Is LFNG p.Pro103Ala (c.307C>G) pathogenic?

LFNG p.Pro103Ala (c.307C>G) is classified Uncertain significance in LFNG (ClinVar, Single submitter, 1 submitter; last evaluated 2020-08-08). AlphaMissense: likely benign (0.0602); No allele count reported in gnomAD v4.1 (AN 1,527,104); Associated with spondylocostal dysostosis 3, autosomal recessive.

What condition is associated with LFNG p.Pro103Ala (c.307C>G)?

LFNG p.Pro103Ala (c.307C>G) is associated with spondylocostal dysostosis 3, autosomal recessive (ClinVar).

How common is LFNG p.Pro103Ala (c.307C>G) in the general population?

LFNG p.Pro103Ala (c.307C>G) is no allele count reported in gnomAD v4.1 (AN 1,527,104) (gnomAD).

What do computational predictors say about LFNG p.Pro103Ala (c.307C>G)?

AlphaMissense predicts likely benign (score 0.0602) — an in-silico prediction, not a clinical call.

LFNG p.Pro103Ala

c.307C>G · rs778333281 · VCV1018847

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0602 · ACMG-weighted

gnomAD v4.1

Not reported

no allele count reported in gnomAD v4.1 (AN 1,527,104)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

spondylocostal dysostosis 3, autosomal recessive

Computational evidence

Protein change
AlphaMissense	0.0602	likely benign
REVEL	0.048	moderately benign-leaning
SaProt	LLR -5.93	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.51	GERP -0.23
Regional constraint	o/e 1.01	unconstrained · MANE · 5,828 bp · p 0.78 · regional, not allelic
Overall
CADD	17.5	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

No allele count reported in gnomAD v4.1 (AN 1,527,104). This is missing data, not an absence: the variant may or may not be present in gnomAD. Rarity (ACMG PM2) and BA1/BS1 cannot be assessed for it.

Variant & gene context

Gene: LFNG
Protein: p.Pro103Ala
Coding: c.307C>G
MANE Select: NM_001040167
dbSNP: rs778333281
Type: single nucleotide variant
Location: chr7:2520168 (GRCh38)
Gene constraint: LOEUF 0.755 · pLI 0.02 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 83.66
Residue 103: the 'disordered' region

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

Disease context

spondylocostal dysostosis 3, autosomal recessive — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

LFNG p.Pro103Leu Uncertain significance ★ ⚠ same residue
LFNG p.Thr145Met Likely pathogenic ★★ same condition
LFNG c.482-3C>T Uncertain significance ★★ same condition
LFNG p.Ala95Val Uncertain significance ★★ ⚠ same condition
LFNG p.Ala99Thr Uncertain significance ★★ ⚠ same condition
LFNG p.Arg187Cys Uncertain significance ★★ ⚠ same condition
LFNG p.Arg239Trp Uncertain significance ★★ ⚠ same condition
LFNG p.Arg246His 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/lfng-p-pro103ala (accessed [today's date]).

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