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Carrières-sous-Poissy, France

Boitrelle F.,Cytogenetics and Gynecology | Boitrelle F.,University of Versailles | Ferfouri F.,Cytogenetics and Gynecology | Ferfouri F.,University of Versailles | And 12 more authors.
Human Reproduction | Year: 2011

Background: An embryos ability to grow and implant can be improved by selection of a normal spermatozoon with a vacuole-free head. However, large vacuoles in spermatozoa have yet to be fully characterized. The present study aimed to determine whether these vacuoles are of nuclear, membrane and/or acrosomal origin. Methods: We studied 15 infertile patients with differing sperm profiles. For each sperm sample, we used high-magnification (×10 000) contrast microscopy to select and assess 30 normal 'top' spermatozoa and 30 spermatozoa with a large sperm-head vacuole (< 25 of the heads cross-sectional area). We subsequently analysed the spermatozoas degree of chromatin condensation (aniline blue staining), DNA fragmentation (terminal deoxyribonucleotidyl transferase-mediated dUTP nick-end labelling assay) and chromosome content (fluorescence in situ hybridization X,Y,18). Atomic force microscopy enabled us to map the plasma sperm membrane in detail. Three-dimensional deconvolution microscopy enabled us to reconstruct images of the nucleus and acrosome in 'top' and 'vacuolated' spermatozoa. Results: We studied a total of 450 'top' spermatozoa and 450 vacuolated spermatozoa. The rate of non-condensed chromatin was higher for 'vacuolated' spermatozoa than for 'top' spermatozoa (36.2 ± 1.9 versus 7.6 ± 1.3, respectively; P < 0.0001). 'Top' and 'vacuolated' spermatozoa did not differ significantly in terms of DNA fragmentation (0.7 ± 0.4 versus 1.3 ± 0.4 respectively; P 0.25) or aneuploidy (1.1 ± 0.5 versus 2.2 ± 0.7 respectively; P 0.21). The majority of aneuploid spermatozoa (9 out of 15) lacked chromatin condensation. In all vacuolated spermatozoa, the acrosome was intact, the plasma membrane was sunken but intact and the large vacuole was identified as an abnormal, 'thumbprint'-like nuclear concavity covered by acrosomal and plasmic membranes. Conclusions: The large vacuole appears to be a nuclear 'thumbprint' linked to failure of chromatin condensation. © 2011 The Author. Source

Hammoud I.,Cytogenetics and Gynecology | Hammoud I.,University of Versailles | Boitrelle F.,Cytogenetics and Gynecology | Boitrelle F.,University of Versailles | And 13 more authors.
Andrologia | Year: 2013

Intracytoplasmic morphologically selected sperm injection (IMSI, 6300× magnification with Nomarski contrast) of a normal spermatozoon with a vacuole-free head could improve the embryo's ability to grow to the blastocyst stage and then implant. However, the most relevant indications for IMSI remain to be determined. To evaluate the potential value of IMSI for patients with a high degree of sperm DNA fragmentation (n = 8), different types of spermatozoa were analysed in terms of DNA fragmentation. Motile normal spermatozoa with a vacuole-free head selected at 6300× magnification had a significantly lower mean DNA fragmentation rate (4.1 ± 1.1%, n = 191) than all other types of spermatozoa: non-selected spermatozoa (n = 8000; 26.1 ± 1.5% versus 4.1 ± 1.1%; P < 0.005), motile spermatozoa (n = 444; 20.8 ± 2.7% versus 4.1 ± 1.1%; P < 0.001) and motile, normal spermatozoa selected at 200× magnification (n = 370; 18.7 ± 2.7% versus 4.1 ± 1.1%; P < 0.001) and then motile, morphometrically normal spermatozoa with anterior vacuoles (n = 368; 15.9 ± 2.9% versus 4.1 ± 1.1%; P < 0.05) or posterior vacuoles (n = 402; 22.5 ± 3.6% versus 4.1 ± 1.1%; P < 0.001) selected at 6300× magnification. For patients with high sperm DNA fragmentation rates, selection of normal spermatozoa with a vacuole-free head (6300×) yields the greatest likelihood of obtaining spermatozoa with non-fragmented DNA. © 2012 Blackwell Verlag GmbH. Source

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