RESUMEN
<p><b>OBJECTIVE</b>To observe peripheral blood chromosome abnormality and microdeletions of the SRY and AZF genes on the Y chromosome in patients with chimera Klinefelter syndrome.</p><p><b>METHODS</b>We analyzed the cytogenetic karyotype of the peripheral blood chromosome in 1 infertile patient with mosaic karyotype Klinefelter syndrome and his parents. We identified 9 sequence tagged sites (STS) by multiplex PCR: sY84, sY86, sY127, sY129, sY134, sY254, sY255, sY242, and sY152. Meanwhile we detected the SRYgene and the microdeletion of AZF using ZFX/ZFY as the internal control gene.</p><p><b>RESULTS</b>The karyotype of the patient was 46,XY (12%)/47,XXY (30%)/48,XXYY (56%)/49,XXXXY (2%). The karyotypes of his parents were normal. Consistency was found between the SRY gene and the chromosome gender in the patient and his parents. Y chromosome AZF microdeletion was observed in the patient. The deletion sites were sY86 and sY127, and the deletion type was AZFa + AZFb.</p><p><b>CONCLUSION</b>AZF microdeletion of the Y chromosome exists in patients with Klinefelter syndrome. Chromosome karyotype and Y-chromosome AZF microdeletion are important criteria for the genetic diagnosis of Klinefelter syndrome.</p>