Is MARS1 p.Phe60= (c.180C>T) pathogenic?

MARS1 p.Phe60= (c.180C>T) is classified Likely benign in MARS1 (ClinVar, Single submitter, 1 submitter; last evaluated 2022-12-06). Very rare (popmax 0.000169%, nfe); Associated with severe early-onset pulmonary alveolar proteinosis due to MARS deficiency.

How common is MARS1 p.Phe60= (c.180C>T) in the general population?

MARS1 p.Phe60= (c.180C>T) is very rare (popmax 0.000169%, nfe) (gnomAD).

MARS1 p.Phe60=

Q: What condition is associated with MARS1 p.Phe60= (c.180C>T)?

MARS1 p.Phe60= (c.180C>T) is associated with severe early-onset pulmonary alveolar proteinosis due to MARS deficiency, Charcot-Marie-Tooth disease axonal type 2U (ClinVar).

Q: How is Severe early-onset pulmonary alveolar proteinosis due to MARS deficiency inherited?

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

c.180C>T · rs148642961 · VCV1114177

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.000169%, nfe)

Conditions

severe early-onset pulmonary alveolar proteinosis due to MARS deficiency

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP 1.4	GERP -0.17, phastCons 1
Overall
CADD	13.62	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.000169% European (non-Finnish) · 2/1,180,030 alleles

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

Overall 0.000124% 2/1,614,058 alleles · very rare exomes 2/1,461,878 · genomes 0/152,180 · 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: MARS1
Protein: p.Phe60=
Coding: c.180C>T
MANE Select: NM_004990
dbSNP: rs148642961
Type: single nucleotide variant
Location: chr12:57489089 (GRCh38)
Gene constraint: LOEUF 0.777 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 90.61 · 7 PDB

Full MARS1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

severe early-onset pulmonary alveolar proteinosis due to MARS deficiency — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: Charcot-Marie-Tooth disease axonal type 2U

For Severe early-onset pulmonary alveolar proteinosis due to MARS deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: Childhood, Infancy

Similar variants

MARS1 p.Phe60Leu Uncertain significance ★★ ⚠ same residue
MARS1 c.1293+5G>A Uncertain significance ★★ same condition
MARS1 c.1967+3A>G Uncertain significance ★★ same condition
MARS1 p.Ala160Thr Uncertain significance ★★ ⚠ same condition
MARS1 p.Ala211Thr Uncertain significance ★★ ⚠ same condition
MARS1 p.Ala261Val Uncertain significance ★★ ⚠ same condition
MARS1 p.Ala397Thr Uncertain significance ★★ ⚠ same condition
MARS1 p.Ala765Val 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/mars1-p-phe60 (accessed [today's date]).

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