A. Takagi et al., A novel sex-determining region on Y (SRY) nonsense mutation identified in a 45,X/47,XYY female, FERT STERIL, 72(1), 1999, pp. 167-169
Objective: To determine whether an SRY mutation participated in the phenoty
pic outcome in the case of a 45,X/47,XYY female.
Design: Analysis of genomic DNA for mutations in SRY.
Setting: An academic teaching hospital.
Patient(s): A family that included one phenotypic female with 45,X/47,XYY m
osaicism.
Intervention(s): Extraction of DNA, polymerase chain reaction analysis, nuc
leotide sequencing, and restriction enzyme analysis.
Main Outcome Measure(s): Comparison of control and subject DNA sequences.
Result(s): The patient demonstrated one nucleotide (thymine, T) deletion at
position 422, leading to a frame-shift mutation. This mutation changes the
codon for Tyr (TAT) to a stop codon (TAG) within the open reading frame ju
st upstream of a conserved DNA-binding motif. Neither other mutations nor n
ucleotide mosaicisms were found in the remaining regions of the gene. This
mutation was not present in the patient's normal father.
Conclusion(s): The mutant SRY may be assumed to induce a nonfunctional SRY-
coded protein that lacks a DNA-binding motif. These results explain the phe
notypic female and the gonadal dysgenesis in the 45,X/47,XYY sex-reversed o
ffspring. (Fertil Steril(R) 1999;72:167-9. (C) 1999 by American Society for
Reproductive Medicine.)