EBP, ARSL, PEX7, GNPAT, AND AGPS GENE ANALYSIS IN CHONDRODYSPLASIA PUNCTATA
Chondrodysplasia punctata can be inherited as an X-linked dominant, X-linked recessive or autosomal recessive disorder. Germline variants in the EBP gene are associated with the X-linked dominant form which shows male lethality. The X-linked recessive form (CDPX1) is characterised by distal phalangeal hypoplasia and is associated with variants in the ARSL gene (previously known as ARSE). Autosomal recessive forms of rhizomelic chondrodysplasia punctata (RCDP) are clinically indistinguishable from each other and are characterised by rhizomelic shortening of the upper extremities, typical dysmorphic facial appearance, congenital contractures and severe growth and mental retardation. Autosomal recessive forms of RCDP are characterised by variants in the PEX7 gene (RCDP type 1) GNPAT gene (RCDP type 2) or AGPS gene (RCDP type 3).
Please note: for NHS patients in England this test has been superseded with gene panel testing (R104 Skeletal dysplasia, please contact your local Genomic Laboratory Hub for further information). Single gene testing is only available if required urgently for clinical management.
The laboratory participates in the European Molecular Genetics Quality Network (EMQN) sequencing scheme.