Study of Treatment and Metabolism in Patients With Urea Cycle Disorders

The recruitment status of this study is unknown because the information has not been verified recently.
Verified December 2003 by National Center for Research Resources (NCRR).
Recruitment status was  Recruiting
Baylor College of Medicine
Information provided by:
National Center for Research Resources (NCRR) Identifier:
First received: October 18, 1999
Last updated: June 23, 2005
Last verified: December 2003

RATIONALE: The urea cycle is the process in which nitrogen is removed from the blood and converted into urea, a waste product found in urine . Urea cycle disorders are inherited disorders caused by the lack of an enzyme that removes ammonia from the bloodstream. Gene therapy is treatment given to change a gene so that it functions normally. Studying the treatment and metabolism of patients with urea cycle disorders may be helpful in developing new treatments for these disorders.

PURPOSE: Two-part clinical trial to study the treatment and metabolism of patients who have urea cycle disorders.

Condition Intervention Phase
Amino Acid Metabolism, Inborn Errors
Behavioral: Protein and calorie controlled diet
Genetic: Ornithine transcarbamylase vector
Phase 1

Study Type: Interventional
Study Design: Primary Purpose: Treatment
Official Title: Therapeutic and Metabolic Studies of Urea Cycle Disorders: Part A: Nitrogen Flux and Ureagenesis; Part B (Closed): Phase I Adenovirus Vector-Mediated Gene Therapy for Ornithine Transcarbamylase Deficiency

Resource links provided by NLM:

Further study details as provided by National Center for Research Resources (NCRR):

Estimated Enrollment: 66
Study Start Date: December 1999
Detailed Description:

PROTOCOL OUTLINE: This protocol involves 2 clinical studies. Part A is a metabolic study of glutamine conversion to urea at different levels of protein intake, while on and off medications. Part B is a dose escalation study of a first-generation adenoviral vector with an E1 deletion and an E3 deletion substitution (d1309) expressing ornithine transcarbamylase (OTC).

In Part A, diet is controlled for protein and calories. Intravenous glutamine and urea are administered. Controls are given intravenous arginine, phenylacetate, and benzoate.

In Part B, groups of 3 patients are given a single low, intermediate, or high dose of intravenous OTC vector. Allopurinol is administered every 12 hours for 12 days. As of 12/10/1999, Part B of the study is closed.


Ages Eligible for Study:   6 Months to 64 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   Yes


Part A. Patients at least 6 months old with ornithine transcarbamylase deficiency (OTC), i.e.: Hemizygous OTC or homozygous autosomal recessive disorder with evidence of complete enzyme deficiency Hemizygous OTC male with late presentation and presumed evidence for residual enzyme activity OTC heterozygotes (molecular diagnosis) with severely symptomatic to asymptomatic disease Obligate heterozygotes for autosomal recessive disorder (parent or genotyped sibling) Normal adult volunteers and genotyped siblings entered as controls Part B. Metabolically stable heterozygous OTC females aged 18 to under 65 Orotic acid level at least 5 times normal on allopurinol Symptoms ranging from severe to asymptomatic acceptable No prior hospitalization for hyperammonemia Exclusion criteria (Parts A and B): Acute or chronic intercurrent illness Pregnancy Acute hyperammonemia

  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00004307

United States, Texas
Baylor College of Medicine Recruiting
Houston, Texas, United States, 77030
Contact: Susan Carter    832-822-1630   
Sponsors and Collaborators
National Center for Research Resources (NCRR)
Baylor College of Medicine
Study Chair: Brendan Lee Baylor College of Medicine
  More Information Identifier: NCT00004307     History of Changes
Other Study ID Numbers: NCRR-M01RR00188-0606  BCM-H4379 
Study First Received: October 18, 1999
Last Updated: June 23, 2005
Health Authority: United States: Federal Government

Keywords provided by National Center for Research Resources (NCRR):
inborn errors of metabolism
rare disease
urea cycle disorder

Additional relevant MeSH terms:
Brain Diseases, Metabolic, Inborn
Amino Acid Metabolism, Inborn Errors
Metabolism, Inborn Errors
Ornithine Carbamoyltransferase Deficiency Disease
Urea Cycle Disorders, Inborn
Brain Diseases
Brain Diseases, Metabolic
Central Nervous System Diseases
Genetic Diseases, Inborn
Genetic Diseases, X-Linked
Metabolic Diseases
Nervous System Diseases processed this record on May 26, 2016