Deciphering caudal embryonic defects: embryological analysis and reviewing literature data

Area of Science:

• Embryology
• Developmental Biology
• Medical Genetics

Background:

• Multiple syndromes and associations affect the caudal region, presenting diverse morphological features.
• Challenges in delineating these conditions and the emergence of new defects necessitate a thorough investigation.
• Understanding the morphologic presentations and pathogenesis of caudal embryonic defects is crucial.

Purpose of the Study:

• To describe a case of OEIS complex (omphalocele, exstrophy of bladder, imperforate anus, spinal defects).
• To compare morphologic presentations of caudal region syndromes using literature.
• To analyze the embryogenesis of these defects.

Main Methods:

• Case report of OEIS complex.
• Comprehensive literature search for caudal region syndromes.
• Comparative analysis of morphologic presentations.
• Embryological analysis of phenotypic presentations.

Main Results:

• Significant overlap in symptom complexes across various caudal defects was observed.
• Embryological analysis indicates a common pathogenesis originating early in embryonic development.
• Defects likely arise from issues in proliferation, migration, or differentiation of intra-embryonic mesoderm subdivisions.

Conclusions:

• A novel hypothesis for caudal defect causation is proposed.
• The hypothesis posits that local internal environmental imbalances during gastrulation can lead to nutritional insults.
• These insults, occurring in the third and early fourth embryonic weeks, may underlie caudal defects.