Recent Updates
Recently added Catalysts

DNL126

Phase 1

Mucopolysaccharidosis Type IIIA | Small molecule | Rare Disease |Denali Therapeutics Inc.|Trials Updated: Jul 13, 2026

DNL126 development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since Dec 2023

DNL126 target and mechanism

Molecular targetSGSH
ModalitySmall molecule

Success Probability

Subscribe to view

Market & Valuation

Subscribe to view

Trial Design

CONTROLLEDDMC
Total Trials1
Total Enrollment20

FDA Designations

ORPHAN_DRUGFAST_TRACK

DNL126 clinical trials

DNL126 · 1 trial · 1 indication

Phase 1 1
NCT06181136Study of DNL126 in Pediatric Participants With Mucopolysaccharidosis Type IIIA (Sanfilippo Syndrome Type A)Mucopolysaccharidosis Type IIIA
ACTIVE NOT_RECRUITING20 Analytics
PHASE1ACTIVE NOT_RECRUITING
Study of DNL126 in Pediatric Participants With Mucopolysaccharidosis Type IIIA (Sanfilippo Syndrome Type A)
Mucopolysaccharidosis Type IIIAUnlock trial analytics

Study Endpoints

Primary Endpoints

Change from baseline in the natural logarithm of cerebrospinal fluid (CSF) heparan sulfate (HS) concentration
49 weeks

Secondary Endpoints

Change from baseline in the natural logarithm of urine HS (normalized to creatinine) concentration
49 weeks
Change from baseline in liver volume multiples of normal
49 weeks
Change from baseline in the natural logarithm of serum neurofilament light chain (NfL) concentration
73 weeks
Unlock Study Endpoints

Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Cohort A1EXPERIMENTALParticipants with MPS IIIA
Cohort A2EXPERIMENTALParticipants with MPS IIIA
Cohort A3EXPERIMENTALParticipants with MPS IIIA
Cohort B1EXPERIMENTALParticipants with MPS IIIA
Cohort B2EXPERIMENTALParticipants with MPS IIIA

Interventions

NameTypeDescription
DNL126DRUGintravenous repeating dose
Unlock Study Design Details

Eligibility Criteria

Age Range0 Years to 18 Years
SexALL
Healthy VolunteersNo
Study Sites4

Key Inclusion Criteria: * Confirmed diagnosis of MPS IIIA * For Cohort A2: No more than 1 participant may have predictors of a slow-progressing phenotype * For Cohort A3: Approximately 2 participants will have predictors of the slow-progressing phenotype * For Cohort B1: Have a severe phenotype bas...

Countries:United States
Unlock Eligibility Criteria

Frequently asked questions about DNL126

What is DNL126 used for?

DNL126 is an investigational therapy being developed for Mucopolysaccharidosis Type IIIA, also known as Sanfilippo syndrome type A, a rare inherited lysosomal storage disorder. It is a small molecule designed to address the underlying enzyme deficiency associated with this condition. DNL126 has received Orphan Drug and Fast Track designations from the FDA.

What does DNL126 target?

DNL126 targets SGSH, the enzyme sulfamidase that is deficient in Mucopolysaccharidosis Type IIIA. By targeting SGSH, DNL126 aims to address the enzyme deficiency that leads to heparan sulfate accumulation in this lysosomal storage disorder. It is a small molecule therapeutic candidate.

Who is developing DNL126?

DNL126 is being developed by Denali Therapeutics Inc., which trades on the Nasdaq under the ticker symbol DNLI. Denali is a biopharmaceutical company focused on therapies for neurodegenerative and rare diseases, and DNL126 is its small molecule candidate for Mucopolysaccharidosis Type IIIA.

What phase is DNL126 in?

DNL126 is in Phase 1 clinical development. It is an investigational drug and has not been approved by the FDA. The Phase 1 program is evaluating DNL126 in pediatric participants with Mucopolysaccharidosis Type IIIA, and the FDA has granted the program Orphan Drug and Fast Track designations.

What clinical trials is DNL126 in?

DNL126 is being studied in one active clinical trial, NCT06181136, titled Study of DNL126 in Pediatric Participants With Mucopolysaccharidosis Type IIIA (Sanfilippo Syndrome Type A). The Phase 1 trial is active but not recruiting, has an enrollment of 20 participants, and is being conducted in the United States.