Overview
Anomaly of chromosome 1 is an obsolete term that was previously used to describe a group of rare genetic conditions caused by structural or numerical changes in chromosome 1. Chromosome 1 is the largest human chromosome and contains a large number of genes important for normal growth and development. Changes to this chromosome can include deletions (missing pieces), duplications (extra copies of pieces), translocations (rearrangements), or other structural abnormalities. Because chromosome 1 is so large and gene-rich, the specific symptoms and severity can vary widely depending on exactly which part of the chromosome is affected and how much genetic material is involved. This term has been marked as obsolete in medical classification systems because it was too broad. Today, doctors prefer to use more specific diagnoses that describe the exact region of chromosome 1 that is affected, such as 1p36 deletion syndrome, 1q21.1 microdeletion syndrome, or other precisely defined chromosomal conditions. Patients who were previously given this general diagnosis may benefit from updated genetic testing to receive a more specific and informative diagnosis. Symptoms associated with chromosome 1 abnormalities can range from mild to severe and may include intellectual disability, developmental delays, distinctive facial features, growth problems, heart defects, and other organ abnormalities. Treatment is generally supportive and tailored to each person's specific symptoms, as there is no single cure for chromosomal abnormalities. Early intervention services, therapies, and regular medical follow-up can help improve quality of life.
Key symptoms:
Intellectual disabilityDevelopmental delaysUnusual facial featuresShort stature or growth problemsHeart defectsLow muscle toneSeizuresFeeding difficulties in infancySpeech and language delaysLearning difficultiesBehavioral challengesVision problemsHearing lossKidney abnormalities
Variable
Can be inherited in different ways depending on the underlying gene
Variable
Can begin at different ages, from infancy through adulthood
Treatments
No FDA-approved treatments are currently listed for OBSOLETE: Anomaly of chromosome 1.
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Specialists
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Treatment Centers
8 centersBaylor College of Medicine Rare Disease Center ↗
Baylor College of Medicine
📍 Houston, TX
🏥 NORDStanford Medicine Rare Disease Center ↗
Stanford Medicine
📍 Stanford, CA
🔬 UDNNIH Clinical Center Undiagnosed Diseases Program ↗
National Institutes of Health
📍 Bethesda, MD
🔬 UDNUCLA UDN Clinical Site ↗
UCLA Health
📍 Los Angeles, CA
🔬 UDNBaylor College of Medicine UDN Clinical Site ↗
Baylor College of Medicine
📍 Houston, TX
🔬 UDNHarvard/MGH UDN Clinical Site ↗
Massachusetts General Hospital
📍 Boston, MA
🏥 NORDMayo Clinic Center for Individualized Medicine ↗
Mayo Clinic
📍 Rochester, MN
👤 Mayo Clinic Center for Individualized Medicine
🏥 NORDUCLA Rare Disease Day Program ↗
UCLA Health
📍 Los Angeles, CA
Travel Grants
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Caregiver Resources
NORD Caregiver Resources
Support, advocacy, and financial assistance for caregivers of rare disease patients.
Mental Health Support
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Family & Caregiver Grants
Financial assistance programs specifically for caregivers of rare disease patients.
Social Security Disability
Learn how rare disease patients may qualify for SSDI/SSI benefits.
Questions for your doctor
Bring these to your next appointment
- Q1.Can we get updated genetic testing to identify the exact region of chromosome 1 that is affected?,What specific symptoms should we watch for based on our child's chromosomal change?,What early intervention services should we start right away?,Are there any heart, kidney, or brain abnormalities we need to screen for?,What is the expected developmental outlook for our child's specific condition?,Should other family members be tested for chromosomal changes?,Are there any clinical trials or research studies we should know about?
Common questions about OBSOLETE: Anomaly of chromosome 1
What is OBSOLETE: Anomaly of chromosome 1?
Anomaly of chromosome 1 is an obsolete term that was previously used to describe a group of rare genetic conditions caused by structural or numerical changes in chromosome 1. Chromosome 1 is the largest human chromosome and contains a large number of genes important for normal growth and development. Changes to this chromosome can include deletions (missing pieces), duplications (extra copies of pieces), translocations (rearrangements), or other structural abnormalities. Because chromosome 1 is so large and gene-rich, the specific symptoms and severity can vary widely depending on exactly whic