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Array Comparative Genomic Hybridization Array CGH for Detection of Genomic Copy Number Variants
Published on: February 21, 2015
Copy number variation analysis implicates novel pathways in patients with oculo-auriculo-vertebral-spectrum and
Valentina Guida1, Francesca Piceci Sparascio1,2, Laura Bernardini1
1Medical Genetics Division, Fondazione IRCCS Casa Sollievo della Sofferenza, San Giovanni Rotondo, Italy.
Copy number variants (CNVs) are implicated in Oculo-auriculo-vertebral spectrum (OAVS), a craniofacial developmental disorder. This study found CNVs in 10.5% of OAVS patients, highlighting their role in the condition's genetic heterogeneity.
Area of Science:
- Genetics
- Developmental Biology
- Craniofacial Development
Background:
- Oculo-auriculo-vertebral spectrum (OAVS) is a complex craniofacial developmental disorder with unclear etiology.
- Genetic and environmental factors are suspected contributors to OAVS.
- Congenital heart defects are frequently observed in OAVS patients.
Purpose of the Study:
- To investigate the role of copy number variants (CNVs) in the etiology of OAVS.
- To assess the frequency of pathogenic CNVs in a cohort of OAVS individuals with congenital heart defects.
Main Methods:
- Chromosomal microarray analysis was performed on 19 unrelated OAVS individuals.
- Analysis focused on identifying pathogenic CNVs and variants of uncertain significance.
- Specific genes and pathways, including the PAX-SIX-EYA-DACH network, were examined.
Main Results:
- Pathogenic CNVs were identified in 2/19 (10.5%) individuals.
- CNVs of uncertain significance were found in 7/19 (36.9%) individuals.
- Intragenic CNVs involving DACH1/DACH2 and duplications encompassing DMBX1/OTX3 were noted, implicating key developmental pathways.
Conclusions:
- CNVs contribute to the genetic heterogeneity of OAVS.
- The PAX-SIX-EYA-DACH network is implicated as a novel pathway in OAVS etiology.
- Gene dosage alterations via CNVs are likely significant in OAVS development.
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