Is DBH p.Arg79Trp (c.235C>T) pathogenic?

DBH p.Arg79Trp (c.235C>T) is classified Benign/Likely benign in DBH (ClinVar, Multiple submitters, 5 submitters; last evaluated 2026-01-13). AlphaMissense: likely benign (0.109); Rare (popmax 0.208%, nfe); Associated with orthostatic hypotension 1.

What condition is associated with DBH p.Arg79Trp (c.235C>T)?

DBH p.Arg79Trp (c.235C>T) is associated with orthostatic hypotension 1 (ClinVar).

How common is DBH p.Arg79Trp (c.235C>T) in the general population?

DBH p.Arg79Trp (c.235C>T) is rare (popmax 0.208%, 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.Arg79Trp (c.235C>T)?

AlphaMissense predicts likely benign (score 0.109) — an in-silico prediction, not a clinical call.

DBH p.Arg79Trp

c.235C>T · rs77273740 · VCV365631

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 5 submitters

AlphaMissense

likely benign

0.109 · ACMG-weighted

gnomAD v4.1

Rare

rare (popmax 0.208%, nfe)

Missense predictors

1/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

orthostatic hypotension 1

Computational evidence

Protein change
AlphaMissense	0.109	likely benign
REVEL	0.463	indeterminate
SaProt	LLR -12.22	damaging
⇒ SaProt calls this damaging; AlphaMissense does not; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 2.7	GERP 1.5, phastCons 0.99
Regional constraint	o/e 1.00	unconstrained · MANE · 22 kb · p 0.96 · regional, not allelic
Overall
CADD	24.0	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.208% European (non-Finnish) · 2,456/1,180,006 alleles

Filtering AF 0.201% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.198%

Overall 0.369% 5,948/1,613,634 alleles · rare

Ancestry group	Frequency	1 in
Finnishnot grpmax-eligible	4.92%	20
Ashkenazi Jewishnot grpmax-eligible	0.5%	200
Remaining individualsnot grpmax-eligible	0.315%	317
European (non-Finnish)grpmax	0.208%	480
East Asian	0.0156%	6,411
Admixed American	0.00833%	12,006
African / African-American	0.00799%	12,508
South Asian	0.00659%	15,179

Finnish shows a higher raw frequency than the grpmax group above it. gnomAD excludes bottlenecked groups — Finnish, Ashkenazi Jewish, Amish and “Remaining individuals” — from grpmax, because founder effects make their frequencies unrepresentative for filtering. The table is sorted by frequency, so an excluded group can sit above the grpmax row.

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.Arg79Trp
Coding: c.235C>T
MANE Select: NM_000787
dbSNP: rs77273740
Type: single nucleotide variant
Location: chr9:133636606 (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 79: a β-strand; the domon domain

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 p.Arg79Gln Uncertain significance ★★ ⚠ same residue
DBH p.Arg79= Likely benign ★ same residue
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

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-arg79trp (accessed [today's date]).

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