Is CD6 p.Ser620Thr (c.1859G>C) pathogenic?

CD6 p.Ser620Thr (c.1859G>C) is classified Uncertain significance in CD6 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-10-24). AlphaMissense: likely benign (0.1378); Ultra-rare (popmax 0.0357%, mid).

How common is CD6 p.Ser620Thr (c.1859G>C) in the general population?

CD6 p.Ser620Thr (c.1859G>C) is ultra-rare (popmax 0.0357%, mid) (gnomAD).

What do computational predictors say about CD6 p.Ser620Thr (c.1859G>C)?

AlphaMissense predicts likely benign (score 0.1378) — an in-silico prediction, not a clinical call.

CD6 p.Ser620Thr

c.1859G>C · VCV4650671

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1378 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0357%, mid)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.1378	likely benign
REVEL	0.225	benign-leaning
SaProt	LLR -7.40	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 7.5	GERP 0.48, phastCons 1
Regional constraint	o/e 0.86	unconstrained · MANE · 47 kb · p 2.2e-05 · regional, not allelic
Overall
CADD	23.8	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

Grpmax group 0.0357% Middle Eastern · 2/5,606 alleles

Filtering AF 0.00626% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00268%

Overall 0.00317% 51/1,606,538 alleles · ultra-rare exomes 49/1,454,332 · genomes 2/152,206 · joint denominator

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0357%	2,803
European (non-Finnish)	0.00391%	25,584
African / African-American	0.00267%	37,387
Remaining individualsnot grpmax-eligible	0.00161%	62,124

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: CD6
Protein: p.Ser620Thr
Coding: c.1859G>C
MANE Select: NM_006725
Type: single nucleotide variant
Location: chr11:61018310 (GRCh38)
Gene constraint: LOEUF 1.03 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 66.14 · 1 PDB
Residue 620: the 'disordered' region

Full CD6 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

CD6 p.Ala151Val Uncertain significance ★ ⚠ same type
CD6 p.Ala160Val Uncertain significance ★ ⚠ same type
CD6 p.Ala22Asp Uncertain significance ★ ⚠ same type
CD6 p.Ala235Thr Uncertain significance ★ ⚠ same type
CD6 p.Ala311Glu Uncertain significance ★ ⚠ same type
CD6 p.Ala431Asp Uncertain significance ★ ⚠ same type
CD6 p.Ala78Thr Uncertain significance ★ ⚠ same type
CD6 p.Arg220Ser 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/cd6-p-ser620thr (accessed [today's date]).

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