Is ALDOB p.Ile103= (c.309C>T) pathogenic?

ALDOB p.Ile103= (c.309C>T) is classified Conflicting classifications of pathogenicity in ALDOB (ClinVar, Conflicting submitters, 2 submitters; last evaluated 2023-12-18). Very rare (popmax 0.00223%, eas); Associated with hereditary fructose intolerance.

What condition is associated with ALDOB p.Ile103= (c.309C>T)?

ALDOB p.Ile103= (c.309C>T) is associated with hereditary fructose intolerance (ClinVar).

How common is ALDOB p.Ile103= (c.309C>T) in the general population?

ALDOB p.Ile103= (c.309C>T) is very rare (popmax 0.00223%, eas) (gnomAD).

How is Hereditary fructose intolerance inherited?

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

ALDOB p.Ile103=

c.309C>T · rs747019279 · VCV364315

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00223%, eas)

Conditions

hereditary fructose intolerance

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 -3.7	GERP -3.9
Overall
CADD	5.26	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00223% East Asian · 1/44,866 alleles

Filtering AF 2.8e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 1.1e-05%

Overall 0.000496% 8/1,614,024 alleles · very rare

Ancestry group	Frequency	1 in
Remaining individualsnot grpmax-eligible	0.0064%	15,621
East Asiangrpmax	0.00223%	44,866
African / African-American	0.00133%	74,922
European (non-Finnish)	0.000169%	590,019

Remaining individuals 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: ALDOB
Protein: p.Ile103=
Coding: c.309C>T
MANE Select: NM_000035
dbSNP: rs747019279
Type: single nucleotide variant
Location: chr9:101429770 (GRCh38)
Gene constraint: LOEUF 1.183 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 96.12 · 4 PDB

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

Disease context

hereditary fructose intolerance — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Hereditary fructose intolerance (Orphanet):

Inheritance: Autosomal recessive
Onset: All ages
Prevalence: 1-9 / 100 000 (Europe)

Similar variants

ALDOB c.113-1G>C Pathogenic/Likely pathogenic ★★ same condition
ALDOB c.324+1G>A Pathogenic ★★ same condition
ALDOB c.324+2T>A Pathogenic ★★ same condition
ALDOB c.379+1G>A Likely pathogenic ★★ same condition
ALDOB c.379+1G>T Pathogenic/Likely pathogenic ★★ same condition
ALDOB c.380-1G>A Pathogenic/Likely pathogenic ★★ same condition
ALDOB c.380-2A>G Pathogenic/Likely pathogenic ★★ same condition
ALDOB c.625-2A>G Pathogenic/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/aldob-p-ile103 (accessed [today's date]).

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