Is TMPO p.Lys148Arg (c.443A>G) pathogenic?

TMPO p.Lys148Arg (c.443A>G) is classified Uncertain significance in TMPO (ClinVar, Single submitter, 1 submitter; last evaluated 2021-09-01). AlphaMissense: likely benign (0.2026); Very rare (popmax 0.00133%, afr); Associated with Loeys-Dietz syndrome 2.

What condition is associated with TMPO p.Lys148Arg (c.443A>G)?

TMPO p.Lys148Arg (c.443A>G) is associated with Loeys-Dietz syndrome 2 (ClinVar).

How common is TMPO p.Lys148Arg (c.443A>G) in the general population?

TMPO p.Lys148Arg (c.443A>G) is very rare (popmax 0.00133%, afr) (gnomAD).

What do computational predictors say about TMPO p.Lys148Arg (c.443A>G)?

AlphaMissense predicts likely benign (score 0.2026) — an in-silico prediction, not a clinical call.

TMPO p.Lys148Arg

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.443A>G · rs2121195483 · VCV1470659

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.2026 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00133%, afr)

Missense predictors

0/2 damaging

AlphaMissense, SaProt · REVEL indeterminate

Conditions

Loeys-Dietz syndrome 2

Computational evidence

Protein change
AlphaMissense	0.2026	likely benign
REVEL	0.333	indeterminate
SaProt	LLR -8.15	tolerated
⇒ AlphaMissense and SaProt both call this tolerated; REVEL is indeterminate.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 9.3	GERP 1.4, phastCons 1
Regional constraint	o/e 1.01	unconstrained · MANE · 28 kb · p 0.89 · regional, not allelic
Overall
CADD	26.1	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00133% African / African-American · 1/75,014 alleles

Overall 6.2e-05% 1/1,613,260 alleles · very rare exomes 1/1,460,974 · genomes 0/152,286 · 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: TMPO
Protein: p.Lys148Arg
Coding: c.443A>G
MANE Select: NM_001032283
dbSNP: rs2121195483
Type: single nucleotide variant
Location: chr12:98531716 (GRCh38)
Gene constraint: LOEUF 0.736 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 60.49 · 14 PDB
Residue 148: the lem domain; an α-helix; the 'nakap95-binding n' region; the 'nucleoplasmic' region

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

Similar variants

TMPO p.Lys148fs Uncertain significance ★ same residue
TMPO c.565+1005A>G Uncertain significance ★★ ⚠ same condition
TMPO c.565+1009T>C Uncertain significance ★★ ⚠ same condition
TMPO c.565+1012A>C Uncertain significance ★★ ⚠ same condition
TMPO c.565+1017A>G Uncertain significance ★★ ⚠ same condition
TMPO c.565+1026A>G Uncertain significance ★★ ⚠ same condition
TMPO c.565+1029G>T Uncertain significance ★★ ⚠ same condition
TMPO c.565+1048G>C 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/tmpo-p-lys148arg (accessed [today's date]).

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