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Candidate gene analysis in human neural tube defects
Abee L Boyles1, Preston Hammock, Marcy C Speer
1Duke University Program in Genetics and Genomics, USA.
Summary
Identifying genes for human neural tube defects (NTDs) is challenging. Few candidate genes show significant associations in human populations, necessitating larger sample sizes and novel approaches for better discovery.
Area of Science:
- Genetics
- Developmental Biology
- Human Health
Background:
- Numerous candidate genes for human neural tube defects (NTDs) have been proposed from biochemical, developmental, and positional evidence.
- Despite extensive research, few candidate genes have shown significant associations in human populations via case-control or family-based studies.
Purpose of the Study:
- To review the landscape of candidate gene studies for human NTDs.
- To identify limitations in current approaches and suggest future directions for gene discovery.
Main Methods:
- Survey of 80 studies examining 38 candidate genes implicated in NTDs.
- Review of evidence from mouse models, developmental pathways (e.g., Wnt, Hox), and positional candidates.
- Analysis of association study results in human populations.
Main Results:
- The MTHFR 677C > T polymorphism is the only significant finding in the folate pathway, specific to an Irish population.
- Most mouse model candidates and positional candidates have not yielded confirmed associations in humans.
- Preliminary genomic screens are limited by small sample sizes.
Conclusions:
- Current methods for identifying NTD candidate genes are insufficient, with limited success in human populations.
- Future research requires increased sample sizes, refined phenotypic definitions, and integration of diverse data types.
- Exploring novel candidate gene sources, model organisms, and combining new approaches with traditional methods are crucial for advancing NTD research.