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Disease at a Glance

Summary
Carbamoyl phosphate synthetase I deficiency (CPS1 deficiency) is a genetic disorder that causes episodes of toxic levels of ammonia in the blood (hyperammonemia). Symptoms include poor feeding, vomiting, lack of energy, low body temperature and weak muscle tone. These usually occur in the first few days of life. High levels of ammonia can lead to complications such as seizures, breathing problems, intellectual disability and coma. CPS1 deficiency is caused by alterations in the CPS1 gene and is inherited in an autosomal recessive pattern. Diagnosis is based on symptoms, laboratory testing, and genetic testing.
Summary
Carbamoyl phosphate synthetase I deficiency (CPS1 deficiency) is a genetic disorder that causes episodes of toxic levels of ammonia in the blood (hyperammonemia). Symptoms include poor feeding, vomiting, lack of energy, low body temperature and weak muscle tone. These usually occur in the first few days of life. High levels of ammonia can lead to complications such as seizures, breathing problems, intellectual disability and coma. CPS1 deficiency is caused by alterations in the CPS1 gene and is inherited in an autosomal recessive pattern. Diagnosis is based on symptoms, laboratory testing, and genetic testing.Carbamoyl phosphate synthetase I deficiency (CPS1 deficiency) is a genetic disorder that causes episodes of toxic levels of ammonia in the blood (hyperammonemia). Symptoms include poor feeding, vomiting, lack of energy, low body temperature and weak muscle tone. These usually occur in the first few days of life. High levels of ammonia can lead to complications such as seizures, breathing problems, intellectual disability and coma. CPS1 deficiency is caused by alterations in the CPS1 gene and is inherited in an autosomal recessive pattern. Diagnosis is based on symptoms, laboratory testing, and genetic testing.
Resource(s) for Medical Professionals and Scientists on This Disease:

About Carbamoyl-phosphate synthetase 1 deficiency

Many rare diseases have limited information. Currently GARD aims to provide the following information for this disease:

  • Population Estimate:Fewer than 5,000 people in the U.S. have thisdisease.
  • Symptoms:May start to appear at any time in life.
  • Cause:This disease is caused by a change in the genetic material (DNA).
  • Organizations:Patient organizations are available to help find a specialist, or advocacy and support for this specific disease.
  • Newborn Screening:This disease may be detected through routine newbornscreening.
  • Categories:Inherited Metabolic DiseasesGenetic Diseases
When Do Symptoms of Carbamoyl-phosphate synthetase 1 deficiency Begin?
Symptoms of this disease may start to appear at any time in life.

The age symptoms may begin to appear differs between diseases. Symptoms may begin in a single age range, or during several age ranges. The symptoms from some diseases may begin at any age. Knowing when symptoms began to appear can help medical providers find the correct diagnosis.
Prenatal Selected
Before Birth
Newborn Selected
Birth-4 weeks
Infant Selected
1-23 months
Child Selected
2-11 years
Adolescent Selected
12-18 years
Adult Selected
19-65 years
Older Adult Selected
65+ years
Symptoms may start to appear at any time in life.

Symptoms

The types of symptoms experienced, and their intensity, may vary among people with this disease. Your experience may be different from others, and you should consult your primary care provider (PCP) for more information.

This list does not include all possible symptoms related to this disease, but they may include:
Musculoskeletal System Musculoskeletal System

3 Symptoms

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Body Systems

Symptoms related to this disease may affect different systems of the body. Use the 'Filter and Sort' function to learn more about which body system(s) are affected by this disease and their associated symptom(s).

Causes

What Causes This Disease?

Genetic Changes

Can This Disease Be Passed Down From Parent to Child?

Yes. It is possible for a biological parent to pass down pathogenic variants that cause or increase the chances of getting this disease to their child. This is known as inheritance. Knowing whether other family members have previously had this disease, also known as family health history, can be very important information for your medical team. This tool from the Surgeon General can help you collect your family health history.

There are multiple ways, or patterns, a disease can be inherited depending on the gene(s) involved. Based on GARD's current pathogenic variant data, this disease can be inherited in the following pattern(s):

Autosomal Recessive

Advocacy and Support Groups

How Can Patient Organizations Help?

Patient organizations can help patients and families connect. They build public awareness of the disease and are a driving force behind research to improve patients' lives. They may offer online and in-person resources to help people live well with their disease. Many collaborate with medical experts and researchers.

Services of patient organizations differ, but may include:

  • Ways to connect to others and share personal stories
  • Easy-to-read information
  • Up-to-date treatment and research information
  • Patient registries
  • Lists of specialists or specialty centers
  • Financial aid and travel resources

Please note: GARD provides organizations for informational purposes only and not as an endorsement of their services. Please contact an organization directly if you have questions about the information or resources it provides.

Patient Organizations

6 Organizations

Organization Name

Who They Serve

Helpful Links

Country

People With

Carbamoyl-Phosphate Synthetase 1 Deficiency

Helpful Links
Country

United Kingdom

People With

Carbamoyl-Phosphate Synthetase 1 Deficiency

Helpful Links
Country

United States

People With

Rare Diseases

Helpful Links
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United States

People With

Rare Diseases

Helpful Links
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United States

People With

Rare Diseases

Helpful Links
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United States

People With

Rare Diseases

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United States

Participating in Clinical Studies

Clinical studies are part of clinical research and at the heart of all medical advances, including rare diseases. Participating in research helps researchers ultimately uncover better ways to treat, prevent, diagnose, and understand human diseases.

What Are Clinical Studies?

  1. Clinical trials determine if a new test or treatment for a disease is effective and safe by comparing groups receiving different tests/treatments.
  2. Observational studies involve recording changes over time among a specific group of people in their natural settings.
Learn more about clinical trials from this U.S. Food & Drug Administration webpage.

Why Participate in Clinical Studies?

Join the All of Us Research Program!

What if There Are No Available Clinical Studies?

What Are Clinical Studies?

Clinical studies are medical research involving people as participants. There are two main types of clinical studies:
  1. Clinical trials determine if a new test or treatment for a disease is effective and safe by comparing groups receiving different tests/treatments.
  2. Observational studies involve recording changes over time among a specific group of people in their natural settings.
Learn more about clinical trials from this U.S. Food & Drug Administration webpage.
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Why Participate in Clinical Studies?

People participate in clinical trials for many reasons. People with a disease may participate to receive the newest possible treatment and additional care from clinical study staff as well as to help others living with the same or similar disease. Healthy volunteers may participate to help others and to contribute to moving science forward.

To find the right clinical study we recommend you consult your doctors, other trusted medical professionals, and patient organizations. Additionally, you can use ClinicalTrials.gov to search for clinical studies by disease, terms, or location.
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Join the All of Us Research Program!

What if There Are No Available Clinical Studies?

ClinicalTrials.gov, an affiliate of NIH, provides current information on clinical research studies in the United States and abroad. Talk to a trusted doctor before choosing to participate in any clinical study. We recommend checking this site often and searching for studies with related terms/synonyms to improve results.
Please contact GARD if you need help finding additional information or resources on rare diseases, including clinical studies. Note, GARD cannot enroll individuals in clinical studies.
Available toll-free Monday through Friday from 12 pm to 6 pm Eastern Time
(Except: Federal Holidays)
Use the contact form to send your questions to a GARD Information Specialist.

Please allow 2 to 10 business days for us to respond.
ClinicalTrials.gov, an affiliate of NIH, provides current information on clinical research studies in the United States and abroad. Talk to a trusted doctor before choosing to participate in any clinical study. We recommend checking this site often and searching for studies with related terms/synonyms to improve results.
Please contact GARD if you need help finding additional information or resources on rare diseases, including clinical studies. Note, GARD cannot enroll individuals in clinical studies.
Available toll-free Monday through Friday from 12 pm to 6 pm Eastern Time
(Except: Federal Holidays)
Use the contact form to send your questions to a GARD Information Specialist.

Please allow 2 to 10 business days for us to respond.
Getting a Diagnosis

Take steps toward getting a diagnosis by working with your doctor, finding the right specialists, and coordinating medical care.

Last Updated: November 2023