Is LTBP3 p.Ala147= (c.441C>T) pathogenic?

LTBP3 p.Ala147= (c.441C>T) is classified Likely benign in LTBP3 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2026-05-14). Ultra-rare (popmax 0.0166%, mid); Associated with brachyolmia-amelogenesis imperfecta syndrome.

What condition is associated with LTBP3 p.Ala147= (c.441C>T)?

LTBP3 p.Ala147= (c.441C>T) is associated with brachyolmia-amelogenesis imperfecta syndrome (ClinVar).

How common is LTBP3 p.Ala147= (c.441C>T) in the general population?

LTBP3 p.Ala147= (c.441C>T) is ultra-rare (popmax 0.0166%, mid) (gnomAD).

LTBP3 p.Ala147=

c.441C>T · rs778638733 · VCV2054313

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0166%, mid)

Conditions

brachyolmia-amelogenesis imperfecta syndrome

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 -0.27	GERP -3.5
Overall
CADD	3.174	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0166% Middle Eastern · 1/6,014 alleles

Filtering AF 0.00594% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00454%

Overall 0.00224% 36/1,610,638 alleles · ultra-rare exomes 36/1,458,644 · genomes 0/151,994 · joint denominator

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0166%	6,014
South Asian	0.011%	9,095
Remaining individualsnot grpmax-eligible	0.00321%	31,162
East Asian	0.00223%	44,794
European (non-Finnish)	0.00187%	53,602

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: LTBP3
Protein: p.Ala147=
Coding: c.441C>T
MANE Select: NM_001130144
dbSNP: rs778638733
Type: single nucleotide variant
Location: chr11:65554271 (GRCh38)
Gene constraint: LOEUF 0.824 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 64.21

Full LTBP3 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

brachyolmia-amelogenesis imperfecta syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

LTBP3 p.Ala147Thr Uncertain significance ★★ ⚠ same residue
LTBP3 p.Ala147Val Uncertain significance ★★ ⚠ same residue
LTBP3 c.1063+1G>T Likely pathogenic ★★ same condition
LTBP3 c.3629-3C>T Uncertain significance ★★ same condition
LTBP3 c.3761-2A>G Uncertain significance ★★ same condition
LTBP3 p.Ala1149Thr Uncertain significance ★★ ⚠ same condition
LTBP3 p.Ala1153Val Uncertain significance ★★ ⚠ same condition
LTBP3 p.Ala1182Val 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/ltbp3-p-ala147 (accessed [today's date]).

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