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N2B27 media formulations influence gastruloid development.

Tina Balayo¹, Sharna Lunn², Pau Pascual-Mas¹

¹Department of Medicine and Life Sciences, Universitat Pompeu Fabra, Barcelona 08003, Spain.

Development (Cambridge, England)

|November 25, 2025

Summary

This summary is machine-generated.

Mouse gastruloid development differs based on basal medium composition. Home-made N2B27 medium promotes earlier elongation and a larger anterior domain compared to commercial NDiff227, impacting cell fate specification.

Keywords:

Cell fate Gastruloids Mouse embryonic stem cells N2B27 NDiff®227 Signalling and gastrulation

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Area of Science:

Stem cell biology
Developmental biology
Embryo modeling

Background:

Gastruloids are 3D stem cell aggregates mimicking early embryonic development.
Mouse gastruloids are typically cultured in N2B27 basal medium.
Formulations of N2B27 vary, including home-made (HM-N2B27) and commercial (NDiff227) versions.

Purpose of the Study:

To investigate the impact of different N2B27 basal media formulations on mouse gastruloid development.
To compare the effects of home-made (HM-N2B27) versus commercially sourced (NDiff227) media on gastruloid morphology, cell numbers, and gene expression.

Main Methods:

Culture of mouse gastruloids in HM-N2B27 and NDiff227 media.
Morphological analysis of gastruloid elongation and anterior domain size.
RNA sequencing (RNAseq) to analyze gene expression patterns and cell fate specification.
Differential gene enrichment analysis to identify underlying signaling pathway changes.

Main Results:

Both HM-N2B27 and NDiff227 media support gastruloid elongation.
HM-N2B27 induced earlier elongation, increased cell numbers, and a larger anterior domain compared to NDiff227.
RNAseq revealed differential cell fate specification: HM-N2B27 favored spinal cord-related genes, while NDiff227 promoted mesodermal differentiation.
Key signaling pathway alterations were identified between the two media conditions.

Conclusions:

Basal media composition significantly influences mouse gastruloid development and cell fate specification.
HM-N2B27 supports more robust early development and anterior patterning than NDiff227.
Careful selection of basal media is crucial for reproducible stem cell-based embryo model engineering.