Editorial: Early embryonic development lineage

At the genetic level, in the article from Kolvenbach et al., we witness the pinpointing specific causes of disease, as demonstrated by the identification of ABL1 haploinsufficiency as a monogenic cause of omphalocele by exome sequencing in a four-generation multiplex family. This discovery underscores how single-gene perturbations can derail entire morphogenetic and physiological function of the whole body. Similarly, the role of PPARGC1A in bovine embryo development highlights how master regulators of core cellular events, like mitochondrial biogenesis, are essential for the starting of very early life.Then, zooming out to the tissue and organ scale, advanced research approaches are providing unprecedented resolution in elucidating related cellular networks. The construction of the first tissue blockresolved transcriptomic atlas of the human fetal brainstem is a landmark resource by Liu et al. This study moves beyond bulk analysis to map the spatiotemporal expression of genes, directly linking developmental dynamics to vulnerability for neuropsychiatric disorders. Meanwhile, this kind high-resolution approach is revolutionizing our understanding of complex birth defects, as reviewed for congenital heart disease (CHD) by Lv et al. The integration of single-cell and spatial multi-omics is dissecting CHD into a disorder of specific cardiac progenitor lineages and their molecular networks.As the knowledge of developmental biology accumulates, practical approaches and potential therapies have been improved. Chen et al. present their work on enhancing pig SCNT embryo development via a sophisticated oviductal co-culture system shows how mimicking the native microenvironment-through metabolic support and activation of pathways like PI3K-AKT-can rescue developmental competence. In the avian model, the identification of a cocktail of cecal growth factors (GWEN) that promotes enteric neurosphere formation and colonization provides a blueprint for harnessing endogenous signaling to repair the enteric nervous system. Meanwhile, the discovery that the intrinsic metabolic pattern and their role in cell fate spatial organization of human pluripotent stem cells, is visualized by JC-1 as a spatial tracker. The spatially dictated cell fate reminds researchers that fundamental cell states like metabolism are inseparable from the instructions for tissue patterning.Collectively, these studies draw a coherent image: the path from a fertilized egg to a healthy individual is governed by an intricate hierarchy of genetic codes, molecular networks, metabolic dynamics, and cellular interactions. Dysfunctions or disruptions at any level can lead to birth defects or diseases. The future lies in continuing to integrate these scales-connecting genetic variants to specific cell composition in developing tissues, and using that knowledge to create physiological models and specific interventions. This collection is a testimonial to the power of this integrated approach, charting a course toward a deeper understanding of life's beginnings and new avenues for therapeutic methods.