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Congenital diaphragmatic hernia candidate genes derived from embryonic transcriptomes

Meaghan K Russell1, Mauro Longoni, Julie Wells

  • 1Pediatric Surgical Research Laboratories, Massachusetts General Hospital, Boston, MA 02114, USA.

Proceedings of the National Academy of Sciences of the United States of America
|February 9, 2012
PubMed

Insights

Congenital diaphragmatic hernia (CDH) is a birth defect impacting diaphragm formation. This study used gene expression profiling to identify 27 candidate genes, including Pbx1, offering new insights into CDH development.

Area of Science:

  • Developmental biology
  • Genetics
  • Bioinformatics

Background:

  • Congenital diaphragmatic hernia (CDH) is a common congenital malformation with high morbidity and mortality.
  • Genetic heterogeneity complicates the identification of CDH-associated genes using traditional methods.

Purpose of the Study:

  • To identify genes associated with congenital diaphragmatic hernia (CDH) by analyzing gene expression profiles of developing embryonic mouse diaphragms.
  • To develop a strategy for disease gene identification by studying normal development.

Main Methods:

  • Generated whole-transcriptome expression profiles from laser-captured embryonic mouse diaphragms at key developmental stages (E11.5, E12.5, E16.5).
  • Utilized bioinformatic algorithms to identify gene sets related to biological pathways and temporal expression trends.
  • Compared identified gene sets with a curated list of known diaphragm defect genes.
  • Examined diaphragmatic defects in knockout mice for candidate gene Pbx1.

Main Results:

  • Identified 27 candidate genes for CDH through an integrative filtering strategy.
  • Confirmed the role of Pbx1 by observing previously undetected diaphragmatic defects in Pbx1 knockout mice.
  • Demonstrated the effectiveness of analyzing normal development for disease gene discovery.

Conclusions:

  • Gene expression profiling of embryonic diaphragms is a valuable tool for identifying CDH-associated genes.
  • The study successfully identified candidate genes and validated Pbx1's role in diaphragm development.
  • This approach can be extended to identify genes for other developmental anomalies.

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