BCL6

Chr 3

BCL6 transcription repressor

Also known as: BCL5, BCL6A, LAZ3, ZBTB27, ZNF51

The protein encoded by this gene is a zinc finger transcription factor and contains an N-terminal POZ domain. This protein acts as a sequence-specific repressor of transcription, and has been shown to modulate the transcription of STAT-dependent IL-4 responses of B cells. This protein can interact with a variety of POZ-containing proteins that function as transcription corepressors. This gene is found to be frequently translocated and hypermutated in diffuse large-cell lymphoma (DLCL), and may be involved in the pathogenesis of DLCL. Alternatively spliced transcript variants encoding different protein isoforms have been found for this gene. [provided by RefSeq, Aug 2015]

GeneReviewsOMIMResearchGenerating clinical summary…

Clinical highlights

Interpreting a novel variant
This gene is strongly intolerant of loss-of-function variation in the population, so LoF variants warrant close attention. No curated mechanism annotation is available — see the mechanism card for the computational prediction and its caveats.Based on population constraint only.
8
Active trials
438
Pubs (1 yr)
—
P/LP submissions
—
P/LP missense
0.33
LOEUF· LoF intol.
LOF
Mechanism· predicted
📖
GeneReview available — BCL6
Authoritative clinical overview · Recommended first read
Open GeneReview ↗

Population Genetics & Constraint

gnomAD v4 — loss-of-function & missense intolerance

LoF intolerant — likely haploinsufficient
LoF Constraint?
0.33LOEUF
pLI 0.960
Z-score 4.17
OE 0.14 (0.07–0.33)
Highly constrained

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

Missense Constraint?
2.25Z-score
OE missense 0.70 (0.64–0.77)
312 obs / 445.3 exp
Mild constraint

Moderately missense-constrained (top ~2.5%)

Observed / Expected Ratios?
LoF OE?0.14 (0.07–0.33)
0≤0.351.4
Missense OE?0.70 (0.64–0.77)
0≤0.61.4
Synonymous OE?1.02
0≤1.21.6
LoF obs/exp: 4 / 27.7Missense obs/exp: 312 / 445.3Syn Z: -0.22

ClinVar Variant Classifications

0 submitted variants in ClinVar

Protein Context — Lollipop Plot

BCL6 · 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

Large B Cell LymphomaLBCLDiffuse Large B Cell Lymphoma (DLBCL)

Prizloncabtagene Autoleucel (Prizlon-cel) for the Treatment of Relapsed or Refractory Large B-cell Lymphoma Post FDA Approved CAR T-cell Therapy

NOT YET RECRUITING
NCT07875413Phase PHASE2AbelZeta Inc.Started 2027-05
Prizloncabtagene Autoleucel
Diffuse Large B-Cell Lymphoma Associated With Chronic InflammationEBV-Positive Diffuse Large B-Cell Lymphoma, Not Otherwise SpecifiedHigh Grade B-Cell Lymphoma, Not Otherwise Specified

Zanubrutinib and CAR T-cell Therapy for the Treatment of Recurrent or Refractory Aggressive B-cell Non-Hodgkin's Lymphoma or Transformed Indolent B-cell Lymphoma

ACTIVE NOT RECRUITING
NCT05202782Phase PHASE2Northwestern UniversityStarted 2022-03-21
Chimeric Antigen Receptor T-Cell TherapyQuality-of-Life AssessmentQuestionnaire Administration
Accelerated Phase Chronic Myelogenous Leukemia, BCR-ABL1 PositiveAcute Biphenotypic LeukemiaAcute Lymphoblastic Leukemia

Personalized NK Cell Therapy in CBT

RECRUITING
NCT02727803Phase PHASE2M.D. Anderson Cancer CenterStarted 2016-05-19
Allogeneic Natural Killer Cell Line NK-92Anti-Thymocyte GlobulinBusulfan
Recurrent Diffuse Large B-Cell LymphomaRecurrent High Grade B-Cell Lymphoma With MYC and BCL2 or BCL6 RearrangementsRecurrent Transformed Follicular Lymphoma to Diffuse Large B-Cell Lymphoma

Fecal Microbiome Transplant to Remodel Intestinal Microbiota for Patients With Relapsed or Refractory Lymphoma With Exposure to High-Risk Antibiotics Who Are Receiving Chimeric Antigen Receptor T Cells

RECRUITING
NCT07042438Phase PHASE2City of Hope Medical CenterStarted 2026-02-11
Axicabtagene CiloleucelBiospecimen CollectionChemotherapy
Burkitt LymphomaDouble-Expressor LymphomaHigh Grade B-Cell Lymphoma With MYC and BCL2 and/or BCL6 Rearrangements

Testing the Safety of Anti-Cancer Drug, CX-5461 (Pidnarulex), in Treating Lymphoma With Specific Changes in the MYC Gene

RECRUITING
NCT07069699Phase PHASE1, PHASE2National Cancer Institute (NCI)Started 2027-01-11
Biopsy ProcedureBiospecimen CollectionComputed Tomography
Diffuse Large B Cell LymphomaHigh-grade B-cell LymphomaHigh Grade B-Cell Lymphoma With MYC and BCL2 or BCL6 Rearrangements

Exploring the Clinical Impact of MYC Aberrations and Their Relationship With Microenvironment in Diffuse Large B Cell Lymphoma and High-Grade B Cell Lymphoma

RECRUITING
NCT06588205Fondazione Italiana Linfomi - ETSStarted 2025-05-05
High-grade B-cell LymphomaBurkitt LymphomaLymphoma, B-Cell

Sepantronium Bromide for the Treatment of High-grade B-cell Lymphoma

ACTIVE NOT RECRUITING
NCT05263583Phase PHASE2Cothera Bioscience, IncStarted 2022-12-09
Sepantronium Bromide
Diffuse Large B-Cell LymphomaDiffuse Large B-Cell Lymphoma, Not Otherwise SpecifiedDouble-Expressor Lymphoma

Testing the Addition of a New Anti-cancer Drug, Venetoclax, to Usual Chemotherapy for High Grade B-cell Lymphomas

ACTIVE NOT RECRUITING
NCT03984448Phase PHASE2, PHASE3National Cancer Institute (NCI)Started 2019-10-22
Biospecimen CollectionBone Marrow BiopsyComputed Tomography