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Neural tube defects: are neurulation and canalization forms causally distinct?
1Division of Medical and Molecular Genetics, United Medical School, Guy's Hospital, London, England.
American Journal of Medical Genetics
|March 1, 1990
Summary
Neural tube defects (NTDs) are classified as upper (neurulation) or lower (canalization). Studies suggest these two types are causally related, not distinct, indicating a shared developmental origin.
Area of Science:
- Developmental biology
- Medical genetics
- Public health
Background:
- Neural tube defects (NTDs) are congenital abnormalities.
- NTDs are often categorized into upper (neurulation) and lower (canalization) types based on location and embryological origin.
Purpose of the Study:
- To investigate the causal relationship between upper and lower types of neural tube defects.
- To determine if these two classifications represent distinct or related etiological pathways.
Main Methods:
- Analysis of familial recurrence of NTDs within sibships to assess concordance.
- Examination of NTD cases occurring despite maternal periconceptional vitamin supplementation.
Main Results:
- Eighteen percent (7 of 38) of sibships with multiple NTD individuals showed discordance between upper and lower defect types.
- Of 10 NTD cases occurring despite vitamin supplementation, 8 were neurulation defects and 2 were canalization defects.
Conclusions:
- Findings suggest a causal relationship between upper (neurulation) and lower (canalization) neural tube defects.
- The data do not support the hypothesis that upper and lower NTDs are distinct entities, implying a common underlying mechanism.