Y chromosome assessment and its implications for the development of ICSI children.

Overview

abstract

The aetiology of compromised spermatogenesis is often genetic in nature. There are only a few reports of father/son cohorts that have been evaluated to assess heritability of mutations associated with male factor infertility and the psychological well-being of the children. In the present study, multiple tissues were sampled from consenting male patients and their sons derived from intracytoplasmic sperm injection (ICSI) and underwent chromosomal and genetic analyses. Paediatric and psychological examinations were also conducted. In 87 men and 47 boys, 22 sequence tagged sites (STS) were analysed by multiplex PCR and deletion breakpoints were defined with additional loci. In one patient, the breakpoints map to the highly unstable palindrome-rich region within AZFb and proximal AZFc was investigated. A total of 86 blood, 26 semen, and 73 cheek cells samples were collected from adults, and 36 blood samples and 44 cheek cell specimens were obtained from the boys. Though all of the fathers had normal karyotypes, the incidence of chromosomal abnormalities in the somatic cells of male progeny was 8.3% (3/36). The incidence of germ line aneuploidy in these men was 0.5-2.8%. A CF mutation (Delta508) was detected in one of 87 men (1.2%) and microdeletions in Yq AZF were detected in 3.4% of 87 adults and in 2.1% of their sons (n = 47). In conclusion, screening for Y chromosome microdeletions provides crucial information in the counselling of couples seeking infertility treatment. Moreover, DNA extraction and Y deletion assessments of cheek cells provide a non-invasive approach. Inheritance of Yq deletions appears not to affect the psychological and physical development of children derived from ICSI.