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Classification of left-right patterning defects in zebrafish, mice, and humans
1Huntsman Cancer Institute, Center for Children, Department of Oncological Sciences, University of Utah, Salt Lake City, Utah 84112, USA.
American Journal of Medical Genetics
|July 27, 2001
Summary
This review categorizes vertebrate left-right patterning defects by analyzing gene expression, midline, and situs phenotypes. It provides a framework for understanding the genetic basis of laterality defects in humans and other vertebrates.
Area of Science:
- Developmental Biology
- Genetics
- Human Embryology
Background:
- Vertebrate left-right axis establishment involves numerous genes and developmental processes.
- While specific mechanisms vary across vertebrate classes, conserved asymmetric gene expression (nodal, lefty, pitx2) in the left lateral plate mesoderm is crucial.
- Left-right development of major organs (brain, heart, gut) is intrinsically linked to embryonic midline development.
Purpose of the Study:
- To categorize left-right patterning defects in vertebrates.
- To establish a framework for assessing the genetic underpinnings of laterality defects.
- To highlight conserved mechanisms and their relation to human and vertebrate development.
Main Methods:
- Review of existing literature on left-right axis formation.
- Categorization of defects based on observed gene expression patterns.
- Analysis of midline phenotypes and situs abnormalities.
Main Results:
- Identification of conserved asymmetric gene expression patterns (nodal, lefty, pitx2).
- Correlation between midline development and organ laterality.
- Classification of laterality defects based on specific phenotypic and genetic criteria.
Conclusions:
- A structured framework for analyzing laterality defects is proposed.
- Understanding conserved genetic mechanisms aids in diagnosing human and vertebrate congenital anomalies.
- Further research into the genetic basis of left-right patterning is warranted.
