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16p11.2 deletion syndrome.

Wendy K Chung1, Timothy Pl Roberts2, Elliott H Sherr3

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|March 5, 2021
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Summary
This summary is machine-generated.

The 16p11.2 BP4-BP5 deletion, a common cause of neurodevelopmental disorders, impairs speech and language in 70% of carriers. This copy number variant (CNV) also impacts cognition, motor skills, and increases risks for autism and obesity.

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Area of Science:

  • Genetics
  • Neuroscience
  • Developmental Biology

Background:

  • The 16p11.2 BP4-BP5 region harbors a recurrent copy number variant (CNV) deletion.
  • This deletion is a frequent cause of neurodevelopmental disorders and autism spectrum disorder, affecting approximately 1 in 2000 individuals.

Purpose of the Study:

  • To investigate the neurodevelopmental, neurobehavioral, and physical health consequences of the 16p11.2 BP4-BP5 deletion.
  • To understand the genetic impact on brain development, structure, and function in individuals with this CNV.

Main Methods:

  • Analysis of neurodevelopmental outcomes, including speech, language, and cognitive abilities (IQ).
  • Assessment of associated neurobehavioral conditions such as motor coordination difficulties and autism.
  • Evaluation of physical health parameters including seizures and obesity prevalence.
  • Examination of brain imaging data (brain volumes, white matter properties) and electrophysiological responses.

Main Results:

  • Deletion carriers exhibit significant delays in speech, phonology, and language (70%), with a notable decrease in IQ compared to controls.
  • High prevalence of motor coordination difficulties (60%), autism spectrum disorder (20-25%), and unprovoked seizures (24%).
  • Increased risk of obesity (75% by adulthood) and congenital anomalies.
  • Associated with increased brain volumes, altered white matter microstructure, and early auditory cortex electrophysiological changes.

Conclusions:

  • The 16p11.2 BP4-BP5 deletion is a significant genetic factor contributing to a spectrum of neurodevelopmental and neurobehavioral disorders.
  • This CNV provides a valuable model for studying the genetic underpinnings of complex brain development and function.
  • Understanding the homogeneous genetic cause allows for targeted research into autism and other neurodevelopmental phenotypes.