GATA3 mutations cause HDR (
hypoparathyroidism, sensorineural
deafness, and
renal dysplasia) syndrome and, consistent with the presence of the second DiGeorge syndrome locus (
DGS2) proximal to
GATA3, distal 10p deletions often leads to HDR and DiGeorge syndromes. Here, we report on six Japanese patients with
GATA3 abnormalities. Cases 1-5 had a normal karyotype, and case 6 had a 46,XX,del(10)(p15) karyotype. Cases 1-6 had two or three of the HDR triad features. Case 6 had no DiGeorge syndrome phenotype except for hypoparathyroidism common to HDR and DiGeorge syndromes. Mutation analysis showed heterozygous
GATA3 mutations in cases 1-5, i.e., c.404-405insC (p.P135fsX303) in case 1, c.700T>C & c.708-709insC (p.F234L & p.S237fsX303) on the same allele in case 2, c.737-738insG (p.G246fsX303) in case 3, c.824G>T (p.W275L) in case 4, and IVS5+1G>C (splice error) in case 5. Deletion analysis of chromosome 10p revealed loss of
GATA3 and preservation of
D10S547 in case 6. The results are consistent with the previous finding that
GATA3 mutations are usually identified in patients with two or three of the HDR triad features, and provide supportive data for the mapping of
DGS2 in the region proximal to
D10S547.
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