Is NBAS p.Arg1446= (c.4338A>G) pathogenic?

NBAS p.Arg1446= (c.4338A>G) is classified Likely benign in NBAS (ClinVar, Single submitter, 1 submitter; last evaluated 2023-10-17). Very rare (popmax 0.00134%, afr).

How common is NBAS p.Arg1446= (c.4338A>G) in the general population?

NBAS p.Arg1446= (c.4338A>G) is very rare (popmax 0.00134%, afr) (gnomAD).

NBAS p.Arg1446=

c.4338A>G · rs1394641628 · VCV1984205

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00134%, afr)

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
REVEL	0.162	moderately benign-leaning
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -8.2	GERP -3.5
Overall
CADD	0.172	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00134% African / African-American · 1/74,858 alleles

Overall 6.2e-05% 1/1,613,666 alleles · very rare exomes 0/1,461,534 · genomes 1/152,132 · joint denominator

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: NBAS
Protein: p.Arg1446=
Coding: c.4338A>G
MANE Select: NM_015909
dbSNP: rs1394641628
Type: single nucleotide variant
Location: chr2:15330607 (GRCh38)
Gene constraint: LOEUF 0.761 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 74.42
Residue 1446: a UniProt-annotated variant site (in ilfs2; uncertain significance); a UniProt-annotated variant site (found in a patient with a multisystem disease involving liver, eye, immune system, connective tissue and bone; uncertain significance); a UniProt-annotated variant site (found in a patient with a multisystem disease involving liver, eye, immune system, connective tissue and bone; uncertain significance; reduced protein expression levels in fibroblasts); a UniProt-annotated variant site (found in a patient with a multisystem disease involving liver, eye, immune system, connective tissue and bone; uncertain significance; reduced collagen secretion; diffuse collagen bundles; reduced protein expression in fibroblasts); the 'interaction with zw10 and rint1' region

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

Similar variants

NBAS p.Arg1446Ter Pathogenic/Likely pathogenic ★★ same residue
NBAS p.Arg1446Gln Likely benign ★ same residue
NBAS c.1726-2A>G Likely pathogenic ★★ same type
NBAS c.173-2A>G Likely pathogenic ★★ same type
NBAS c.209+2T>G Pathogenic/Likely pathogenic ★★ same type
NBAS c.2423+404G>C Likely pathogenic ★★ same type
NBAS c.335+1G>C Pathogenic/Likely pathogenic ★★ same type
NBAS c.4461+2T>C Likely pathogenic ★★ same type

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/nbas-p-arg1446 (accessed [today's date]).

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