TTC21B

Chr 2ADAR

tetratricopeptide repeat domain 21B

Also known as: ATD4, CFAP60, FAP60, FLA17, IFT139, IFT139B, JBTS11, NPHP12

This gene encodes a member of TTC21 family, containing several tetratricopeptide repeat (TPR) domains. This protein is localized to the cilium axoneme, and may play a role in retrograde intraflagellar transport in cilia. Mutations in this gene are associated with various ciliopathies, nephronophthisis 12, and asphyxiating thoracic dystrophy 4. [provided by RefSeq, Oct 2011]

GeneReviewsOMIMResearchGenerating clinical summary…

Primary Disease Associations & Inheritance

Nephronophthisis 12MIM #613820
ADAR
Short-rib thoracic dysplasia 4 with or without polydactylyMIM #613819
AR
UniProtJoubert syndrome 11

Clinical highlights

Gene-disease validity (ClinGen)
nephronophthisis 12 · ARDefinitivesufficient evidence for diagnostic panels
0
Active trials
9
Pubs (1 yr)
P/LP submissions
P/LP missense
0.85
LOEUF
DN
Mechanism· predicted
📖
GeneReview available — TTC21B
Authoritative clinical overview · Recommended first read
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Population Genetics & Constraint

gnomAD v4 — loss-of-function & missense intolerance

Tolerant — LoF & missense variants common in population
LoF Constraint?
0.85LOEUF
pLI 0.000
Z-score 2.64
OE 0.68 (0.540.85)
Tolerant

Typical tolerance to LoF variation

Missense Constraint?
-0.41Z-score
OE missense 1.04 (0.981.11)
724 obs / 693.7 exp
Tolerant

Tolerant to missense variation

Observed / Expected Ratios?
LoF OE?0.68 (0.540.85)
00.351.4
Missense OE?1.04 (0.981.11)
00.61.4
Synonymous OE?1.08
01.21.6
LoF obs/exp: 53 / 78.2Missense obs/exp: 724 / 693.7Syn Z: -0.92

ClinVar Variant Classifications

0 submitted variants in ClinVar

Protein Context — Lollipop Plot

TTC21B · protein map & ClinVar variants

Showing all ClinVar variants across the protein. Search a specific variant to highlight its position.

Clinical Trials

Active and recruiting trials from ClinicalTrials.gov

No active trials found for this gene.

Search ClinicalTrials.gov →