WFS1 Wolframin — T442I Variant Card

Molecular Atlas Pilot · RareResearch.AI · Generated by wolfram-variant-card skill

Threonine → Isoleucine at position 442. Transmembrane helix 5. ClinVar Uncertain significance, AlphaMissense 0.457, DynaMut2 ΔΔG -0.83 kcal/mol (destabilising).

Identity

Structural Context

UniProt features at this position:

(none catalogued)

Position 442 sits in a transmembrane helix (Transmembrane helix 5). Wolframin has eleven such helices anchoring it in the ER membrane; substitutions inside the bilayer-embedded segments can disrupt helix packing, lipid contacts, and the overall ER topology of the protein. The wild-type residue is small polar (threonine — hydroxyl); the mutant is medium hydrophobic (isoleucine — branched). The chemistry shift implies altered local packing, hydrogen-bonding, and/or electrostatics at this site.

Computational Predictions

AlphaMissense

DynaMut2

Clinical Evidence

Inheritance and scope

Uncertain significance — for Wolfram-like syndrome (autosomal dominant, OMIM 614296); Cataract 41 (autosomal dominant, OMIM 116400); Wolfram syndrome (classic) (autosomal recessive, OMIM 222300); Nonsyndromic hearing loss (DFNA6/14/38) (autosomal dominant, OMIM 600965); WFS1-related diabetes (autosomal dominant)

ClinVar classifies this variant as Uncertain significance for Wolfram-like syndrome (autosomal dominant, OMIM 614296); Cataract 41 (autosomal dominant, OMIM 116400); Wolfram syndrome (classic) (autosomal recessive, OMIM 222300); Nonsyndromic hearing loss (DFNA6/14/38) (autosomal dominant, OMIM 600965); WFS1-related diabetes (autosomal dominant). These are two clinically distinct disease families: classic Wolfram syndrome requires two affected copies, while the dominant WFS1-related disorders do not. One label covers both, and it does not tell you which applies to a given person.

Phenotype scope is interpretation of submitted records. The computed values on this card (AlphaMissense, DynaMut2 ΔΔG, pLDDT) are measurements of the model, not of a patient. Presentation cannot be generalised from neighbouring variants: one nucleotide over can present very differently. Structural similarity supports a mechanistic hypothesis, never a phenotype claim.

• Wolfram-like syndrome
• Cataract 41
• Wolfram syndrome 1
• Autosomal dominant nonsyndromic hearing loss 6
• Type 2 diabetes mellitus

Research Path Decision Tree

ΔΔG < 2  + binding site affected   →  CATEGORY 3 — docking experiments
ΔΔG 2–4                            →  CATEGORY 2 — pharmacological chaperones
ΔΔG > 4                            →  CATEGORY 1 — gene therapy
pLDDT < 50                         →  CATEGORY 5 — IDR, experimental only
Stable fold + functional site hit  →  CATEGORY 4 — site-specific docking

Final Schema Categorization

Category 4 — Stable Fold, Function Disrupted

<strong>Category 4 — Stable Fold, Function Disrupted</strong><br/><br/>|ΔΔG|=0.83 negligible. Likely site-specific functional disruption — docking strategy.

Why this card matters. Wolframin's fold survives this substitution (|ΔΔG|=0.83 kcal/mol). The pathogenic signal is real — AlphaMissense places it at 0.457. Protein still folds, but a specific local site is broken. Pharmacological chaperones and small-molecule binders are the rational therapeutic vector.

Files in this folder

• AF-O76024-F1-model_v6.pdb — AlphaFold structure
• T442I_molstar_viewer.html — interactive 3D viewer (auto-highlights position 442 with ball-and-stick + neighbors within 5Å)
• T442I_variant_card.md — this card (source of truth)
• T442I_variant_card.html — styled printable card
• T442I_dynamut2_summary.html — clean offline DynaMut2 result card
• dynamut2_result.json — structured result data
• dynamut2_result_page.html — local snapshot of the Biosig result page (asset URLs absolutized)
• T442I_wildtype_interactions.pse / T442I_mutant_interactions.pse — PyMOL sessions

Generated by wolfram-variant-card skill · RareResearch.AI Molecular Atlas Every assumption documented. Every score sourced.