A frequent Y chromosome b2/b3 subdeletion shows strong association with male infertility in Han-Chinese population

BACKGROUND Azoospermia factor c (AZFc) subdeletions were reported to be significant risk factors for spermatogenesis. In this study, we assessed the occurrence of classical AZF deletions and AZFc subdeletions and their impact on male infertility in a Han-Chinese population. METHODS This study analys...

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Bibliographic Details
Published in:Human reproduction (Oxford) 2007-04, Vol.22 (4), p.1107-1113
Main Authors: Wu, B., Lu, N.X., Xia, Y.K., Gu, A.H., Lu, C.C., Wang, W., Song, L., Wang, S.L., Shen, H.B., Wang, X.R.
Format: Article
Language:English
Subjects:
Adult
AZFc
Azoospermia
b2/b3 subdeletion
Biological and medical sciences
China
Chromosome Deletion
Chromosomes, Human, Y
Fertility
Gene Deletion
Genetic Markers
gr/gr subdeletion
Gynecology. Andrology. Obstetrics
Haplotypes
Humans
Infertility, Male - ethnology
Infertility, Male - genetics
Male
male infertility
Medical sciences
Polymerase Chain Reaction
Retrospective Studies
Y chromosome microdeletion
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Summary:BACKGROUND Azoospermia factor c (AZFc) subdeletions were reported to be significant risk factors for spermatogenesis. In this study, we assessed the occurrence of classical AZF deletions and AZFc subdeletions and their impact on male infertility in a Han-Chinese population. METHODS This study analysed a population of 699 subjects, including 451 idiopathic infertile patients with a range of fertility disorders and 248 fertile controls, using a retrospective design. Deletions were identified by multiplex PCR. RESULTS The prevalence and phenotypes of the classical AZF deletions were similar to previous studies. Subdeletions of the AZFc region in patients showed similar overall frequencies in all sperm concentration categories of gr/gr (7.0%) and b2/b3 (8.9%). For controls, these subdeletions were also found with a prevalence of gr/gr (7.7%) and b2/b3 (3.2%). b1/b3 deletions were not found either in the patients or in the controls. CONCLUSION Our data showed a higher frequency of deletion events in this Han-Chinese population than in populations elsewhere in the world. The classical AZF deletions were the primary genetic factors for spermatogenic failure, while no significant association was found for AZFc subdeletions with sperm concentration. However, the b2/b3 subdeletion was significantly associated with idiopathic male infertility (odds ratio, 2.93; 95% confidence interval 1.34–6.39) (P = 0.005), indicating a potential impairment of male fertility.
ISSN:0268-1161
1460-2350
DOI:10.1093/humrep/del499