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Phocomelia is a congenital condition that involves malformations of human arms and legs which result in a flipper-like appendage. [1] [2] A prominent cause of phocomelia is the mother being prescribed the use of the drug thalidomide during pregnancy; however, the causes of most cases are to be determined. [2]
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Dysmelia (from the Greek dys (δυσ-), "bad" + mélos (μέλος), "limb" + English suffix -ia) is a congenital disorder of a limb resulting from a disturbance in embryonic development. [ 1 ] Types
Roberts syndrome, or sometimes called pseudothalidomide syndrome, is an extremely rare autosomal recessive genetic disorder that is characterized by mild to severe prenatal retardation or disruption of cell division, leading to malformation of the bones in the skull, face, arms, and legs.
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Genetic causes of birth defects include inheritance of abnormal genes from the mother or the father, as well as new mutations in one of the germ cells that gave rise to the fetus. Male germ cells mutate at a much faster rate than female germ cells, and as the father ages, the DNA of the germ cells mutates quickly.
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This syndrome is caused by mutations in the establishment of cohesion 1 homolog 2 gene. [3]This gene is located on the short arm of chromosome 8 (8p21.1). Mutations in this gene also cause Roberts/SC phocomelia syndrome.