Is TSC2 p.Ser341= (c.1023C>T) pathogenic?

TSC2 p.Ser341= (c.1023C>T) is classified Benign/Likely benign in TSC2 (ClinVar, Multiple submitters, 3 submitters; last evaluated 2026-01-28). Very rare (popmax 8.47e-05%, nfe); Associated with hereditary neoplastic syndrome.

What condition is associated with TSC2 p.Ser341= (c.1023C>T)?

TSC2 p.Ser341= (c.1023C>T) is associated with hereditary neoplastic syndrome, tuberous sclerosis 2 (ClinVar).

How common is TSC2 p.Ser341= (c.1023C>T) in the general population?

TSC2 p.Ser341= (c.1023C>T) is very rare (popmax 8.47e-05%, nfe) (gnomAD).

TSC2 p.Ser341=

c.1023C>T · rs2086525075 · VCV1110718

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

gnomAD v4.1

Rare

very rare (popmax 8.47e-05%, nfe)

Conditions

hereditary neoplastic syndrome

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation/SpliceAI carries the signal.
Splicing
SpliceAI	Δ0.32	acceptor gain · deltas
Pangolin	Δ0.34	gain · loss 0.07 · agrees with SpliceAI · independent
Constraint at this position
Conservation	phyloP -1.6	GERP -3.7
Overall
CADD	13.96	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 8.47e-05% European (non-Finnish) · 1/1,180,020 alleles

Overall 6.84e-05% 1/1,461,838 alleles · very rare

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: TSC2
Protein: p.Ser341=
Coding: c.1023C>T
MANE Select: NM_000548
dbSNP: rs2086525075
Type: single nucleotide variant
Location: chr16:2060717 (GRCh38)
Gene constraint: LOEUF 0.203 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 68.81 · 2 PDB
Residue 341: an α-helix; the 'required for interaction with tsc1' region

Full TSC2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

hereditary neoplastic syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: tuberous sclerosis 2

Similar variants

TSC2 p.Ser341Phe Uncertain significance ★★ ⚠ same residue
TSC2 c.1257+1G>A Pathogenic ★★ same condition
TSC2 c.1258-2A>G Pathogenic ★★ same condition
TSC2 c.1361+1G>A Pathogenic/Likely pathogenic ★★ same condition
TSC2 c.1361+1G>T Pathogenic/Likely pathogenic ★★ same condition
TSC2 c.1362-1G>A Pathogenic ★★ same condition
TSC2 c.138+2T>C Pathogenic ★★ same condition
TSC2 c.138+5G>A Pathogenic/Likely pathogenic ★★ 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/tsc2-p-ser341 (accessed [today's date]).

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