Is DYNC2I1 p.Thr747= (c.2241C>T) pathogenic?

DYNC2I1 p.Thr747= (c.2241C>T) is classified Likely benign in DYNC2I1 (ClinVar, Single submitter, 1 submitter; last evaluated 2023-06-06). Ultra-rare (popmax 0.0165%, mid); Associated with short-rib thoracic dysplasia 8 with or without polydactyly.

What condition is associated with DYNC2I1 p.Thr747= (c.2241C>T)?

DYNC2I1 p.Thr747= (c.2241C>T) is associated with short-rib thoracic dysplasia 8 with or without polydactyly (ClinVar).

How common is DYNC2I1 p.Thr747= (c.2241C>T) in the general population?

DYNC2I1 p.Thr747= (c.2241C>T) is ultra-rare (popmax 0.0165%, mid) (gnomAD).

DYNC2I1 p.Thr747=

c.2241C>T · rs371102896 · VCV2721663

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.0165%, mid)

Conditions

short-rib thoracic dysplasia 8 with or without polydactyly

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP -2.9	GERP -3.8
Overall
CADD	0.564	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0165% Middle Eastern · 1/6,068 alleles

Filtering AF 0.00596% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00455%

Overall 0.00273% 44/1,610,732 alleles · ultra-rare exomes 39/1,458,610 · genomes 5/152,122 · joint denominator

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0165%	6,068
Finnishnot grpmax-eligible	0.0125%	7,999
South Asian	0.011%	9,077
Remaining individualsnot grpmax-eligible	0.00641%	15,590
Admixed American	0.00167%	59,718
European (non-Finnish)	0.00161%	61,984
African / African-American	0.00134%	74,848

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: DYNC2I1
Protein: p.Thr747=
Coding: c.2241C>T
MANE Select: NM_018051
dbSNP: rs371102896
Type: single nucleotide variant
Location: chr7:158923717 (GRCh38)
Gene constraint: LOEUF 0.802 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 62.87 · 4 PDB
Residue 747: a UniProt-annotated variant site (in srtd8; reduces interaction with ift proteins); a UniProt-annotated variant site (in srtd8)

Full DYNC2I1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

short-rib thoracic dysplasia 8 with or without polydactyly — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

DYNC2I1 p.Thr747Ile Uncertain significance ★ ⚠ same residue
DYNC2I1 p.Arg228Ter Pathogenic/Likely pathogenic ★★ same condition
DYNC2I1 p.Arg441Ter Pathogenic/Likely pathogenic ★★ same condition
DYNC2I1 p.Arg642Ter Pathogenic/Likely pathogenic ★★ same condition
DYNC2I1 p.Arg762Ter Pathogenic ★★ same condition
DYNC2I1 p.Ala157Val Uncertain significance ★★ ⚠ same condition
DYNC2I1 p.Ala609Val Uncertain significance ★★ ⚠ same condition
DYNC2I1 p.Ala800Thr Uncertain significance ★★ ⚠ 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/dync2i1-p-thr747 (accessed [today's date]).

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