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Selected midline defect associations: a population study
M J Khoury1, J F Cordero, J Mulinare
1Birth Defects and Genetic Diseases Branch, Centers for Disease Control, US Department of Health and Human Services, Atlanta, Georgia 30333.
Insights
This study analyzed midline defects in infants, finding that while many occur alone, specific combinations are statistically associated. Understanding these patterns is crucial for exploring developmental causes of birth defects.
Area of Science:
- Developmental Biology
- Pediatric Genetics
- Public Health
Background:
- Midline defects are a group of congenital anomalies affecting various body structures.
- Understanding the co-occurrence of these defects is vital for identifying underlying genetic and environmental factors.
Purpose of the Study:
- To investigate the association between seven common midline defects using population-based data.
- To identify specific patterns and combinations of co-occurring midline defects, excluding known syndromes.
Main Methods:
- Utilized data from the Metropolitan Atlanta Congenital Defects Program.
- Analyzed 1743 infants with at least one midline defect, focusing on neural tube defects, oral clefts, omphalocele, esophageal atresia/tracheoesophageal fistula, imperforate anus, conotruncal heart defects, and diaphragmatic hernia.
- Performed pairwise analysis to determine statistical associations between defect types.
Main Results:
- 4.9% of infants with one midline defect had at least a second, and 0.5% had two additional midline defects.
- Specific combinations were observed, such as neural tube defects with cleft lip and imperforate anus with spina bifida.
- Certain combinations were notably absent, including neural tube defects with conotruncal heart defects.
Conclusions:
- While most midline defects occur in isolation, specific associations exist, suggesting shared or related pathogenetic mechanisms.
- Further research is needed to refine understanding of these associations in relation to embryology and pathogenesis.
- Findings highlight the complexity of congenital anomalies and the importance of detailed pattern analysis.
Abstract:
Using data from the population-based Metropolitan Atlanta Congenital Defects Program, the association of seven relatively common and easily ascertainable groups of midline defects was studied. These defects were neural tube defects (575 patients), oral clefts (633 patients), omphalocele (141 patients), esophageal atresia/tracheoesophageal fistula (88 patients), imperforate anus (151 patients), conotruncal heart defects (289 patients), and diaphragmatic hernia (75 patients). Known syndromes were excluded from the analysis. Of 1743 infants with at least one midline defect, 86 (4.9%) had at least a second midline defect, and 9 (0.5%) had two additional midline defects. Pairwise analysis of the seven defects shows that, although most midline defects tend to be statistically associated with other midline defects, specific combinations of midline defects are seen. For example, neural tube defects are more strongly associated with cleft lip with or without cleft palate than with cleft palate alone; imperforate anus is more strongly associated with spina bifida than with anencephaly or encephalocele. Moreover, some combinations of defects are not observed (eg, neural tube defect and conotruncal heart defect, clefts and diaphragmatic hernia, omphalocele and esophageal atresia/tracheoesophageal fistula). These data point to the need for further refinement in the study of the association of midline defects in terms of embryologic and pathogenetic mechanisms because most midline defects tend to occur as an isolated defect, some midline defects occur with nonmidline defects (such as limb defects), and specific associations among midline defects are observed.