Understanding the Spectrum: Symptoms and Daily Life

Understanding what life looks like with 1p36 deletion syndrome means looking at a broad spectrum of possibilities. No two children with this condition are exactly alike. While there are common “hallmarks,” your child’s path will be unique to them. The goal of understanding these symptoms is not to set limits, but to provide the right support at the right time ^[1][2].

The Developmental Path

The most consistent feature of 1p36 deletion syndrome is developmental delay. This means children usually take longer to reach milestones like sitting up, crawling, or speaking ^[3][4].

• Motor Skills & Hypotonia: Most children have hypotonia, or “floppy” muscle tone ^[3]. This can make it harder for them to support their own head or use their hands for fine tasks. Physical therapy (PT) and occupational therapy (OT) are essential tools to help strengthen these muscles over time ^[5].
• Cognitive Variability: While many children experience moderate-to-severe intellectual disability, the range is wide ^[3]. Some individuals have only mild impairment, and in rare cases, children have reached near-normal intellectual development ^[1].
• Communication: Many children may speak only a few words or use non-verbal methods like signs or assistive devices to communicate ^[6].

Neurological Hallmarks: Seizures and Brain Structure

The brain is the “command center” where the missing genetic material has the most impact.

• Epilepsy and Infantile Spasms: More than half of children with 1p36 deletion will experience seizures ^[4]. A specific type called infantile spasms can occur in infancy and requires immediate medical attention to protect cognitive function ^[4][7]. While these spasms are sometimes described as sudden “jackknife” jerks, they frequently present as highly subtle movements—such as slight head drops, eye deviations, or brief stiffening ^[4]. If you notice any unusual, repetitive movements, take a video to show your doctor immediately.
• Brain Differences: Doctors may use an MRI to look for neuronal migration defects ^[8]. This simply means that during early development, some brain cells didn’t move to their “assigned seats,” which can contribute to seizures and learning challenges ^[8][9].

Physical and Behavioral Traits

You may notice specific physical features that are common in this “community of faces”:

• Facial Features: These often include deep-set eyes, straight eyebrows, and a small, pointed chin ^[3].
• Growth: Many children have short stature and may grow more slowly than their peers ^[10][3].
• Feeding Challenges: Because of low muscle tone or issues with swallowing (dysphagia), feeding can be a significant part of daily life ^[11][12]. Some children may eventually need a feeding tube to ensure they get enough nutrition to grow ^[3].
• Behavior: As children grow, they may exhibit behavioral challenges like temper tantrums or self-biting ^[5]. Because children with 1p36 often face severe communication delays, they can become deeply frustrated when they cannot express their needs, leading to these intense behaviors ^[5]. Behavioral therapy and learning alternative communication methods can help manage these frustrations.

The Power of Early Intervention

While the list of symptoms can feel daunting, the most important thing to know is that your child’s brain is incredibly adaptable. Early intervention—starting therapies as early as possible—is the standard of care ^[5][6]. By surrounding your child with PT, OT, and speech therapy, you are providing the best environment for them to navigate their unique challenges.

Return to Home | Next: Medical Monitoring