TAR syndrome is an autosomal recessive disorder caused by biallelic variants in the RBM8A gene, one pathogenic variant on one allele and a rare variant on the other allele. The hallmarks are radius aplasia and thrombocytopenia.
Thrombocytopenia is characterized by a low platelet count and reduced magakaryoctes in the bone marrow. This results in an increased bleeding risk.
Typical of the disease is the absence of the radius bone and a preserved thumb, which is important for differentials. In severe cases the ulna bone and even the lower limbs may be involved.
The diagnosis can be already suspected by antenatal ultrasound, but confirmed by molecular genetic testing.
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None (1984) Radial aplasia and amegakaryocytic thrombocytopenia (TAR syndrome) among Nigerian children. ![]() |
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None (1987) Thrombocytopenia and absent radius (TAR) syndrome. ![]() |
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None (1981) Dactylaplasia in mice a two-locus model for development anomalies. ![]() |
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Albers CA et al. (2012) Compound inheritance of a low-frequency regulatory SNP and a rare null mutation in exon-junction complex subunit RBM8A causes TAR syndrome. ![]() |
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35. |
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