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Array Comparative Genomic Hybridization (Array CGH) for Detection of Genomic Copy Number Variants
Published on: February 21, 2015
A recurrent 16p12.1 microdeletion supports a two-hit model for severe developmental delay.
Santhosh Girirajan1, Jill A Rosenfeld, Gregory M Cooper
1Department of Genome Sciences, University of Washington School of Medicine, Seattle, Washington, USA.
Nature Genetics
|February 16, 2010
Summary
A specific microdeletion at 16p12.1 is linked to childhood developmental delay. This genetic finding suggests a two-hit model where additional genetic variations can worsen neurodevelopmental outcomes.
Area of Science:
- Genetics
- Developmental Biology
- Neuroscience
Background:
- Childhood developmental delay is a complex condition with diverse genetic underpinnings.
- Recurrent microdeletions are increasingly recognized as significant contributors to neurodevelopmental disorders.
Purpose of the Study:
- To identify and characterize recurrent microdeletions associated with childhood developmental delay.
- To investigate the inheritance patterns and clinical penetrance of the 16p12.1 microdeletion.
- To explore the role of additional genetic variants in modulating the phenotype of the 16p12.1 microdeletion.
Main Methods:
- Case-control study design utilizing large genetic datasets.
- Statistical analysis including odds ratios and p-values to assess association.
- Replication study in an independent cohort to confirm findings.
- Analysis of inheritance patterns and co-occurring copy-number variants.
Main Results:
- A recurrent 520-kb 16p12.1 microdeletion was significantly associated with developmental delay (OR = 7.2, P = 0.0009).
- Replication confirmed the association (OR = 2.5, P = 0.028).
- Carrier parents often exhibited neuropsychiatric phenotypes (OR = 6, P = 0.037).
- Individuals with the microdeletion were more likely to have additional large copy-number variants (OR = 6.6, P = 5.7 x 10(-5)).
Conclusions:
- The 16p12.1 microdeletion is a risk factor for developmental delay and neuropsychiatric conditions.
- A two-hit model is proposed, where the microdeletion predisposes to and exacerbates neurodevelopmental phenotypes.
- This model may be broadly applicable to other microdeletions and neuropsychiatric diseases.
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