Is MEGF10 p.Val33= (c.99G>A) pathogenic?

MEGF10 p.Val33= (c.99G>A) is classified Likely benign in MEGF10 (ClinVar, Single submitter, 1 submitter; last evaluated 2019-03-07). Very rare (popmax 0.00134%, afr); Associated with MEGF10-related myopathy.

What condition is associated with MEGF10 p.Val33= (c.99G>A)?

MEGF10 p.Val33= (c.99G>A) is associated with MEGF10-related myopathy (ClinVar).

How common is MEGF10 p.Val33= (c.99G>A) in the general population?

MEGF10 p.Val33= (c.99G>A) is very rare (popmax 0.00134%, afr) (gnomAD).

MEGF10 p.Val33=

Q: How is Early-onset myopathy-areflexia-respiratory distress-dysphagia syndrome inherited?

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

c.99G>A · rs1204696743 · VCV1094109

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00134%, afr)

Conditions

MEGF10-related myopathy

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation/SpliceAI carries the signal.
Splicing
SpliceAI	Δ0.65	donor gain · deltas
Pangolin	Δ0.48	gain · loss 0.23 · agrees with SpliceAI · independent
Constraint at this position
Conservation	phyloP 0.92	GERP 1, phastCons 1
Overall
CADD	17.36	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00134% African / African-American · 1/74,654 alleles

Filtering AF 0.000248% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00016%

Overall 0.000498% 8/1,605,786 alleles · very rare exomes 7/1,453,608 · genomes 1/152,178 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00134%	74,654
European (non-Finnish)	0.000596%	167,654

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: MEGF10
Protein: p.Val33=
Coding: c.99G>A
MANE Select: NM_001256545
dbSNP: rs1204696743
Type: single nucleotide variant
Location: chr5:127331407 (GRCh38)
Gene constraint: LOEUF 0.707 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 70.73
Residue 33: the 'necessary for interaction with ap2m1, self-assembly and formation of the irregular, mosaic-like adhesion pattern' region; the emi domain

Full MEGF10 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

MEGF10-related myopathy — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Early-onset myopathy-areflexia-respiratory distress-dysphagia syndrome (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal

Similar variants

MEGF10 c.2104+1G>T Likely pathogenic ★★ same condition
MEGF10 p.Cys774Arg Pathogenic/Likely pathogenic ★★ same condition
MEGF10 p.Glu398Ter Pathogenic/Likely pathogenic ★★ same condition
MEGF10 c.1426+5G>T Uncertain significance ★★ same condition
MEGF10 c.*1170G>A Uncertain significance ★★ same condition
MEGF10 p.Ala171Thr Uncertain significance ★★ ⚠ same condition
MEGF10 p.Ala171Val Uncertain significance ★★ ⚠ same condition
MEGF10 p.Ala219Val 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/megf10-p-val33 (accessed [today's date]).

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