Is DEFA6 p.Arg42His (c.125G>A) pathogenic?

DEFA6 p.Arg42His (c.125G>A) is classified Uncertain significance in DEFA6 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-03-23). AlphaMissense: likely benign (0.0935); Ultra-rare (popmax 0.0329%, mid).

How common is DEFA6 p.Arg42His (c.125G>A) in the general population?

DEFA6 p.Arg42His (c.125G>A) is ultra-rare (popmax 0.0329%, mid) (gnomAD).

What do computational predictors say about DEFA6 p.Arg42His (c.125G>A)?

AlphaMissense predicts likely benign (score 0.0935) — an in-silico prediction, not a clinical call.

DEFA6 p.Arg42His

c.125G>A · VCV4010630

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0935 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0329%, mid)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.0935	likely benign
REVEL	0.051	moderately benign-leaning
SaProt	LLR -6.05	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 -1.2	GERP -2.7
Regional constraint	o/e 1.60	unconstrained · MANE · 1,214 bp · p 4.4e-11 · regional, not allelic
Overall
CADD	13.66	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 0.0329% Middle Eastern · 2/6,084 alleles

Filtering AF 0.00702% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00652%

Overall 0.00743% 120/1,614,020 alleles · ultra-rare

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0329%	3,042
European (non-Finnish)	0.00839%	11,920
African / African-American	0.00667%	14,987
Admixed American	0.00667%	15,002
Remaining individualsnot grpmax-eligible	0.0064%	15,621
Ashkenazi Jewishnot grpmax-eligible	0.00338%	29,604
South Asian	0.00329%	30,357
East Asian	0.00223%	44,890
Finnishnot grpmax-eligible	0.00156%	64,000

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: DEFA6
Protein: p.Arg42His
Coding: c.125G>A
MANE Select: NM_001926
Type: single nucleotide variant
Location: chr8:6925911 (GRCh38)
Gene constraint: LOEUF 1.911 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 67.49 · 5 PDB

Full DEFA6 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

DEFA6 p.Arg42Cys Uncertain significance ★ ⚠ same residue
DEFA6 p.Glu35Asp Benign ★★ same type
DEFA6 p.Ala14Asp Uncertain significance ★ ⚠ same type
DEFA6 p.Ala24Thr Uncertain significance ★ ⚠ same type
DEFA6 p.Ala33Gly Uncertain significance ★ ⚠ same type
DEFA6 p.Ala38Val Uncertain significance ★ ⚠ same type
DEFA6 p.Ala57Thr Uncertain significance ★ ⚠ same type
DEFA6 p.Ala63Pro Uncertain significance ★ ⚠ same type

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/defa6-p-arg42his (accessed [today's date]).

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