Entire DAX1 gene deletion in an Indian boy with adrenal hypoplasia congenita.

OBJECTIVE: To report a case of Adrenal hypoplasia congenita (AHC) in an Indian boy presenting with adrenal failure in the neonatal period. Molecular diagnosis demonstrated absence of the entire DAX1 gene sequence region.
METHODS: Real-time SYBR Green Polymerase Chain Reaction (PCR) amplification followed by melt curve analysis was the molecular analytical method used. Analysis of the PCR products by Agarose gel electrophoresis was also performed.
RESULTS: Real-time SYBR Green PCR amplification carried out on a 240 bp region of Exon 1 and 320 bp region of Exon 2 of DAX1 gene did not result in any amplification for two independent DNA extractions of the patient sample. The melt curve analysis also failed to show the characteristic melt peaks. Additional analysis of the PCR products performed by Agarose gel electrophoresis of the patient samples did not reveal any DNA bands.
CONCLUSIONS: Inability to amplify two distinct regions located on two distinct exons of the DAX1 gene of the patient sample point to the possible absence of the entire DAX1 gene sequence region in the index patient. Such molecular diagnostic techniques may prove very useful in making a diagnosis as well as for genetic counseling.