Is MYO7A p.Arg634Ter (c.1900C>T) pathogenic?

MYO7A p.Arg634Ter (c.1900C>T) is classified Pathogenic/Likely pathogenic in MYO7A (ClinVar, Multiple submitters, 10 submitters; last evaluated 2025-03-20). Very rare (popmax 0.00119%, sas); Associated with MYO7A-related disorder.

What condition is associated with MYO7A p.Arg634Ter (c.1900C>T)?

MYO7A p.Arg634Ter (c.1900C>T) is associated with MYO7A-related disorder, Usher syndrome type 1, autosomal recessive nonsyndromic hearing loss 2 (ClinVar).

How common is MYO7A p.Arg634Ter (c.1900C>T) in the general population?

MYO7A p.Arg634Ter (c.1900C>T) is very rare (popmax 0.00119%, sas) (gnomAD).

MYO7A p.Arg634Ter

c.1900C>T · rs111033180 · VCV43164

Pathogenic/Likely pathogenic Multiple submitters

Classification

Pathogenic/Likely pathogenic

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 10 submitters

Consequence

nonsense (stop-gain)

predicted LoF

gnomAD v4.1

Rare

very rare (popmax 0.00119%, sas)

Conditions

MYO7A-related disorder

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Consequence	nonsense (stop-gain)	predicted loss-of-function
NMD	predicted	premature termination codon in exon 16 of 49
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 5.9	GERP 0.67, phastCons 1
Overall
CADD	43.0	PHRED · no single calibrated threshold — expert panels disagree

Predicted loss-of-function is descriptive, not an applied PVS1 code.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00119% South Asian · 1/84,070 alleles

Filtering AF 0.000441% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000321%

Overall 0.000773% 12/1,552,046 alleles · very rare exomes 10/1,399,830 · genomes 2/152,216 · joint denominator

Ancestry group	Frequency	1 in
Finnishnot grpmax-eligible	0.00167%	59,862
South Asiangrpmax	0.00119%	84,070
European (non-Finnish)	0.000872%	114,733

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: MYO7A
Protein: p.Arg634Ter
Coding: c.1900C>T
MANE Select: NM_000260
dbSNP: rs111033180
Type: single nucleotide variant
Location: chr11:77172850 (GRCh38)
Gene constraint: LOEUF 0.995 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 77.73 · 1 PDB
Residue 634: the myosin motor domain; the 'actin-binding' region

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

Disease context

MYO7A-related disorder

Also linked: Usher syndrome type 1 autosomal recessive nonsyndromic hearing loss 2 autosomal dominant nonsyndromic hearing loss 11 inherited retinal dystrophy Usher syndrome type 1B

Similar variants

MYO7A p.Arg634Gln Uncertain significance ★★ ⚠ same residue
MYO7A p.Arg634= 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
MYO7A p.Arg668Cys Pathogenic ★★★ same condition
MYO7A p.Arg853His 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-arg634ter (accessed [today's date]).

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