Ingression during early gastrulation of fundulus

Area of Science:

• Developmental Biology
• Cellular Biology
• Embryology

Background:

• Early gastrulation is crucial for embryonic development.
• Understanding cell movements during gastrulation is key to deciphering developmental processes.
• Fundulus heteroclitus serves as a model organism for studying embryonic development.

Purpose of the Study:

• To investigate the cellular mechanisms of gastrulation in Fundulus heteroclitus.
• To determine if involution occurs during early gastrulation and germ ring formation.
• To characterize the mode of cell movement during early embryonic cell ingressions.

Main Methods:

• Observation of individual cell motility during early gastrulation.
• Tracking cell behavior before and during germ ring formation in Fundulus heteroclitus.
• Analysis of cell arrangement and movement patterns during ingression.

Main Results:

• Involution does not occur; instead, cells ingress individually.
• Ingression is initiated by superficial deep cells at the blastoderm margin.
• Cells ingress supramarginally and exhibit blebbing locomotion, a non-contact inhibiting movement.

Conclusions:

• Early gastrulation in Fundulus heteroclitus involves cell ingression, not involution.
• Ingression proceeds via individual cell movement and blebbing locomotion.
• This study redefines early cellular invasive activities in embryonic development.