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Mol Cytogenet. 2014 Feb 21;7(1):14. doi: 10.1186/1755-8166-7-14.

Cytogenetic and molecular analyses of de novo translocation dic(9;13)(p11.2;p12) in an infertile male.

Molecular cytogenetics

Ewa Wiland, Marta Olszewska, Andrew Georgiadis, Nataliya Huleyuk, Barbara Panasiuk, Danuta Zastavna, Svetlana A Yatsenko, Piotr Jedrzejczak, Alina T Midro, Alexander N Yatsenko, Maciej Kurpisz

Affiliations

  1. Institute of Human Genetics Polish Academy of Sciences, Department of Reproductive Biology and Stem Cells, Strzeszynska 32, Poznan 60-479, Poland. [email protected].

PMID: 24559467 PMCID: PMC3944724 DOI: 10.1186/1755-8166-7-14

Abstract

BACKGROUND: Whole arm t(9;13)(p11;p12) translocations are rare and have been described only a few times; all of the previously reported cases were familial.

RESULTS: We present here an infertile male carrier with a whole-arm reciprocal translocation dic(9;13)(p11.2;p12) revealed by GTG-, C-, and NOR-banding karyotypes with no mature sperm cells in his ejaculate. FISH and genome-wide 400 K CGH microarray (Agilent) analyses demonstrated a balanced chromosome complement and further characterised the abnormality as a dicentric chromosome (9;13): dic(9;13)(pter→p11.2::p12→qter),neo(9)(pter→p12→neo→p11.2). An analysis of the patient's ejaculated cells identified immature germ cells at different phases of spermatogenesis but no mature spermatozoa. Most (82.5%) of the germ cells were recognised as spermatocytes at stage I, and the cell nuclei were most frequently found in pachytene I (41.8%). We have also undertaken FISH analysis and documented an increased rate of aneuploidy of chromosomes 15, 18, X and Y in the peripheral blood leukocytes of our patient. To study the aneuploidy risk in leukocytes, we have additionally included 9 patients with non-obstructive azoospermia with normal karyotypes.

CONCLUSIONS: We propose that the azoospermia observed in the patient with the dic(9;13)(p11.2;p12) translocation was most likely a consequence of a very high proportion (90%) of association between XY bivalents and quadrivalent formations in prophase I.

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