Is HTT p.Ala605Ser (c.1813G>T) pathogenic?

HTT p.Ala605Ser (c.1813G>T) is classified Uncertain significance in HTT (ClinVar, Single submitter, 1 submitter; last evaluated 2020-11-24). AlphaMissense: likely benign (0.0806); Absent from gnomAD v4.1.

How common is HTT p.Ala605Ser (c.1813G>T) in the general population?

HTT p.Ala605Ser (c.1813G>T) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about HTT p.Ala605Ser (c.1813G>T)?

AlphaMissense predicts likely benign (score 0.0806) — an in-silico prediction, not a clinical call.

HTT p.Ala605Ser

c.1813G>T · rs954048883 · VCV1502934

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0806 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

0/2 damaging

AlphaMissense, REVEL · SaProt no call

Computational evidence

Protein change
AlphaMissense	0.0806	likely benign
REVEL	0.014	strongly benign-leaning
SaProt	—	not scored · why
⇒ AlphaMissense and REVEL both call this tolerated; SaProt makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -0.4	GERP -2.8
Overall
CADD	6.014	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 is an independent agreement signal.

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: HTT
Protein: p.Ala605Ser
Coding: c.1813G>T
MANE Select: NM_001045 · reported on NM_001388492
dbSNP: rs954048883
Type: single nucleotide variant
Location: chr4:3129993 (GRCh38)
Structure: AlphaFold pLDDT 85.38 · 30 PDB
Residue 605: an α-helix; a UniProt-annotated variant site (in)

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

Similar variants

SLC6A4 p.Lys605Asn Likely benign ★★ ⚠ same residue
HTT c.889+6G>T Uncertain significance ★★ same type
HTT p.Ala2739Thr Uncertain significance ★★ same type
HTT p.Arg1654Trp Uncertain significance ★★ same type
HTT p.Arg1945Trp Uncertain significance ★★ same type
HTT p.Asp1157Gly Uncertain significance ★★ same type
HTT p.Asp920Asn Uncertain significance ★★ same type
HTT p.Glu449Ala Uncertain significance ★★ ⚠ same type

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/htt-p-ala605ser (accessed [today's date]).

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