Synlogic’s first Synthetic Biotic™ medicines are designed to treat patients with phenylketonuria (PKU) and hyperammonemia. We are rapidly advancing new Synthetic Biotic medicines to treat a range of diseases, including cancer, metabolic diseases and autoimmune and inflammatory conditions.

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Preclinical Studies IND-Enabling Studies Phase 1 Phase 2

Hyperammonemia – Urea Cycle Disorders




Additional Rare Metabolic Diseases


Hyperammonemia – Hepatic Encephalopathy


Inflammatory Bowel Disease

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Immuno-Oncology Solid Tumors


Additional Oncology Applications

Inborn Errors of Metabolism Metabolic Disease Immunomodulation

“We set out to identify diseases where we could have a meaningful impact and also demonstrate the power and potential of synthetic biology, leading us to focus on hyperammonemia, PKU and cancer as our initial indications. Once we understood the underlying molecular biology behind these conditions, we could rapidly design Synthetic Biotic™ medicines that could potentially provide new treatment options for patients.”

— Paul Miller, PhD, Chief Scientific Officer


Hyperammonemia is a metabolic condition characterized by excess ammonia in the blood. Caused by liver damage or genetic conditions such as urea cycle disorders, hyperammonemia impacts the body’s ability to convert ammonia to urea, a natural waste product produced when the body processes protein. Ammonia accumulation in the blood can be can be toxic, causing brain injury and death. Synlogic has designed SYNB1020 to consume ammonia and convert it into a beneficial amino acid called arginine, with the goal of preventing toxic ammonia build-up in these patients. We are currently conducting clinical trials in people with elevated blood ammonia levels due to cirrhosis to demonstrate safety and test whether this could be a useful therapeutic to help patients manage their blood ammonia levels.

Phenylketonuria (PKU)

Phenylketonuria (PKU) is a rare genetic disorder estimated to affect 16,500 people in the U.S., according to the National PKU Association. People with PKU are unable to process phenylalanine (Phe), an essential amino acid that enters the body as a component of dietary protein. PKU requires adherence to a strict diet to prevent the toxic accumulation of Phe in the blood and brain, which can impact neurological function. Synlogic has designed a Synthetic Biotic medicine, SYNB1618, to produce phenylalanine-degrading enzymes designed to lower Phe levels to allow those with PKU to consume more natural protein. We are currently conducting clinical trials of SYNB1618 in people with PKU to demonstrate safety and to test whether this could be a useful therapeutic option to help patients manage their blood Phe levels.

Immuno Oncology

Cancer cells are known for their ability to evade the body’s immune system, allowing them to persist, proliferate and metastasize. Synlogic is designing Synthetic Biotic medicines that work to combat the tumor’s ability to evade the immune system, boosting a patient’s immune response and promoting the body’s ability to detect and destroy cancer cells. These programs are now in pre-clinical studies. Synlogic is advancing its first clinical candidate in cancer, SYNB1891, into Investigational New Drug application (IND)-enabling studies. SYNB1891 is designed to activate the STING pathway specifically in antigen presenting cells that naturally sense and engulf bacteria. This results in local ablation of cancer cells as well targeting metastases that spread throughout the body.

Autoimmune & Inflammatory Disease

Synlogic is partnering with pharmaceutical company AbbVie to develop novel Synthetic Biotic medicines to treat inflammatory bowel disease.