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Two rights make a wrong: human left-right malformations

B Casey1

  • 1Department of Pathology, Baylor College of Medicine and Texas Children's Hospital, Houston, TX 77030, USA. bcasey@bcm.tmc.edu

Human Molecular Genetics
|September 15, 1998
PubMed
Summary
This summary is machine-generated.

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Human embryos develop left-right asymmetry, but variations like heterotaxy can occur. Genetic factors, including an X-chromosome gene, influence these developmental patterns.

Area of Science:

  • Developmental Biology
  • Human Genetics
  • Embryogenesis

Background:

  • Vertebrates, including humans, develop anatomical left-right asymmetry during embryogenesis.
  • Variations from the typical arrangement (situs solitus) lead to heterotaxy, encompassing situs ambiguus (randomization) and situs inversus (complete reversal) of organ positions.
  • Familial heterotaxy exhibits diverse inheritance patterns, including autosomal dominant, recessive, and X-linked modes.

Purpose of the Study:

  • To investigate the genetic underpinnings of human heterotaxy.
  • To identify genes involved in establishing left-right axis determination during embryogenesis.

Main Methods:

  • Utilized positional cloning to identify a specific gene on the X chromosome linked to heterotaxy.
  • Reviewed recent studies on left-right axis development in model organisms (chick, frog, mouse) to identify candidate genes.

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Main Results:

  • Identified a gene on the X chromosome associated with certain cases of human heterotaxy.
  • Candidate genes from model organism studies are emerging as crucial players in the genetic cascade of asymmetry development.

Conclusions:

  • Genetic factors play a significant role in human heterotaxy and left-right asymmetry.
  • The identified X-chromosome gene and other candidate genes are integral to the genetic cascade regulating embryonic left-right axis development.