Is MYO7A p.Pro1221Arg (c.3662C>G) pathogenic?

MYO7A p.Pro1221Arg (c.3662C>G) is classified Conflicting classifications of pathogenicity in MYO7A (ClinVar, Conflicting submitters, 5 submitters; last evaluated 2025-12-30). AlphaMissense: ambiguous (0.4638); Very rare (popmax 0.00188%, amr); Associated with autosomal recessive nonsyndromic hearing loss 2.

What condition is associated with MYO7A p.Pro1221Arg (c.3662C>G)?

MYO7A p.Pro1221Arg (c.3662C>G) is associated with autosomal recessive nonsyndromic hearing loss 2, Usher syndrome type 1, autosomal dominant nonsyndromic hearing loss 11 (ClinVar).

How common is MYO7A p.Pro1221Arg (c.3662C>G) in the general population?

MYO7A p.Pro1221Arg (c.3662C>G) is very rare (popmax 0.00188%, amr) (gnomAD).

What do computational predictors say about MYO7A p.Pro1221Arg (c.3662C>G)?

AlphaMissense predicts ambiguous (score 0.4638) — an in-silico prediction, not a clinical call.

MYO7A p.Pro1221Arg

c.3662C>G · rs780594308 · VCV306183

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 5 submitters

AlphaMissense

ambiguous

0.4638 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00188%, amr)

Missense predictors

1/2 damaging

REVEL, SaProt · AlphaMissense no call

Conditions

autosomal recessive nonsyndromic hearing loss 2

Computational evidence

Protein change
AlphaMissense	0.4638	ambiguous
REVEL	0.68	pathogenic-leaning
SaProt	LLR -5.56	tolerated
⇒ REVEL calls this damaging; SaProt does not; AlphaMissense makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 4.8	GERP 1.8, phastCons 0.99
Regional constraint	o/e 0.95	unconstrained · MANE · 84 kb · p 0.0065 · regional, not allelic
Overall
CADD	23.7	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 0.00188% Admixed American · 1/53,204 alleles

Filtering AF 0.000127% ClinGen BA1/BS1 input FAF95, joint · FAF99 9.2e-05%

Overall 0.00376% 59/1,567,282 alleles · very rare exomes 55/1,415,060 · genomes 4/152,222 · joint denominator

Ancestry group	Frequency	1 in
Ashkenazi Jewishnot grpmax-eligible	0.173%	577
Remaining individualsnot grpmax-eligible	0.00494%	20,243
Admixed Americangrpmax	0.00188%	53,204
European (non-Finnish)	0.000432%	231,333

Ashkenazi Jewish 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.Pro1221Arg
Coding: c.3662C>G
MANE Select: NM_000260
dbSNP: rs780594308
Type: single nucleotide variant
Location: chr11:77190051 (GRCh38)
Gene constraint: LOEUF 0.995 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 77.73 · 1 PDB
Residue 1221: the myth4 1 domain

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

Disease context

autosomal recessive nonsyndromic hearing loss 2 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: Usher syndrome type 1 autosomal dominant nonsyndromic hearing loss 11

Similar variants

MYO7A p.Pro1221fs Pathogenic ★ same residue
MYO7A p.Pro1221= 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-pro1221arg (accessed [today's date]).

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