# Embryologic and Developmental Origins of Gastroschisis: A Scoping Review of Historical and Contemporary Theories

## TL;DR

This paper reviews theories about the embryonic origins of gastroschisis and proposes a multifactorial developmental framework to explain its causes and variability.

## Contribution

The paper systematically categorizes 14 theories into four mechanistic groups and proposes an integrated framework for understanding gastroschisis.

## Key findings

- Gastroschisis theories are grouped into four categories: mesodermal defects, vascular disruption, umbilical ring defects, and multifactorial models.
- Right-sided predominance and phenotypic variability are explained by mesodermal vulnerability and vascular instability at the umbilical junction.
- Gastroschisis is best viewed as a spectrum of developmental disturbances rather than a single defect.

## Abstract

What are the main findings?
Fourteen embryologic theories of gastroschisis can be systematically organized into 4 mechanistic categories: mesodermal and ventral body wall folding abnormalities, vascular disruption, umbilical ring and extraembryonic attachment defects, and integrated multifactorial developmental models.Historical theories describe complementary components of overlapping developmental pathways rather than mutually exclusive mechanisms, reflecting the absence of a single unifying embryologic explanation.Embryologic, placental, and experimental evidence converges in a multifactorial process involving mesodermal vulnerability, localized vascular instability, and structural susceptibility at the umbilical abdominal wall junction, providing a biologic explanation for the consistent right-sided predominance and phenotypic variability of gastroschisis.

Fourteen embryologic theories of gastroschisis can be systematically organized into 4 mechanistic categories: mesodermal and ventral body wall folding abnormalities, vascular disruption, umbilical ring and extraembryonic attachment defects, and integrated multifactorial developmental models.

Historical theories describe complementary components of overlapping developmental pathways rather than mutually exclusive mechanisms, reflecting the absence of a single unifying embryologic explanation.

Embryologic, placental, and experimental evidence converges in a multifactorial process involving mesodermal vulnerability, localized vascular instability, and structural susceptibility at the umbilical abdominal wall junction, providing a biologic explanation for the consistent right-sided predominance and phenotypic variability of gastroschisis.

What are the implications of the main findings?
Gastroschisis is best understood as a spectrum of periumbilical developmental disturbances rather than a single isolated abdominal wall defect.An integrated embryologic framework supports more precise prenatal interpretation, risk stratification, counseling, and classification of simple, complex, and closing forms of gastroschisis.Future research should focus on molecular, vascular, and biomechanical interactions at the umbilical ring to refine mechanistic understanding and inform preventive and therapeutic strategies.

Gastroschisis is best understood as a spectrum of periumbilical developmental disturbances rather than a single isolated abdominal wall defect.

An integrated embryologic framework supports more precise prenatal interpretation, risk stratification, counseling, and classification of simple, complex, and closing forms of gastroschisis.

Future research should focus on molecular, vascular, and biomechanical interactions at the umbilical ring to refine mechanistic understanding and inform preventive and therapeutic strategies.

Background/Objectives: Gastroschisis remains one of the most debated congenital abdominal wall defects with respect to its embryologic and developmental origins. Despite decades of investigation, no consensus exists regarding a single causative mechanism, and competing hypotheses variably explain laterality, bowel injury, and closing variants. This scoping review aims to synthesize historical and contemporary embryologic theories of gastroschisis and integrate them into a coherent developmental framework with direct relevance to prenatal assessment and clinical interpretation. Methods: A structured literature search was conducted in PubMed, Web of Science, and Scopus from inception through December 2025. Studies proposing original embryologic mechanisms or providing primary experimental, placental, or developmental evidence were included. Eligible publications were qualitatively synthesized and classified according to evidence strength as historical descriptive, experimental, placental pathology, or integrative synthesis. Embryologic theories were organized into mechanistic categories based on affected structures, developmental timing, and proposed pathophysiology. Results: Twenty-six publications met inclusion criteria, yielding fourteen distinct embryologic theories. These were categorized into four mechanistic categories: mesodermal and ventral body wall folding abnormalities, vascular disruption models, umbilical ring and extraembryonic attachment defects, and integrated multifactorial developmental concepts. No single mechanistic category alone consistently accounted for right-sided predominance, variability in bowel injury, and the occurrence of closing variants. Conclusions: Gastroschisis is best understood as a spectrum of periumbilical developmental disturbances arising from interacting mesodermal, vascular, and biomechanical factors. An integrated embryologic framework improves interpretation of dynamic prenatal imaging findings, supports refined risk stratification and counseling, and provides a biologic foundation for future translational research.