Protein: p.Arg343Gln
Coding: c.1028G>A
MANE Select: NM_000787
dbSNP: rs369664655
Type: single nucleotide variant
Location: chr9:133647849 (GRCh38)
Gene constraint: LOEUF 0.936 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 90.58 · 1 PDB
Residue 343: a disulfide bond

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

Disease context

orthostatic hypotension 1 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Dopamine beta-hydroxylase deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: Adolescent, Adult, Childhood, Infancy, Neonatal

Similar variants

DBH c.339+2T>C Pathogenic ★★ same condition
DBH c.1024+6C>T Uncertain significance ★★ same condition
DBH c.486+15C>T Uncertain significance ★★ same condition
DBH c.*393C>T Uncertain significance ★★ same condition
DBH p.Ala113Ser Uncertain significance ★★ ⚠ same condition
DBH p.Ala259Val Uncertain significance ★★ ⚠ same condition
DBH p.Ala383Val Uncertain significance ★★ ⚠ same condition
DBH p.Ala506Thr Uncertain significance ★★ ⚠ 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/dbh-p-arg343gln (accessed [today's date]).

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