New definition of a human embryo proposed amid rapid scientific advances
        
            By Megan Molteni, 
                STAT
             | 08. 17. 2023
        
                    
                                    
                    
                                                                                                                                    
                                                                            
                              
    
  
  
    
  
          
  
      
    
            When someone says the word embryo, what do you think of? Probably that picture you’ve seen a thousand times on a thousand different news articles: a translucent orb swelling with cytoplasm being prodded by a microinjection needle under the light of a microscope. The mainstreaming of IVF, or in vitro fertilization, has familiarized new generations of people with what the earliest stages of human development entails.
But earlier this summer, when scientists revealed they’re now able to create blobs of stem cells in the lab that self-organize into the same sorts of structures embryos themselves build during those first few weeks, it blasted wide open whatever ideas of the embryo we used to have. Were these structures embryo models, as some scientists named them, or something approaching actual embryos? How would anyone know when that line had been crossed?
“The definition of the human embryo is far from being engrained, it’s constantly evolving with scientific advances,” said Nicolas Rivron, a developmental biologist at the Institute of Molecular Biotechnology of the Austrian Academy of Sciences in Vienna. In a perspective published...
 
       
 
  
 
    
    
  
   
                        
                                                                                
                 
                                                    
                            
                                  
    
  
  
      Related Articles
    
  
          
  
  
  
  
  
  
      
            
                  
  
      
    
    
    
    
            Paula Amato & Shoukhrat Mitalipov
[OHSU News/Christine Torres Hicks]
On September 30th, a team of 21 scientists from Oregon Health & Science University (OHSU) published a significant paper in Nature Communications, with a scientifically accurate but, to many, somewhat abstruse headline:
Induction of experimental cell division to generate cells with reduced chromosome ploidy
The lead authors were Shoukhrat Mitalipov, recently described here as “a push-the-envelope biologist,” and his long-term colleague Paula Amato. (Recall that in July the pair had co-published with...
 
       
 
 
  
      
    
    
                
                        
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
                                                           By Pam Belluck,  The New York Times | 10.17.2025
                                                        
     
    
    
            Before dawn on a March morning, Doug Whitney walked into a medical center 2,000 miles from home, about to transform from a mild-mannered, bespectacled retiree into a superhuman research subject.
First, a doctor inserted a needle into his back to...
 
       
 
 
  
      
    
    
                
                        
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
                                                           By Elizabeth Dwoskin and Zoeann Murphy,  The Washington Post | 10.01.2025
                                                        
     
    
    
            MEXICO CITY — When she walked into an IVF clinic in June, Alin Quintana knew it would be the last time she would try to conceive a child. She had prepared herself spiritually and mentally for the visit: She had traveled to a nearby...
 
       
 
 
  
      
    
    
                
                        
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
                                                           By Rob Stein,  NPR | 09.30.2025
                                                        
     
    
    
            Scientists have created human eggs containing genes from adult skin cells, a step that someday could help women who are infertile or gay couples have babies with their own genes but would also raise difficult ethical, social and legal issues...