Developmental Disorders of the Lymphatics

An information blog for disorders of the lymphatics. For all articles, please click on "Archives" - Due to spammers, I will no longer allow comments, sorry.

Thursday, February 15, 2007

Y chromosome microdeletion in a case with Klinefelter's Syndrome.

Y chromosome microdeletion in a case with Klinefelter's Syndrome.

Arch Androl. 2006 Nov-Dec

Afyon Kocatepe University, Faculty of Medicine, Department of Medical Biology, Afyon, Turkey.

In male infertility, the frequency of genetic factors is high. Klinefelter's Syndrome is the most frequent sex chromosomal abnormality detected in male infertility. In this study we report a patient diagnosed with Klinefelter's Syndrome with a deletion of the Yq interval. The patient was 24-years old with primary infertility. Semen analyses carried out in triplicate indicated azoospermia. The plasma leutenizing hormone (LH) and follicle stimulating hormone (FSH) levels were abnormally high and the testosterone level was lower than the usual range. Each of his testes had a volume of 3 cc. Peripheral blood karyotype analysis showed Klinefelter's Syndrome (47, XXY) pattern.

Polymerase chain reaction amplification of DNA was performed using the following primers; AZFa (sY81, sY82, sY84), AZFb (sY127, sY142, sY164, RBM1), AZFc (CDY, BPY, sY254, sY255, sY277), AZFd (sY152, sY145, sY153). Analysis revealed a single deletion of AZFa region (sY84). Deletion of the AZFa region may be an additional factor for absolute azoospermia in men with Klinefelter's Syndrome.

For individuals with Klinefelter's Syndrome who plan to undergo assisted reproduction techniques, Y chromosome microdeletion screening can diagnostically be convenient.

Meta Press

Related Article:

Y chromosome microdeletions in azoospermic patients with Klinefelter's syndrome.

Asian J Androl. 2006 Jan

Mitra A,
Dada R,
Kumar R,
Gupta NP,
Kucheria K,
Gupta SK.
Gamete Antigen Laboratory, National Institute of Immunology, Aruna Asaf Ali Marg, New Delhi 110 067, India.

AIM: To study the occurrence of Y chromosome microdeletions in azoospermic patients with Klinefelter's syndrome (KFS).

METHODS: Blood and semen samples were collected from azoospermic patients with KFS (n = 14) and a control group of men of proven fertility (n = 13). Semen analysis was done according to World Health Organization (WHO) guidelines. Blood samples were processed for karyotyping, fluorescent in situ hybridization (FISH) and measurement of plasma follicle stimulating hormone (FSH) by radioimmunoassay. To determine Y chromosome microdeletions, polymerase chain reaction (PCR) of 16 sequence tagged sites (STS) and three genes (DFFRY, XKRY and RBM1Y) was performed on isolated genomic DNA. Testicular fine needle aspiration cytology (FNAC) was done in selected cases.

RESULTS: Y chromosome microdeletions spanning the azoospermia factor (AZF)a and AZFb loci were found in four of the 14 azoospermic patients with KFS. Karyotype and FISH analysis revealed that, of the four cases showing Y chromosome microdeletion, three cases had a 47,XXY/46,XY chromosomal pattern and one case had a 46,XY/47,XXY/48,XXXY/48,XXYY chromosomal pattern. The testicular FNAC of one sample with Y chromosome microdeletion revealed Sertoli cell-only type of morphology. However, no Y chromosome microdeletions were observed in any of the 13 fertile men. All patients with KFS had elevated plasma FSH levels.

CONCLUSION: Patients with KFS may harbor Y chromosome microdeletions and screening for these should be a part of their diagnostic work-up, particularly in those considering assisted reproductive techniques.

Asian Journal of Andrology

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