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| 2. |
- Bungum, Leif, et al.
(författare)
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The circadian variation in anti-müllerian hormone in patients with polycystic ovary syndrome differs significantly from normally ovulating women.
- 2013
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Ingår i: PLoS ONE. - : Public Library of Science (PLoS). - 1932-6203. ; 8:9
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Tidskriftsartikel (refereegranskat)abstract
- To improve the biologic understanding of the Polycystic Ovarian Syndrome (PCOS) condition by examining the circadian variation and relationship between Anti Müllerian Hormone (AMH), gonadotropins and ovarian steroids in PCOS patients compared to normally ovulating and menstruating women. By comparing the pattern of co-variation between AMH and Luteinizing Hormone, two compounds closely linked to hyperandrogenism and anovulation in PCOS, the involvement of the Hypothalamic-Pituitary-Ovarian axis in PCOS pathology could be elucidated.
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- Bungum, Mona, et al.
(författare)
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A prospective study, using sibling oocytes, examining the effect of 30 seconds versus 90 minutes gamete co-incubation in IVF.
- 2006
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Ingår i: Human Reproduction. - : Oxford University Press (OUP). - 0268-1161 .- 1460-2350. ; 21:2, s. 518-523
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Tidskriftsartikel (refereegranskat)abstract
- BACKGROUND: Traditionally oocytes have been exposed to sperm overnight, for 16-20 h. This long period of co-incubation, however, has been shown to create problems with high levels of reactive oxygen species (ROS), which may affect embryo viability and cause hardening of the zona pellucida. Recently, a positive effect of reducing the co-incubation time to 90-120 min was reported. The objective of this study was to evaluate whether a further reduction of the co-incubation period could benefit the outcome of IVF. METHODS: In this prospective study, 777 sibling oocytes from 81 women undergoing IVF were divided via alternate allocation to co-incubation for either 30 s (ultrashort co-incubation) (group A) or for 90 min (standard co-incubation) (group B). Endpoints were normal fertilization (two-pronuclear, 2PN), polyspermy (> 2PN), embryo quality (EQ), clinical pregnancy (CP) and implantation (IR). RESULTS: The normal fertilization rates of the two groups were comparable: group A 58.6% versus group B 58.0%. Significantly lower rates of polyspermy were seen in group A compared to group B (2.8 versus 7.2%, P = 0.008). No statistically significant differences in EQ, CP or IR were seen. CONCLUSION: This is the first study demonstrating the achievement of good fertilization rates in IVF with ultrashort co-incubation. Significantly lower rates of polyspermy were seen in the group with ultrashort compared to the standard co-incubation group. Further studies are, however, needed in order to evaluate whether ultrashort co-incubation has any effect on the outcome of IVF.
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| 4. |
- Bungum, Mona, et al.
(författare)
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Polymorphisms in the protein C inhibitor gene in in vitro fertilization failure.
- 2010
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Ingår i: Fertility and Sterility. - : Elsevier BV. - 1556-5653 .- 0015-0282. ; 93:1, s. 277-279
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Tidskriftsartikel (refereegranskat)abstract
- The aim of this study was to determine whether total fertilization failure in human IVF can be partially explained by alterations in the gene that codes for protein C inhibitor. Forty-six men had IVF total fertilization failure and 51 controls with normal fertilization were screened for mutations in the protein C inhibitor gene by direct sequencing. The main finding was that in men involved in total fertilization failure, a heterozygous adenosine/guanine (A/G) base combination in position 1389 (rs2069990) (exon 6) in the protein C inhibitor gene was significantly more common compared with controls (10.9% vs. 0).
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| 6. |
- Bungum, Mona, et al.
(författare)
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Sperm chromatin structure assay (SCSA): a tool in diagnosis and treatment of infertility
- 2011
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Ingår i: Asian Journal of Andrology. - : Medknow. - 1008-682X .- 1745-7262. ; 13:1, s. 69-75
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Forskningsöversikt (refereegranskat)abstract
- Diagnosis of male infertility has mainly been based on the World Health Organization (WHO) manual-based semen parameter's concentration, motility and morphology. It has, however, become apparent that none of these parameters are reliable markers for evaluation of the fertility potential of a couple. A search for better markers has led to an increased focus on sperm chromatin integrity testing in fertility work-up and assisted reproductive techniques. During the last couple of decades, numerous sperm DNA integrity tests have been developed. These are claimed to be characterized by a lower intraindividual variation, less intralaboratory and interlaboratory variation and thus less subjective than the conventional sperm analysis. However, not all the sperm chromatin integrity tests have yet been shown to be of clinical value. So far, the test that has been found to have the most stable clinical threshold values in relation to fertility is the sperm chromatin structure assay (SCSA), a flow cytometric test that measures the susceptibility of sperm DNA to acid-induced DNA denaturation in situ. Sperm DNA fragmentation as measured by SCSA has shown to be an independent predictor of successful pregnancy in first pregnancy planners as well as in couples undergoing intrauterine insemination, and can be used as a tool in investigation, counseling and treatment of involuntary childlessness. More conflicting data exist regarding the role of sperm DNA fragmentation in relation to fertilization, pre-embryo development and pregnancy outcome in in vitro fertilization and intracytoplasmic sperm injection (ICSI). Asian Journal of Andrology (2011) 13, 69-75; doi: 10.1038/aja.2010.73; published online 8 November 2010
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| 8. |
- Bungum, Mona, et al.
(författare)
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Spermatozoa DNA damage measured by sperm chromatin structure assay (SCSA) and birth characteristics in children conceived by IVF and ICSI.
- 2012
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Ingår i: International Journal of Andrology. - : Wiley. - 1365-2605 .- 0105-6263. ; 35:4, s. 485-490
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Tidskriftsartikel (refereegranskat)abstract
- High levels of spermatozoa DNA damage hinder fertility in vivo but not in vitro. It is a source of worry that following in vitro fertilization (IVF) spermatozoa DNA damage, if not repaired by the oocyte, might have a negative impact on the offspring. The aim of this study was to assess if a high spermatozoa DNA Fragmentation Index (DFI) is associated with alterations in birthweight (BW) and/or gestational length in IVF children. One hundred and thirty-one singleton pregnancies established by standard IVF or intracytoplasmic sperm injection (ICSI) were included in the study. DFI was measured by sperm chromatin structure assay (SCSA) in semen samples used for fertilization. DFI was categorized as low and high, using 20, 30, 40 and 50% as cut-off levels. Birthweight, gestational age, as well as gestational age adjusted BW score were used in a linear regression model as end points For none of the tested birth characteristics, statistically significant differences between the groups with low and high DFI were seen regardless of whether 20, 30, 40 or 50% were used as cut-off levels, both when the IVF and ICSI data were merged or analysed separately. Spermatozoa DNA damage as assessed by SCSA is not associated with BW or gestational length in IVF and ICSI children.
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