From exome analysis in idiopathic azoospermia to the identification of a high-risk subgroup for occult Fanconi anemia.
Genet Med
; 21(1): 189-194, 2019 01.
Article
in En
| MEDLINE
| ID: mdl-29904161
ABSTRACT
PURPOSE:
In about 10% of patients affected by Fanconi anemia (FA) the diagnosis is delayed until adulthood, and the presenting symptom in these "occult" FA cases is often a solid cancer and cancer treatment-related toxicity. Highly predictive clinical parameter(s) for diagnosing such an adult-onset cases are missing.METHODS:
(1) Exome sequencing (ES), (2) Sanger sequencing of FANCA, (3) diepoxybutane (DEB)-induced chromosome breakage test.RESULTS:
ES identified a pathogenic homozygous FANCA variant in a patient affected by Sertoli cell-only syndrome (SCOS) and in his azoospermic brother. Although they had no overt anemia, chromosomal breakage test revealed a reverse somatic mosaicism in the former and a typical FA picture in the latter. In 27 selected SCOS cases, 1 additional patient showing compound heterozygous pathogenic FANCA variants was identified with positive chromosomal breakage test.CONCLUSION:
We report an extraordinarily high frequency of FA in a specific subgroup of azoospermic patients (7.1%). The screening for FANCA pathogenic variants in such patients has the potential to identify undiagnosed FA before the appearance of other severe clinical manifestations of the disease. The definition of this high-risk group for "occult" FA, based on specific testis phenotype with mild/borderline hematological alterations, is of unforeseen clinical relevance.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Fanconi Anemia Complementation Group A Protein
/
Azoospermia
/
Sertoli Cell-Only Syndrome
/
Fanconi Anemia
Type of study:
Diagnostic_studies
/
Etiology_studies
/
Prognostic_studies
/
Risk_factors_studies
Limits:
Adult
/
Female
/
Humans
/
Male
Language:
En
Journal:
Genet Med
Journal subject:
GENETICA MEDICA
Year:
2019
Document type:
Article
Affiliation country:
Italy