Is DYNC2I1 p.Pro664= (c.1992C>T) pathogenic?

DYNC2I1 p.Pro664= (c.1992C>T) is classified Likely benign in DYNC2I1 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-03-03). Very rare (popmax 0.00439%, sas); Associated with short-rib thoracic dysplasia 8 with or without polydactyly.

What condition is associated with DYNC2I1 p.Pro664= (c.1992C>T)?

DYNC2I1 p.Pro664= (c.1992C>T) is associated with short-rib thoracic dysplasia 8 with or without polydactyly (ClinVar).

How common is DYNC2I1 p.Pro664= (c.1992C>T) in the general population?

DYNC2I1 p.Pro664= (c.1992C>T) is very rare (popmax 0.00439%, sas) (gnomAD).

DYNC2I1 p.Pro664=

c.1992C>T · rs368787425 · VCV1961693

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00439%, sas)

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 -5.1	GERP -4.3
Overall
CADD	0.567	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00439% South Asian · 4/91,088 alleles

Filtering AF 0.00259% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00233%

Overall 0.0031% 50/1,613,890 alleles · very rare exomes 48/1,461,710 · genomes 2/152,180 · joint denominator

Ancestry group	Frequency	1 in
South Asiangrpmax	0.00439%	22,772
European (non-Finnish)	0.00347%	28,778
Remaining individualsnot grpmax-eligible	0.0032%	31,233
African / African-American	0.00267%	37,454
Finnishnot grpmax-eligible	0.00156%	64,018

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.Pro664=
Coding: c.1992C>T
MANE Select: NM_018051
dbSNP: rs368787425
Type: single nucleotide variant
Location: chr7:158922447 (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 664: 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.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
DYNC2I1 p.Ala822Thr 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-pro664 (accessed [today's date]).

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