Abstract
Globozoospermia is a rare phenotype of primary male infertility inducing the production of round-headed spermatozoa without acrosome. Anomalies of DPY19L2 account for 50–70% of all cases and the entire deletion of the gene is by far the most frequent defect identified. Here, we present a large cohort of 69 patients with 20–100% of globozoospermia. Genetic analyses including multiplex ligation-dependent probe amplification, Sanger sequencing and whole-exome sequencing identified 25 subjects with a homozygous DPY19L2 deletion (36%) and 14 carrying other DPY19L2 defects (20%). Overall, 11 deleterious single-nucleotide variants were identified including eight novel and three already published mutations. Patients with a higher rate of round-headed spermatozoa were more often diagnosed and had a higher proportion of loss of function anomalies, highlighting a good genotype phenotype correlation. No gene defects were identified in patients carrying < 50% of globozoospermia while diagnosis efficiency rose to 77% for patients with > 50% of globozoospermia. In addition, results from whole-exome sequencing were scrutinized for 23 patients with a DPY19L2 negative diagnosis, searching for deleterious variants in the nine other genes described to be associated with globozoospermia in human (C2CD6, C7orf61, CCDC62, CCIN, DNAH17, GGN, PICK1, SPATA16, and ZPBP1). Only one homozygous novel truncating variant was identified in the GGN gene in one patient, confirming the association of GGN with globozoospermia. In view of these results, we propose a novel diagnostic strategy focusing on patients with at least 50% of globozoospermia and based on a classical qualitative PCR to detect DPY19L2 homozygous deletions. In the absence of the latter, we recommend to perform whole-exome sequencing to search for defects in DPY19L2 as well as in the other previously described candidate genes.
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TC, CaCa, FM, ZEK, CA, and PFR carried out and interpreted all the molecular work. TC and PFR performed all data analysis. TC and GM designed figures. TC and PR supervised all the patient’s information and SFMB, MK, RZ, AZ, AC, AP, AB, AC, BF, CG, CT, CS, DL, GT, GS, HL, JP, JB, LP, LM, MP, MC, NS, RC, SB, SV, CF, SH, VM, VS, VA contributed to the acquisition of data. TC, ChCo and PFR wrote the main draft of the manuscript. PFR designed the overall study, supervised all molecular laboratory work, had full access to all of the data and takes responsibility for the integrity of the data and its accuracy.
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Celse, T., Cazin, C., Mietton, F. et al. Genetic analyses of a large cohort of infertile patients with globozoospermia, DPY19L2 still the main actor, GGN confirmed as a guest player. Hum Genet 140, 43–57 (2021). https://doi.org/10.1007/s00439-020-02229-0
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DOI: https://doi.org/10.1007/s00439-020-02229-0