What is AZFc deletion?
Azoospermic factor c (AZFc) deletions are a common molecular cause of spermatogenic failure with a frequency of about 10% in men with non-obstructive azoospermia or severe oligozoospermia (Vogt et al., 1996; Kuroda-Kawaguchi et al., 2001).
Can a mutation be on the Y chromosome?
The human Y chromosome is particularly exposed to high mutation rates due to the environment in which it is housed. The Y chromosome is passed exclusively through sperm, which undergo multiple cell divisions during gametogenesis. Each cellular division provides further opportunity to accumulate base pair mutations.
What is affected by AZFc deletion?
In fact, deletions affecting the AZFc region are the most common known genetic cause of severe spermatogenic failure (SSF), defined by a sperm count of less than five million per milliliter of semen in the absence of physical obstruction.
Is Y chromosome infertility inherited?
Because Y chromosome infertility impedes the ability to father children, this condition is usually not inherited. Most cases of this condition result from new (de novo) deletions on the Y chromosome that occur during formation of sperm cells in an affected individual’s father who is not himself infertile.
How common is Y chromosome deletion?
Prevalence. The prevalence of Y chromosome deletions and microdeletions is estimated at 1:2,000 to 1:3,000 males [de Vries et al 2002; de Vries et al, personal communication]. The frequency of Yq microdeletions in males with azoospermia or severe oligozoospermia is about 5% [Kim et al 2017].
Does male infertility run in families?
Studies have proved that unfortunately, male factor infertility can be passed down genetically. Sons conceived with the help of fertility treatments like IVF and sperm micro-injection (ICSI) are more likely to require the same kind of help to conceive themselves.
Can Y chromosome microdeletions of the AZFc region be caused by natural transmission?
We noted Y chromosome microdeletions of the AZFc region in a selected group of patients, who had received their Y chromosome by natural transmission. These data are supported by a report of ambiguous genitalia, 45X/46XY mosaic karyotype, and Y chromosome microdeletions in a 17-year-old man.
What are the most common types of Y chromosome deletions?
The most common types of deletion are AZFc deletions, which are located in the distal portion of Yq, and account for more than 80% of all reported types of Y microdeletions. The human Y chromosome and male infertility.
Can chromosomal mosaicism contribute to spermatogenic failure in men with AZFc deletions?
Previously we reported that a subgroup of infertile men with AZFc deletions showed a 45X/46XY chromosomal mosaicism in peripheral blood lymphocytes. Sex chromosome mosaicism in males carrying Y chromosome long arm deletions. Such mosaicism might aggravate the spermatogenic failure.
Does azoospermia factor C deletion affect embryo quality in oligozoospermic men?
Decreased fertilization rate and embryo quality after ICSI in oligozoospermic men with microdeletions in the azoospermia factor c region of the Y chromosome. Previously we reported that a subgroup of infertile men with AZFc deletions showed a 45X/46XY chromosomal mosaicism in peripheral blood lymphocytes.