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From the * Department of Génétique
et Reproduction and Department of
Gynécologie Obstétrique, Hôpital Antoine
Béclère, Clamart, France.
| Correspondence to: Dr François M. Petit, Service de Génétique et reproduction, Hôpital Antoine Béclère 157, rue de la Porte de Trivaux 92141 Clamart, France. |
| Received for publication June 20, 2004; accepted for publication September 17, 2004. |
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Abstract |
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Key words: Chromosomal profile, fluorescent in situ hybridization, spermatozoa
Since 1992, intracytoplasmic sperm injection (ICSI) has been used successfully to treat male infertility (Palermo et al, 1992). However, during ICSI procedure, spermatozoon nuclear quality is never known. Fluorescent in situ hybridization (FISH) on oligoasthenoteratozoospermia (OAT) patient spermatozoa suggests that male infertility is a risk factor for chromosomal abnormalities in sperm nuclei (In't Veld et al, 1995; Bernardini et al, 1997; Aran et al, 1999; Pang et al, 1999; Acar et al, 2000; Schultz et al, 2000; Ushijima et al, 2000; Härkönen et al, 2001). In recent studies, authors have established a correlation between semen parameters (sperm concentration, motility, morphology) and sperm aneuploidy rate (Vegetti et al, 2000; Calogero et al, 2001). So ICSI is considered as a situation at genetic risk for the offspring, and recent observations suggest that high sperm aneuploidy may have a negative impact on the success of the ICSI procedure (Pang et al, 1999; Rubio et al, 2001).
In order to determine the validity of sperm aneuploidy determination as a predictive test for ICSI success, we analyzed chromosomal abnormalities in sperm from 2 subpopulations of ICSI patients: men who did not achieve an ICSI success after at least 4 attempts and men who achieved an ICSI success after 1 to 3 attempts.
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Materials and Methods |
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All the patients had a normal 46,XY karyotype. All the women had a normal 46,XX karyotype.
Sperm Preparation and Sperm Head Swelling
After liquefaction at 37°C for 30 minutes, each semen sample was
prepared using the PureSperm (JCD, Lyon, France) migration technique if
progressive sperm mobility was upper 5%, or a simple wash in Ferticult (JCD)
if progressive sperm mobility ranged from 0% to 5%. Each pellet was then
washed in Ferticult (JCD). After centrifugation at 500 x g, the
pellets were resuspended in Carnoy's solution (methanol/acetic acid 3:1).
Sperm preparations were dropped onto slides and air dried.
The sperm head decondensation was performed using NaOH solution (1 mol/L) for 2 minutes at room temperature (Frydman et al, 2001).
Chromosome Probes
To detect sperm aneuploidy for chromosomes 13, 18, 21, X, and Y, we used a
commercial kit AneuvysionTM (Vysis, Downers Grove, Ill) with DNA probes
specific for chromosome 13 (LSI 13 SpectrumGreenTM [Vysis, Downers Grove,
Ill] 13q14) and for chromosome 21 (LSI 21 SpectrumOrangeTM [Vysis,
Downers Grove, Ill] 21q22.13-q22.2) and DNA probes specific for chromosome 18
(CEP 18 SpectrumAquaTM [Vysis, Downers Grove, Ill] 18p11.1-q11.1), for
chromosome X (CEP X SpectrumGreenTM Xp11.1-q11.1) and for chromosome Y
(CEP Y SpectrumOrangeTM Yp11.1-q11.1). We used DNA probes (Vysis, Downers
Grove, Ill) specific for chromosome 8 (CEP 8 SpectrumOrangeTM
8p11.1-q11.1) and for chromosome 9 (CEP 9 SpectrumGreenTM 9p11.1-q11.1)
in 1:2 mixture allowing to obtain good hybridization signals
(Figure). Hybridization
frequencies were tested on 100 normal male lymphocyte metaphases per probe and
were 100%.
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Fluorescent In Situ Hybridization
Before hybridization, sperm DNA slides were dehydrated in ethanol (70%,
90%, and 100%) and air dried. Three microliters of DNA probes mixture were
applied to the sperm nucleus preparation and then covered with a coverslip and
sealed with rubber cement. The denaturation was performed simultaneously for
sperm nuclei and probes for 1 minute at 73°C for centromeric probes and
for 2 minutes at 73°C for locus specific probes. Slides were then
hybridized in a dark, moist chamber at 37°C for 15 to 18 hours. The
coverslips were then removed and slides were washed for 2 minutes in 0.4
x SSC 0.3% NP40 solution at 73°C and for 30 seconds in 2.0 x
SSC 0.1% NP40 solution at room temperature. Nuclei were then counterstained
with 4,6-diamino-2-phenylindole dihydrochloride (DAPI) in an antifade solution
(Vectashield, Vector Laboratories, Burlingame, Calif).
Dual color FISH slides were screened using an X-100 objective on an Olympus epifluorescent microscope equipped with fluoresceine isothiocyanate (FITC)/rhodamine double band-pass filter. Aqua FISH slides were screened using an X-64 objective on a Zeiss epifluorescent microscope equipped with aqua, fluoresceine isothiocyanate (FITC) and rhodamine single band-pass filters. A total of 1000 sperm nuclei were counted for each probe. Only individual and well-delineated spermatozoa were scored. We used the scoring criteria defined by Martin and Rademaker (1995). A spermatozoon was scored as disomic if it showed 2 hybridization signals of the same color, size, and intensity. Two spots separated by less than the diameter of 1 hybridization domain were scored as a single signal. The absence of hybridization signal for a single chromosome was scored as nullisomy for this chromosome only when the other probed chromosome gave a signal. The aneuploidy rate was determined by the sum of nullisomy and disomy rates.
Statistical Analysis
Aneuploidy and diploidy rates were compared among groups A, B, and C.
Unpaired t test or Kruskal-Wallis test were used as appropriate.
Differences were considered to be statistically significant when the
probability value was less than .05.
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Results |
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Men's characteristics and determination of aneuploidy rates are indicated in Tables 3, 4, 5, 6. There was no statistical difference for semen parameters and for age between men in groups A and B. In group A, the aneuploidy rate varied from 0.83% for chromosome 9 to 2.22% for chromosome 13. The diploidy rate was 0.52%. In group B, the aneuploidy rate varied from 0.50% for chromosome 8 to 0.81% for chromosomes 13 and 21. The diploidy rate was 0.29%. In group C, the aneuploidy rate varied from 0.13% for chromosomes X/Y to 0.22% for chromosome 8. The diploidy rate was 0.12%. Aneuploidy (disomy plus nullisomy) rates for studied chromosomes and diploidy rate were significantly increased in group A and B compared with the control population (P < .05). The sum of aneuploidy rates for chromosomes 8, 9, 13, 18, 21, X, and Y (total aneuploidy rate) were compared in the 3 groups. It was significantly higher in ICSI patients (groups A and B) than in controls (group C). Total aneuploidy rate was significantly increased in patients with ICSI failures (group A) compared with patients who fathered after fewer than 4 ICSI treatments (group B).
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Discussion |
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Normal karyotype determination on blood lymphocyte cells does not exclude cytogenetic abnormalities in sperm (Calogero et al, 2003). In our series, sperm aneuploidy for each chromosome was higher in OAT patients than in normal semen men. Over the past decade, several studies have been conducted about cytogenetic analysis using fluorescent in situ hybridization (FISH) on spermatozoa from infertile men. Martin (1996) suggested that ICSI with poor quality sperm is a situation at risk of transmitting chromosomal abnormalities to offspring. For Rubio et al (2001), men with implantation failure (IF) after ICSI are at risk of showing sperm chromosomal abnormalities. In their study, IF patients had variable semen parameters (normozoospermia, asthenozoospermia, teratozoospermia), and there was no information about women investigations. Aneuploidy rates from IF patients were not compared with aneuploidy rates from patients who obtained a pregnancy.
In our study, male and female characteristics were analyzed. There was no difference between groups A and B for male and female characteristics (Table 6). Considering first steps of in vitro embryo development, we did not observe any relevant difference for number or morphology of blastomeres between group A and group B (Tables 1 and 2). Neither the sperm parameters or embryo morphology can predict ICSI success for OAT patients. Only fertilization rate was decreased in group A in comparison with group B. Aneuploidy rates observed in groups A and B were compared with the presence or absence of biochemical pregnancy in order to determine the impact of sperm aneuploidy on ICSI success.
Considering groups, aneuploidy rates were statistically higher in group A than in group B. No correlation was established between sperm aneuploidy and numeration, motility or morphology. Considering each patient individually, results of aneuploidy determination were variable between each studied chromosome (Table 6). We conclude that analysis of 1 chromosome in sperm is not sufficient to predict ICSI success because it cannot reflect genetic risk for the whole chromosome. We propose the analysis of 7 chromosomes together in order to have a global vision of the aneuploidy risk.
We compared the total sperm aneuploidy (sum of the aneuploidy rates measured for chromosomes 8, 9, 13, 18, 21, X, and Y) in groups A and B. A rate above 5% seems to be negative for ICSI (7 of 9 in group A, 1 of 8 in group B). Our results agreed with results of Burrello et al (2003), who have shown that an aneuploidy rate for chromosomes 8, 12, 18, X, and Y above 1.55% has a negative impact on ICSI outcome. This limit was fixed by analyzing 14 normozoospermic healthy men.
We propose that sperm aneuploidy analysis for at least 7 chromosomes could be used as an additional predictive test before ICSI for 46,XY men. This test could be used in 2 therapeutic schemas. First, aneuploidy determination in sperm could be proposed to each couple before the first ICSI as predictive test. Second, this test could be proposed in second intention as a diagnostic test after 3 ICSI failures. Thus, an aneuploidy rate less than or equal to 5% could lead to an ICSI attempt, whereas aneuploidy rate more than 5% could convince the couple to have a genetic counseling and to discuss preimplantation genetic diagnosis for aneuploidies (Voullaire et al, 2002; Munné, 2003).
In conclusion, these results suggest that chromosomal sperm nuclei profile could be used as a predictive test before ICSI in order to improve genetic counseling for OAT patients. Further studies are needed to determine the chromosomes to analyze and the threshold to be used.
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Acknowledgments |
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