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Hum. Reprod. Advance Access originally published online on April 22, 2004
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Human Reproduction, Vol. 19, No. 6, 1438-1447, June 2004
© 2004 European Society of Human Reproduction and Embryology

Sperm proteome mapping of a patient who experienced failed fertilization at IVF reveals altered expression of at least 20 proteins compared with fertile donors: Case report

Katherine L. Pixton1, Emma D. Deeks1, Frits M. Flesch1, Fleur L.C. Moseley1,3, Lars Björndahl1,3, Peter R. Ashton2, Christopher L.R. Barratt1,3,4 and Ian A. Brewis1,3

1 The Reproductive Biology and Genetics Group, Division of Medical Sciences, School of Medicine, 2 School of Chemical Sciences, The University of Birmingham, Birmingham B15 2TT and 3 The Assisted Conception Unit, Birmingham Women’s Hospital, Birmingham B15 2TG, UK

4 To whom correspondence should be addressed. e-mail: c.l.barratt{at}bham.ac.uk

The aim of this study was to compare the sperm protein expression profile (proteome map) from a patient who experienced failed fertilization at IVF with fertile controls. One patient and three fertile donor sperm samples were characterized using two-dimensional electrophoresis. Differences in protein expression were established using gel analysis software before attempted protein identification. Gel analysis of the fertile donor proteome maps revealed excellent reproducibility as well as very low intra-donor and inter-donor variability in the presence of protein spots. In the patient samples, we have noted 20 consistent differences in protein expression (six spots missing, three additional spots, four less abundant, seven more abundant) compared with the controls. Two proteins that were more intense in the patient have been conclusively identified as secretory actin-binding protein and outer dense fibre protein 2/2. In conclusion proteome variation between different fertile donors was very low. In contrast, the patient proteome exhibited 20 differences compared with controls, which we believe is an underestimate. These proteins merit further investigation to determine whether failed fertilization at IVF might be caused by abnormalities in their expression. This case report represents a proof of principle that proteomics may be useful to study defects in sperm function.

Key words: infertility/IVF/proteomics/spermatozoa/unexplained infertility


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