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What is BeckFahrner Syndrome. BeckFahrner syndrome BEFAHRS is a rare genetic disorder caused by a gene variantmutation of the TET3 Tet Methylcytosine Dioxygenase 3 gene. In the case of BeckFahrner syndrome this mutation in the TET3 gene causes the TET3 protein to malfunction or to not to be produced sufficiently ultimately disrupting normal development and causing health problems. BeckFahrner syndrome is characterized by is characterized by global developmental delay andor intellectually disability with mild to severe intellectual impairment.