Is NEB p.Pro3423= (c.10269G>A) pathogenic?

NEB p.Pro3423= (c.10269G>A) is classified Benign/Likely benign in NEB (ClinVar, Multiple submitters, 5 submitters; last evaluated 2026-01-13). Rare (popmax 0.349%, afr); Associated with nemaline myopathy 2.

What condition is associated with NEB p.Pro3423= (c.10269G>A)?

NEB p.Pro3423= (c.10269G>A) is associated with nemaline myopathy 2 (ClinVar).

How common is NEB p.Pro3423= (c.10269G>A) in the general population?

NEB p.Pro3423= (c.10269G>A) is rare (popmax 0.349%, afr) (gnomAD).

How is Severe congenital nemaline myopathy inherited?

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

NEB p.Pro3423=

c.10269G>A · rs368719373 · VCV465429

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 5 submitters

gnomAD v4.1

Rare

rare (popmax 0.349%, afr)

Conditions

nemaline myopathy 2

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -9.2	GERP -4.5
Overall
CADD	6.065	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.349% African / African-American · 262/75,008 alleles

Filtering AF 0.315% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.301%

Overall 0.0195% 314/1,613,870 alleles · rare exomes 165/1,461,682 · genomes 149/152,188 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.349%	286
Admixed American	0.0283%	3,530
Remaining individualsnot grpmax-eligible	0.016%	6,249
South Asian	0.00549%	18,215
European (non-Finnish)	0.0017%	58,993

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: NEB
Protein: p.Pro3423=
Coding: c.10269G>A
MANE Select: NM_001164508
dbSNP: rs368719373
Type: single nucleotide variant
Location: chr2:151627080 (GRCh38)
Gene constraint: LOEUF 0.597 · pLI <0.01 (gnomAD)
Residue 3423: a UniProt-annotated variant site (in amc6)

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

Disease context

nemaline myopathy 2 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Severe congenital nemaline myopathy (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal
Prevalence: <1 / 1 000 000 (Europe)

Similar variants

NEB p.Pro3423Leu Uncertain significance ★★ ⚠ same residue
NEB c.11910+1G>A Likely pathogenic ★★★ same condition
NEB c.6076-1G>T Likely pathogenic ★★★ same condition
NEB c.78+1G>A Pathogenic ★★★ same condition
NEB p.Arg2313Ter Pathogenic ★★★ same condition
NEB p.Asp498Gly Likely pathogenic ★★★ ⚠ same condition
NEB p.Ser6366Ile Pathogenic ★★★ same condition
NEB p.Ser6648= 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/neb-p-pro3423 (accessed [today's date]).

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