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2014 ; 2
(1
): 5-19
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English Wikipedia
EAA/EMQN best practice guidelines for molecular diagnosis of Y-chromosomal
microdeletions: state-of-the-art 2013
#MMPMID24357628
Krausz C
; Hoefsloot L
; Simoni M
; Tüttelmann F
Andrology
2014[Jan]; 2
(1
): 5-19
PMID24357628
show ga
The molecular diagnosis of Y-chromosomal microdeletions is a common routine
genetic test which is part of the diagnostic workup of azoospermic and severe
oligozoospermic men. Since 1999, the European Academy of Andrology (EAA) and the
European Molecular Genetics Quality Network (EMQN) have been actively involved in
supporting the improvement of the quality of the diagnostic assays by publication
of the laboratory guidelines for molecular diagnosis of Y-chromosomal
microdeletions and by offering external quality assessment trials. The present
revision of the 2004 laboratory guidelines summarizes all the clinical novelties
related to the Y chromosome (classic, partial and gene-specific deletions,
genotype-phenotype correlations, methodological issues) and provides an update on
the results of the quality control programme. These aspects also reflect the
consensus of a large group of specialists present at a round table session during
the recent Florence-Utah-Symposium on 'Genetics of male infertility' (Florence,
19-21 September, 2013). During the last 10 years the gr/gr deletion has been
demonstrated as a significant risk factor for impaired sperm production. However,
the screening for this deletion type in the routine diagnostic setting is still a
debated issue among experts. The original basic protocol based on two multiplex
polymerase chain reactions remains fully valid and appropriate for accurate
diagnosis of complete AZF deletions and it requires only a minor modification in
populations with a specific Y chromosome background. However, in light of novel
data on genotype-phenotype correlations, the extension analysis for the AZFa and
AZFb deletions is now routinely recommended. Novel methods and kits with
excessively high number of markers do not improve the sensitivity of the test,
may even complicate the interpretation of the results and are not recommended.
Annual participation in an external quality control programme is strongly
encouraged. The 12-year experience with the EMQN/EAA scheme has shown a steep
decline in diagnostic (genotyping) error rate and a simultaneous improvement on
reporting practice.
|*Genotyping Techniques/methods
[MESH]
|*Infertility, Male/genetics
[MESH]
|*Molecular Diagnostic Techniques/methods
[MESH]
|*Sex Chromosome Disorders of Sex Development/diagnosis
[MESH]