Two novel mutations identified in two Chinese gelatinous drop-like corneal dystrophy families

PURPOSE: To identify the genetic defect in the TACSTD2 gene that causes gelatinous drop-like corneal dystrophy (GDLD) in two unrelated consanguineous Chinese families. METHODS: Genomic DNA was prepared from leukocytes of peripheral venous blood. The coding region of the TACSTD2 gene was evaluated by means of polymerase chain reaction and direct sequencing. RESULTS: Sequencing of the TACSTD2 gene of the two probands revealed two novel homozygous frameshift mutations: c.84insG and c.480delC. The identified molecular defect cosegregates with the disease among affected members of the families and is not found in 50 unaffected controls. CONCLUSIONS: This study reports two novel mutations in two GDLD families and expands the spectrum of mutations in TACSTD2 gene that may cause pathological corneal amyloidosis.