Send us a Message

Submit Data |  Help |  Video Tutorials |  News |  Publications |  Download |  REST API |  Citing RGD |  Contact   


The Human Phenotype Ontology (HPO) is downloaded weekly from The file downloaded is considered the "last stable build" available for the ontology. For more about the HPO, view their website at

Term:Abnormal preimplantation embryonic development
go back to main search page
Accession:HP:0033335 term browser browse the term
Definition:An anomaly in the development of the embryo in a stage prior to implantation.
Comment:Human embryo development begins in relative transcriptional silence with an oocyte to embryo transition that lasts for about 3 days and encompasses fusion of the egg and sperm, migration and fusion of the germ cell pronuclei, genetic and epigenetic reprogramming. The embryo subsequently undergoes compaction to form a morula that marks the first morphological indication of a break in radial symmetry. Subsequent cell divisions lead to the development of a blastocyst that comprises a fluid-filled blastocyst cavity and an inner cell mass, surrounded by trophectoderm cells. Implantation, which in humans occurs at approximately day 7 of development, is required for further development of the embryo proper.

show annotations for term's descendants           Sort by:

Term paths to the root
Path 1
Term Annotations click to browse term
  Human phenotype 0
    Phenotypic abnormality 0
      Abnormality of prenatal development or birth 0
        Abnormal embryonic development 0
          Abnormal preimplantation embryonic development 0
            Formation of multiple pronuclei during fertilization 0
            Repeated implantation failure 0
            Zygotic cleavage failure 0
paths to the root