Is UNC13D p.Thr299= (c.897C>T) pathogenic?

UNC13D p.Thr299= (c.897C>T) is classified Likely benign in UNC13D (ClinVar, Single submitter, 1 submitter; last evaluated 2024-07-15). Very rare (popmax 0.00167%, amr); Associated with familial hemophagocytic lymphohistiocytosis 3.

What condition is associated with UNC13D p.Thr299= (c.897C>T)?

UNC13D p.Thr299= (c.897C>T) is associated with familial hemophagocytic lymphohistiocytosis 3 (ClinVar).

How common is UNC13D p.Thr299= (c.897C>T) in the general population?

UNC13D p.Thr299= (c.897C>T) is very rare (popmax 0.00167%, amr) (gnomAD).

How is Familial hemophagocytic lymphohistiocytosis inherited?

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

UNC13D p.Thr299=

c.897C>T · rs771228394 · VCV1127136

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

familial hemophagocytic lymphohistiocytosis 3

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -20
Overall
CADD	0.458	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00167% Admixed American · 1/59,996 alleles

Filtering AF 0.000763% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000605%

Overall 0.00105% 17/1,613,386 alleles · very rare exomes 15/1,461,180 · genomes 2/152,206 · joint denominator

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.00167%	59,996
European (non-Finnish)	0.00127%	78,664
South Asian	0.0011%	91,066

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: UNC13D
Protein: p.Thr299=
Coding: c.897C>T
MANE Select: NM_199242
dbSNP: rs771228394
Type: single nucleotide variant
Location: chr17:75840072 (GRCh38)
Gene constraint: LOEUF 0.923 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 85.04 · 1 PDB
Residue 299: the 'interaction with rab27a' region

Full UNC13D gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

familial hemophagocytic lymphohistiocytosis 3 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Familial hemophagocytic lymphohistiocytosis (Orphanet):

Inheritance: Autosomal recessive
Onset: Adolescent, Infancy
Prevalence: 1-9 / 100 000 (Sweden)

Similar variants

UNC13D p.Thr299Pro Uncertain significance ★ ⚠ same residue
UNC13D c.1055+1G>A Pathogenic/Likely pathogenic ★★ same condition
UNC13D c.118-307G>A Pathogenic ★★ same condition
UNC13D c.118-308C>T Pathogenic/Likely pathogenic ★★ same condition
UNC13D c.1389+1G>A Pathogenic ★★ same condition
UNC13D c.1596+1G>C Pathogenic ★★ same condition
UNC13D c.1727+1G>A Pathogenic/Likely pathogenic ★★ same condition
UNC13D c.1848+1G>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/unc13d-p-thr299 (accessed [today's date]).

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