[46,XY female sex reversal patient with a novel point mutation in the coding sequence of the SRY gene].
OBJECTIVE
To investigate the molecular mechanism of a Chinese patient with 46, XY sex reversal.


METHODS
DNA fragments of the SRY gene from the typical XY female sex reversal patient and her father were amplified by polymerase chain reaction (PCR). The amplified PCR fragments were cloned into the pUCm-T vector, and direct sequencing was carried out on an ABI 377-3 automated DNA sequencer to detect the mutation. PCR-restriction enzyme digestion was applied to detect the results of DNA sequencing.


RESULTS
A novel mutation of the SRY gene was identified in the XY sex reversal patient of this study. A T is replaced by an A in codon 129 at position +387, resulting in the replacement of the polar amino acid tyrosine (TAT) by the stop code (TAA) in the HMG-box, whereas her father was proved to have the wild-type sequence. Because the mutation introduced an enzyme site of MaeIII, the PCR-restrict enzyme digestion showed that there were three bands (131 bp,231 bp and 247 bp) in the patient, whereas two bands (131 bp and 478 bp) in normal man. It verified the results of sequencing analysis. The results after searching the Human Gene Mutation Database showed that this mutation was not described before and should be a new mutation.


CONCLUSIONS
The novel mutation in SRY gene has provided valuable information for the understanding of molecular mechanism of the patient with 46,XY female sex reversal.
Zhou
Chang
C
Institute of Reproductive and Stem Cell Engineering, Xiangya Medical College, Central South University Changsha, Hunan, 410078 PR China.
Li
Lu-yun
LY
Fu
Jun-jiang
JJ
Mo
Ya-qin
YQ
Zhong
Chang-gao
CG
Lu
Guang-xiu
GX
D000328:Adult; D001483:Base Sequence; D004247:DNA / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D004252:DNA Mutational Analysis; D015252:Deoxyribonucleases, Type II Site-Specific / Q000378:metabolism; D012734:Disorders of Sex Development; D005260:Female; D024282:Genes, sry / Q000235:genetics*; D006061:Gonadal Dysgenesis, 46,XY; D006801:Humans; D010641:Phenotype; D017354:Point Mutation
D004247:DNA; C040837:endodeoxyribonuclease MaeII; D015252:Deoxyribonucleases, Type II Site-Specific