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Multisite neural tube closure in humans

M I Van Allen¹

¹Department of Medical Genetics, B.C. Children's Hospital, Vancouver, Canada.

Birth Defects Original Article Series

|January 1, 1996

Summary

This study provides evidence for multisite neural tube (NT) closure in humans, challenging the single-site model and suggesting a new classification for neural tube defects (NTDs). This approach aids in understanding NTD causes and risks.

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Area of Science:

Developmental Biology
Human Genetics
Teratology

Background:

The traditional single-site closure model for neural tube (NT) development has limitations in explaining the heterogeneity of neural tube defects (NTDs).
Previous classifications have grouped diverse NTDs, obscuring etiological factors and site-specific environmental influences.
NTDs are often considered multifactorial, involving complex gene-environment interactions.

Purpose of the Study:

To present evidence supporting a multisite NT closure model in humans.
To propose a new classification system for NTDs based on closure sites.
To explore the implications of this model for understanding NTD etiology, recurrence risks, and susceptibility to environmental factors.

Main Methods:

Analysis of human NTDs with examples supporting multisite closure.
Comparison with experimental findings in mouse models.
Review of epidemiological studies, monogenic disorders, and teratogenic exposures.

Main Results:

The majority of human NTDs can be classified using a multisite closure model.
Evidence from human studies and animal models supports distinct closure sites for the neural tube.
Monogenic etiologies are suggested for specific NTDs, influencing susceptibility to factors like folic acid deficiency.

Conclusions:

A multisite closure model offers a more accurate framework for classifying NTDs, improving the understanding of their causes.
Accurate description of NT anomalies by closure site is crucial for future research and clinical applications.
This model has implications for refining recurrence risk assessment and identifying specific environmental susceptibilities for NTDs.

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