Is TMPO p.Ala90= (c.270C>G) pathogenic?

TMPO p.Ala90= (c.270C>G) is classified Likely benign in TMPO (ClinVar, Multiple submitters, 2 submitters; last evaluated 2026-05-23). Very rare (popmax 0.00736%, afr); Associated with Loeys-Dietz syndrome 2.

What condition is associated with TMPO p.Ala90= (c.270C>G)?

TMPO p.Ala90= (c.270C>G) is associated with Loeys-Dietz syndrome 2 (ClinVar).

How common is TMPO p.Ala90= (c.270C>G) in the general population?

TMPO p.Ala90= (c.270C>G) is very rare (popmax 0.00736%, afr) (gnomAD).

TMPO p.Ala90=

Q: How is Familial thoracic aortic aneurysm and aortic dissection inherited?

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

c.270C>G · rs538702194 · VCV1549837

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00736%, afr)

Conditions

Loeys-Dietz syndrome 2

⚠ Built without this gene's context — gene constraint and dosage, protein structure, pathways, panels and related-variant links were not looked up for this page. why

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not looked up on this page · why
Constraint at this position
Conservation	phyloP 0.11	GERP -1.2, phastCons 0.87
Overall
CADD	16.27	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00736% African / African-American · 5/67,964 alleles

Filtering AF 0.00285% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00186%

Overall 0.000751% 11/1,465,084 alleles · very rare exomes 5/1,312,790 · genomes 6/152,294 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00736%	13,593
East Asian	0.0052%	19,213
Admixed American	0.0027%	37,068
European (non-Finnish)	0.000268%	372,796

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: TMPO
Protein: p.Ala90=
Coding: c.270C>G
MANE Select: NM_001032283
dbSNP: rs538702194
Type: single nucleotide variant
Location: chr12:98516137 (GRCh38)

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

Disease context

Loeys-Dietz syndrome 2 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Familial thoracic aortic aneurysm and aortic dissection (Orphanet):

Inheritance: Autosomal dominant
Onset: Adolescent, Adult, Childhood

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/tmpo-p-ala90 (accessed [today's date]).

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