Name: RO7126209
Synonyms: RG6102, Brain shuttle gantenerumab
Therapy Type: Immunotherapy (passive) (timeline)
Target Type: Amyloid-Related (timeline)
Condition(s): Alzheimer's Disease
U.S. FDA Status: Alzheimer's Disease (Phase 1)
Company: Hoffmann-La Roche


RO7126209 is a new version of the anti-amyloid monoclonal antibody gantenerumab, engineered to more easily cross the blood-brain barrier using Roche’s “brain shuttle” technology. A Fab fragment that binds the human transferrin receptor is attached to the effector (Fc) domain of the gantenerumab monoclonal antibody. RO7126209 circulating in the bloodstream binds the transferrin receptor on the endothelial cells that make up the blood-brain barrier. This leads to its endocytosis and release into the brain parenchyma.

Preclinical work has been published using the mouse version of gantenerumab fused to a single mouse transferrin receptor-binding Fab fragment. In AD mouse models, 50 times more antibody entered the brain and bound to amyloid plaques, compared with unmodified gantenerumab. RO7126209 stimulated plaque clearance by immune cells at doses far lower than did the parent antibody, without initiating immune responses to endothelial cells or other transferrin receptor-bearing bystander cells (Jan 2014 news; Jan 2018 news).

In other preclinical studies, brain shuttle delivery of either BACE1 peptide inhibitors or the protease neprilysin were able to reduce brain amyloid in AD mice (Campos et al., 2020; Ruderisch et al., 2017).

Denali Therapeutics is working on a similar transferrin receptor-mediated brain delivery system (May 2020 news). Roche’s is the first to enter Phase 1 testing in humans.


In August 2019, Roche began a Phase 1 study of the safety, tolerability, immunogenicity and pharmacokinetics of RO712620 in 34 healthy men in North Carolina. Volunteers in five sequential cohorts received a single dose of antibody or placebo by intravenous infusion. An adaptive design escalated doses based on results of prior cohorts. Primary outcomes are adverse events, laboratory findings and vital signs up to two months after dosing. Investigators are also measuring CSF antibody concentrations three or five days after dosing, and anti-RO7126209 antibodies up to two months after. Completion is anticipated in July 2020.

For details on RO7126209 trials, see

Last Updated: 19 Jun 2020


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Therapeutics Citations

  1. Gantenerumab

News Citations

  1. Brain Shuttle Ferries Antibodies Across the Blood-Brain Barrier
  2. Antibody Shuttle Rouses Anti-Aβ Response in Brain without Waking the Periphery
  3. Molecular Transport Vehicle Shuttles Therapies into Brain

Paper Citations

  1. . Brain Shuttle Neprilysin reduces central Amyloid-β levels. PLoS One. 2020;15(3):e0229850. Epub 2020 Mar 10 PubMed.
  2. . Potent and Selective BACE-1 Peptide Inhibitors Lower Brain Aβ Levels Mediated by Brain Shuttle Transport. EBioMedicine. 2017 Oct;24:76-92. Epub 2017 Sep 7 PubMed.

External Citations


Further Reading


  1. . A human blood-brain barrier transcytosis assay reveals antibody transcytosis influenced by pH-dependent receptor binding. PLoS One. 2014;9(4):e96340. Epub 2014 Apr 30 PubMed.