Is MYO7A p.Arg378His (c.1133G>A) pathogenic?

MYO7A p.Arg378His (c.1133G>A) is classified Uncertain significance in MYO7A (ClinVar, Multiple submitters, 6 submitters; last evaluated 2025-03-18). AlphaMissense: likely pathogenic (0.6125); Ultra-rare (popmax 0.0117%, eas); Associated with Usher syndrome type 1.

What condition is associated with MYO7A p.Arg378His (c.1133G>A)?

MYO7A p.Arg378His (c.1133G>A) is associated with Usher syndrome type 1, autosomal recessive nonsyndromic hearing loss 2, Usher syndrome type 1B (ClinVar).

How common is MYO7A p.Arg378His (c.1133G>A) in the general population?

MYO7A p.Arg378His (c.1133G>A) is ultra-rare (popmax 0.0117%, eas) (gnomAD).

How is Usher syndrome inherited?

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

What do computational predictors say about MYO7A p.Arg378His (c.1133G>A)?

AlphaMissense predicts likely pathogenic (score 0.6125) — an in-silico prediction, not a clinical call.

MYO7A p.Arg378His

c.1133G>A · rs397516282 · VCV43136

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 6 submitters

AlphaMissense

likely pathogenic

0.6125 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0117%, eas)

Missense predictors

1/2 damaging

AlphaMissense, SaProt · REVEL indeterminate

Conditions

Usher syndrome type 1

Computational evidence

Protein change
AlphaMissense	0.6125	likely pathogenic
REVEL	0.599	indeterminate
SaProt	LLR -9.65	tolerated
⇒ AlphaMissense calls this damaging; SaProt does not; REVEL is indeterminate.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP 12	GERP 1.6, phastCons 1
Regional constraint	o/e 0.95	unconstrained · MANE · 84 kb · p 0.0065 · regional, not allelic
Overall
CADD	25.7	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 0.0117% East Asian · 5/42,796 alleles

Filtering AF 0.00452% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00297%

Overall 0.00379% 60/1,581,594 alleles · ultra-rare exomes 53/1,429,306 · genomes 7/152,288 · joint denominator

Ancestry group	Frequency	1 in
Remaining individualsnot grpmax-eligible	0.013%	7,663
East Asiangrpmax	0.0117%	8,559
European (non-Finnish)	0.00369%	27,079
Admixed American	0.00359%	27,880
South Asian	0.00233%	42,961

Remaining individuals 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: MYO7A
Protein: p.Arg378His
Coding: c.1133G>A
MANE Select: NM_000260
dbSNP: rs397516282
Type: single nucleotide variant
Location: chr11:77160215 (GRCh38)
Gene constraint: LOEUF 0.995 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 77.73 · 1 PDB
Residue 378: the myosin motor domain

Full MYO7A gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Usher syndrome type 1 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: autosomal recessive nonsyndromic hearing loss 2 Usher syndrome type 1B

For Usher syndrome (Orphanet):

Inheritance: Autosomal recessive
Onset: Childhood, Infancy, Neonatal
Prevalence: 1-9 / 100 000 (Worldwide)

Similar variants

MYO7A p.Arg378Cys Conflicting classifications of pathogenicity ★ ⚠ same residue
MYO7A p.Arg378Leu Uncertain significance ★ ⚠ same residue
MYO7A p.Arg378Pro Uncertain significance ★ ⚠ same residue
MYO7A p.Arg378= Likely benign ★ same residue
MYO7A p.Ala1288Pro Likely pathogenic ★★★ same condition
MYO7A p.Arg1168Gln Pathogenic ★★★ ⚠ same condition
MYO7A p.Arg1873Gln Pathogenic ★★★ ⚠ same condition
MYO7A p.Arg395Cys Likely 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/myo7a-p-arg378his (accessed [today's date]).

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