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Mol. Hum. Reprod. Advance Access originally published online on October 14, 2008
Molecular Human Reproduction 2008 14(11):635-640; doi:10.1093/molehr/gan057
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© The Author 2008. Published by Oxford University Press on behalf of the European Society of Human Reproduction and Embryology. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Fertility in a i(Xq) Klinefelter patient: importance of XIST expression level determined by qRT-PCR in ruling out Klinefelter cryptic mosaicism as cause of oligozoospermia

M. Stabile1,2, T. Angelino2, F. Caiazzo2, P. Olivieri2, N. De Marchi3, L. De Petrocellis4 and P. Orlando5,6

1Medical Genetic Department, A.S.L. ‘Cardarelli’, Napoli, Italy 2 Genetic Counseling Center ‘Zigote’, Salerno, Italy 3ARSan, Agenzia Regionale Sanitaria della Campania, Napoli, Italy 4Institute of Cybernetic ‘E.Caianiello’, CNR, via C. Flegrei Pozzuoli, Napoli, Italy 5Institute of Protein Biochemistry, CNR, via P. Castellino 111, Napoli, Italy

6 Correspondence addressed. E-mail: p.orlando{at}ibp.cnr.it

The presence of an isochromosome Xq in Klinefelter syndrome (KS) is an apparently rare condition. In all cases reported so far, patients showed the classic phenotype. We here describe a case of isochromosome Xq [47,X,i(Xq),Y] in a non-mosaic KS patient. The patient exhibited a normal androgenized phenotype, normal testes and normal cognitive abilities. Semen analysis revealed a medium oligozoospermia (5 x 106 spermatozoa/ml). After the patient underwent intracytoplasmic sperm injection, he generated two cytogenetically healthy normal females. Fluorescence in situ hybridization analysis showed the presence of a dicentric Xq chromosome that did not show the presence of residual Xp arm up to the 57,820,478 bp position (Xp 1.1) of X chromosome sequence. Preferential inactivation of Xq isochromosome was demonstrated by bromodeoxyuridine replication analysis and transcriptional silencing by DNA methylation at the HUMARA locus. Furthermore, we demonstrated by quantitative RT–PCR an active XIST RNA expression in blood lymphocytes from Klinefelter patients, comparable to that observed in control females and over 30 000-fold greater than in control males. In conclusion, this qRT–PCR approach could be useful for screening of prepuberty males and for diagnosis or exclusion of cryptic Klinefelter mosaics.

Key words: Klinefelter syndrome/isochromosome Xq/XIST expression/fertility

Submitted on July 11, 2008; resubmitted on September 27, 2008; accepted on October 1, 2008.


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