Overview
Distal deletion 1q syndrome, also known as 1q43q44 deletion syndrome or monosomy 1q43-q44, is a rare chromosomal condition caused by missing genetic material at the very end (distal tip) of chromosome 1. This missing piece of DNA means that several important genes are absent, which can affect how the brain, body, and organs develop before and after birth. People with this condition typically experience intellectual disability ranging from mild to severe, delayed development of speech and motor skills, and a small head size (microcephaly). Many individuals also have seizures, which can begin in infancy or early childhood. Distinctive facial features are common, including widely spaced eyes, a flat nasal bridge, and low-set ears. Some people have heart defects, feeding difficulties in infancy, or problems with muscle tone. There is currently no cure for distal deletion 1q syndrome. Treatment focuses on managing symptoms and supporting development. This includes anti-seizure medications, speech therapy, physical therapy, occupational therapy, and special education programs. With the right support, many individuals can make meaningful developmental progress. Early intervention is especially important and can significantly improve quality of life.
Also known as:
Key symptoms:
Intellectual disability (mild to severe)Delayed speech and language developmentDelayed motor skills such as sitting and walkingSmall head size (microcephaly)Seizures or epilepsyLow muscle tone (hypotonia)Distinctive facial features such as widely spaced eyes and flat nasal bridgeFeeding difficulties in infancyBehavioral challenges including features of autism spectrum disorderCongenital heart defects (in some individuals)Absent or reduced corpus callosum (a brain structure)Short statureConstipation or other bowel problems
Clinical phenotype terms (15)— hover any for plain English
Sporadic
Usually appears on its own, not inherited from a parent
Neonatal
Begins at or shortly after birth (first 4 weeks)
Treatments
No FDA-approved treatments are currently listed for Distal deletion 1q syndrome.
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Specialists
View all specialists →No specialists are currently listed for Distal deletion 1q syndrome.
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
No travel grants are currently matched to Distal deletion 1q syndrome.
Community
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Caregiver Resources
NORD Caregiver Resources
Support, advocacy, and financial assistance for caregivers of rare disease patients.
Mental Health Support
Rare disease caregiving can be isolating. Connect with counseling and peer support.
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.What is the exact size and location of my child's deletion, and which genes are missing?,What therapies should we start right away, and how often should they happen?,What type of seizures does my child have, and what is the best medication to treat them?,Does my child need a heart evaluation or brain MRI?,Should other family members be tested for this chromosomal change?,What educational supports and early intervention programs should we apply for?,Are there any research studies or patient registries we can join to help advance understanding of this condition?
Common questions about Distal deletion 1q syndrome
What is Distal deletion 1q syndrome?
Distal deletion 1q syndrome, also known as 1q43q44 deletion syndrome or monosomy 1q43-q44, is a rare chromosomal condition caused by missing genetic material at the very end (distal tip) of chromosome 1. This missing piece of DNA means that several important genes are absent, which can affect how the brain, body, and organs develop before and after birth. People with this condition typically experience intellectual disability ranging from mild to severe, delayed development of speech and motor skills, and a small head size (microcephaly). Many individuals also have seizures, which can begin i
How is Distal deletion 1q syndrome inherited?
Distal deletion 1q syndrome follows a sporadic inheritance pattern. Genetic counseling can help families understand recurrence risk and testing options.
At what age does Distal deletion 1q syndrome typically begin?
Typical onset of Distal deletion 1q syndrome is neonatal. Age of onset can vary across affected individuals.