Is AMT p.Thr206= (c.618C>T) pathogenic?

AMT p.Thr206= (c.618C>T) is classified Likely benign in AMT (ClinVar, Single submitter, 1 submitter; last evaluated 2023-10-15). Very rare (popmax 0.00167%, amr); Associated with glycine encephalopathy.

What condition is associated with AMT p.Thr206= (c.618C>T)?

AMT p.Thr206= (c.618C>T) is associated with glycine encephalopathy (ClinVar).

How common is AMT p.Thr206= (c.618C>T) in the general population?

AMT p.Thr206= (c.618C>T) is very rare (popmax 0.00167%, amr) (gnomAD).

How is Glycine encephalopathy inherited?

Typically Autosomal recessive (Orphanet). A genetic counselor can assess individual risk for a family.

AMT p.Thr206=

c.618C>T · rs1361089893 · VCV1618633

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00167%, amr)

Conditions

glycine encephalopathy

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	all four deltas below 0.2 · G>C here scores Δ0.29 · evaluated, not missing
Constraint at this position
Conservation	phyloP 3	GERP -1.2, phastCons 1
Overall
CADD	9.321	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00167% Admixed American · 1/59,986 alleles

Overall 0.000124% 2/1,614,050 alleles · very rare

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.00167%	59,986
European (non-Finnish)	8.47e-05%	1,180,034

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: AMT
Protein: p.Thr206=
Coding: c.618C>T
MANE Select: NM_000481
dbSNP: rs1361089893
Type: single nucleotide variant
Location: chr3:49419338 (GRCh38)
Gene constraint: LOEUF 0.805 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 93.66 · 2 PDB
Residue 206: a β-strand

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

Disease context

glycine encephalopathy — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Glycine encephalopathy (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal
Prevalence: 1-9 / 1 000 000 (Europe)

Similar variants

AMT c.339+2T>C Likely pathogenic ★★ same condition
AMT c.471+2T>C Pathogenic ★★ same condition
AMT c.697-1G>A Likely pathogenic ★★ same condition
AMT c.878-1G>A Pathogenic ★★ same condition
AMT c.91-2A>G Likely pathogenic ★★ same condition
AMT c.-58C>T Pathogenic/Likely pathogenic ★★ same condition
AMT p.Arg222Cys Pathogenic ★★ same condition
AMT p.Arg265Cys 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/amt-p-thr206 (accessed [today's date]).

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