Browsing by Author "Oud, Manon S."
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- Bi-allelic Mutations in M1AP Are a Frequent Cause of Meiotic Arrest and Severely Impaired Spermatogenesis Leading to Male InfertilityPublication . Wyrwoll, Margot J.; Temel, Şehime G.; Nagirnaja, Liina; Oud, Manon S.; Lopes, Alexandra M.; van der Heijden, Godfried W.; Heald, James S.; Rotte, Nadja; Wistuba, Joachim; Wöste, Marius; Ledig, Susanne; Krenz, Henrike; Smits, Roos M.; Carvalho, Filipa; Gonçalves, João; Fietz, Daniela; Türkgenç, Burcu; Ergören, Mahmut C.; Çetinkaya, Murat; Başar, Murad; Kahraman, Semra; McEleny, Kevin; Xavier, Miguel J.; Turner, Helen; Pilatz, Adrian; Röpke, Albrecht; Dugas, Martin; Kliesch, Sabine; Neuhaus, Nina; Aston, Kenneth I.; Conrad, Donald F.; Veltman, Joris A.; Friedrich, Corinna; Tüttelmann, FrankMale infertility affects ∼7% of men, but its causes remain poorly understood. The most severe form is non-obstructive azoospermia (NOA), which is, in part, caused by an arrest at meiosis. So far, only a few validated disease-associated genes have been reported. To address this gap, we performed whole-exome sequencing in 58 men with unexplained meiotic arrest and identified the same homozygous frameshift variant c.676dup (p.Trp226LeufsTer4) in M1AP, encoding meiosis 1 associated protein, in three unrelated men. This variant most likely results in a truncated protein as shown in vitro by heterologous expression of mutant M1AP. Next, we screened four large cohorts of infertile men and identified three additional individuals carrying homozygous c.676dup and three carrying combinations of this and other likely causal variants in M1AP. Moreover, a homozygous missense variant, c.1166C>T (p.Pro389Leu), segregated with infertility in five men from a consanguineous Turkish family. The common phenotype between all affected men was NOA, but occasionally spermatids and rarely a few spermatozoa in the semen were observed. A similar phenotype has been described for mice with disruption of M1ap. Collectively, these findings demonstrate that mutations in M1AP are a relatively frequent cause of autosomal recessive severe spermatogenic failure and male infertility with strong clinical validity.
- Diverse monogenic subforms of human spermatogenic failurePublication . Nagirnaja, Liina; Lopes, Alexandra M.; Charng, Wu-Lin; Miller, Brian; Stakaitis, Rytis; Golubickaite, Ieva; Stendahl, Alexandra; Luan, Tianpengcheng; Friedrich, Corinna; Mahyari, Eisa; Fadial, Eloise; Kasak, Laura; Vigh-Conrad, Katinka; Oud, Manon S.; Xavier, Miguel J.; Cheers, Samuel R.; James, Emma R.; Guo, Jingtao; Jenkins, Timothy G.; Riera-Escamilla, Antoni; Barros, Alberto; Carvalho, Filipa; Fernandes, Susana; Gonçalves, João; Gurnett, Christina A.; Jørgensen, Niels; Jezek, Davor; Jungheim, Emily S.; Kliesch, Sabine; McLachlan, Robert I.; Omurtag, Kenan R.; Pilatz, Adrian; Sandlow, Jay I.; Smith, James; Eisenberg, Michael L.; Hotaling, James M.; Jarvi, Keith A.; Punab, Margus; Rajpert-De Meyts, Ewa; Carrell, Douglas T.; Krausz, Csilla; Laan, Maris; O’Bryan, Moira K.; Schlegel, Peter N.; Tüttelmann, Frank; Veltman, Joris A.; Almstrup, Kristian; Aston, Kenneth I.; Conrad, Donald F.Non-obstructive azoospermia (NOA) is the most severe form of male infertility and typically incurable. Defining the genetic basis of NOA has proven chal lenging, and the most advanced classification of NOA subforms is not based on genetics, but simple description of testis histology. In this study, we exome sequenced over 1000 clinically diagnosed NOA cases and identified a plausible recessive Mendelian cause in 20%. We find further support for 21 genes in a 2-stage burden test with 2072 cases and 11,587 fertile controls. The disrupted genes are primarily on the autosomes, enriched for undescribed human “knockouts”, and, for the most part, have yet to be linked to a Mendelian trait. Integration with single-cell RNA sequencing data shows that azoospermia genes can be grouped into molecular subforms with synchronized expression patterns, and analogs of these subforms exist in mice. This analysis framework identifies groups of genes with known roles in spermatogenesis but also reveals unrecognized subforms, such as a set of genes expressed across mitotic divisions of differentiating spermatogonia. Our findings highlight NOA as an understudied Mendelian disorder and provide a conceptual structure for organizing the complex genetics of male infertility, which may provide a rational basis for disease classification