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Genetic and Rare Diseases Information Center (GARD)

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Syndactyly type 3

Other Names for this Disease
  • Ring and little finger syndactyly
  • SDTY3
  • Syndactyly of fingers four and five
  • Syndactyly of the ring and little finger
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Syndactyly type 3 (SD3) is a limb abnormality present at birth that is characterized by complete fusion of the 4th and 5th fingers on both hands. In most cases only the soft tissue is fused, but in some cases the bones of the fingers (distal phalanges) are fused. There is evidence that SD3 is caused by mutations in the GJA1 gene, which has also been implicated in a condition called oculodentodigital dysplasia. SD3 is the characteristic digital abnormality in this condition. SD3 is inherited in an autosomal dominant manner.[1]
Last updated: 6/3/2013


  1. Syndactyly type 3. Orphanet. October 2010; Accessed 6/3/2013.
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In Depth Information

  • The Online Mendelian Inheritance in Man (OMIM) is an catalog of human genes and genetic disorders. Each entry has a summary of related medical articles. It is meant for health care professionals and researchers. OMIM is maintained by Johns Hopkins University School of Medicine. 
  • PubMed is a searchable database of medical literature and lists journal articles that discuss Syndactyly type 3. Click on the link to view a sample search on this topic.