Lab Med Online.  2018 Oct;8(4):148-155. 10.3343/lmo.2018.8.4.148.

Genetic Screening for Chromosomal Abnormalities and Y Chromosome Microdeletions in 846 Infertile Korean Men

Affiliations
  • 1Bio-Core Co. Ltd., Biotechnology, Yongin, Korea. hansungh@bio-core.com
  • 2Department of Male Reproductive Medicine, Onetop Clinic, Seoul, Korea.
  • 3Seoul Clinical Laboratories, Yongin, Korea.

Abstract

BACKGROUND
Chromosomal abnormalities are confirmed as one of the frequent causes of male infertility. The microdeletion of the azoospermia factor (AZF) region in the Y chromosome was discovered as another frequent genetic cause associated with male infertility. The aim of this study was to evaluate the frequency and type of chromosomal abnormalities and Y chromosome microdeletions in Korean infertile men.
METHODS
A total of 846 infertile men with azoospermia and severe oligozoospermia were included for genetic screening. Cytogenetic analyses using G-banding and screening for Y chromosome microdeletions by multiplex PCR for AZF genes were performed.
RESULTS
Chromosomal abnormalities were detected in 112 infertile men (13.2%). Of these, Klinefelter's syndrome was the most common (55.4%, 62/112), followed by balanced translocation including translocation between sex chromosome and autosome (14.3%), Yq deletion (13.4%), X/XY mosaicism with Yq deletion (12.5%), and XX male (4.5%). The overall prevalence of Y chromosome microdeletions was 9.2% (78/846). Most microdeletions were in the AZFc region (51.3%) with a low incidence in AZFa (7.7 %) and AZFb (6.4 %). Combined deletions involving the AZFbc and AZFabc regions were detected in 26.9 % and 7.7 % of men, respectively. Among the infertile men with Y chromosome microdeletions, the incidence of chromosomal abnormality was 25.6% (20/78).
CONCLUSIONS
There was a high incidence (20.1%) of chromosomal abnormalities and Y chromosome microdeletions in Korean infertile men. These findings strongly suggest that genetic screening for chromosomal abnormalities and Y chromosome microdeletions should be performed, and genetic counseling should be provided before starting assisted reproductive techniques.

Keyword

Male infertility; Chromosomal abnormalities; Y chromosome microdeletions; Azoospermia factor (AZF)
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