Is MANBA p.Arg851= (c.2553A>G) pathogenic?

MANBA p.Arg851= (c.2553A>G) is classified Likely benign in MANBA (ClinVar, Single submitter, 1 submitter; last evaluated 2023-08-16). Absent from gnomAD v4.1; Associated with beta-mannosidosis.

What condition is associated with MANBA p.Arg851= (c.2553A>G)?

MANBA p.Arg851= (c.2553A>G) is associated with beta-mannosidosis (ClinVar).

How common is MANBA p.Arg851= (c.2553A>G) in the general population?

MANBA p.Arg851= (c.2553A>G) is absent from gnomAD v4.1 (gnomAD).

How is Beta-mannosidosis inherited?

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

MANBA p.Arg851=

c.2553A>G · rs2476704490 · VCV2832776

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Absent

absent from gnomAD v4.1

Conditions

beta-mannosidosis

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 -1.1	GERP -5
Overall
CADD	2.486	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: MANBA
Protein: p.Arg851=
Coding: c.2553A>G
MANE Select: NM_005908
dbSNP: rs2476704490
Type: single nucleotide variant
Location: chr4:102632144 (GRCh38)
Gene constraint: LOEUF 0.826 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 96.05
Residue 851: a UniProt-annotated variant site (in mansb; complete loss of enzyme activity)

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

Disease context

beta-mannosidosis — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Beta-mannosidosis (Orphanet):

Inheritance: Autosomal recessive
Onset: Adolescent, Adult, Childhood, Infancy, Neonatal
Prevalence: 1-9 / 1 000 000 (Europe)

Similar variants

MANBA p.Arg851Ter Uncertain significance ★ same residue
MANBA p.Arg851Gly Uncertain significance ★ ⚠ same residue
MANBA c.1112+1G>T Likely pathogenic ★★ same condition
MANBA c.1231-1G>A Likely pathogenic ★★ same condition
MANBA c.1704+1G>T Likely pathogenic ★★ same condition
MANBA c.2158-2A>G Pathogenic ★★ same condition
MANBA c.273-1G>A Likely pathogenic ★★ same condition
MANBA c.378+1G>A 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/manba-p-arg851 (accessed [today's date]).

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