KBTBD2

Chr 7

kelch repeat and BTB domain containing 2

Also known as: BKLHD1

NCBI Gene: 25948ENSG00000170852UniProt: Q8IY47

Enables ubiquitin-like ligase-substrate adaptor activity. Involved in protein K48-linked ubiquitination and regulation of cellular response to insulin stimulus. Is active in cytoplasm. [provided by Alliance of Genome Resources, Jul 2025]

64
ClinVar variants
22
Pathogenic / LP
1.00
pLI score· haploinsufficient
0
Active trials
Clinical Summary— KBTBD2
⚡
Population Constraint (gnomAD)
Highly constrained gene — heterozygous loss-of-function variants are very rare in the population (pLI 1.00). One damaged copy is likely sufficient to cause disease.
📋
ClinVar Variants
22 Pathogenic / Likely Pathogenic· 41 VUS of 64 total submissions

Population Genetics & Constraint

gnomAD v4 — loss-of-function & missense intolerance

gnomAD
LoF intolerant — likely haploinsufficient
LoF Constraint?LOEUF (Loss-of-function Observed/Expected Upper bound Fraction) is the upper bound of the 90% CI for LoF OE — the preferred gnomAD v4 metric. Lower = more intolerant to LoF. LOEUF < 0.35 = highly constrained.
0.23LOEUF
pLI 0.998
Z-score 4.45
OE 0.07 (0.03–0.23)
Highly constrained

Highly LoF-intolerant (top ~10% of genes)

Missense Constraint?Missense Z-score: standard deviations fewer missense variants observed vs. expected. Z > 3.09 (p < 0.001) = gene does not tolerate missense variation. OE missense < 0.6 is also considered constrained.
2.69Z-score
OE missense 0.58 (0.52–0.66)
194 obs / 331.9 exp
Mild constraint

Moderately missense-constrained (top ~2.5%)

Observed / Expected Ratios?Shaded band = 90% confidence interval. Vertical tick = point estimate. Grey threshold line = gnomAD constraint cutoff for that variant class.
LoF OE?Ratio of observed to expected LoF variants. Upper CI bound (LOEUF) ≤ 0.35 = strong LoF constraint signal.0.07 (0.03–0.23)
0≤0.351.4
Missense OE?Ratio of observed to expected missense variants. OE ≤ 0.6 = fewer missense variants than expected by chance.0.58 (0.52–0.66)
0≤0.61.4
Synonymous OE?Control metric — synonymous variants are largely neutral and expected near OE = 1.0. Significant deviation may indicate annotation issues.1.01
0≤1.21.6
LoF obs/exp: 2 / 26.9Missense obs/exp: 194 / 331.9Syn Z: -0.13

ClinVar Variant Classifications

64 submitted variants in ClinVar

ClinVar

Classification Summary

Pathogenic19
Likely Pathogenic3
VUS41
Likely Benign1
19
Pathogenic
3
Likely Pathogenic
41
VUS
1
Likely Benign

Curated Variants Distribution

Classified variants from ClinVar · 5 ACMG categories

ClassificationLoFMissense + InframeNon-codingSynonymousTotal
Pathogenic
0
0
19
0
19
Likely Pathogenic
0
0
3
0
3
VUS
0
40
1
0
41
Likely Benign
0
0
0
1
1
Benign
0
0
0
0
0
Total04023164

LoF = frameshift, stop gained/lost, canonical splice · Counts from ClinVar esearch · Updated hourly

View in ClinVar →

Protein Context — Lollipop Plot

KBTBD2 · protein map & ClinVar variants

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

OMIM — Genotype-Phenotype Relationships

1 OMIM entry

OMIM
Clinical Literature
Landmark / reviewRecent case evidence
Key Publications
Landmark & review papers · by relevance
PubMed
Top 10 resultsSearch PubMed ↗
Recent Gene-Specific Literature
Gene in title · MEDLINE · newest first
Europe PMC
Top 5 resultsSearch Europe PMC ↗

Clinical Trials

Active and recruiting trials from ClinicalTrials.gov

ClinicalTrials.gov

No active trials found for this gene.

Search ClinicalTrials.gov →

External Resources

Links to major genomics databases and tools