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Human XY individuals with inactivating HSD17B3 mutations are born with female-appearing external genitalia due to testosterone deficiency. However, at puberty their testosterone production reactivates, indicating HSD17B3-independent testosterone synthesis. We have recently shown that Hsd17b3 knockout (3-KO) male mice display a similar endocrine imbalance, with high serum androstenedione and testosterone in adulthood, but milder undermasculinization than humans. Here, we studied whether HSD17B1 is responsible for the remaining HSD17B activity in the 3-KO male mice by generating a Ser134Ala point mutation that disrupted the enzymatic activity of HSD17B1 (1-KO) followed by breeding Hsd17b1\/Hsd17b3 double-KO (DKO) mice. In contrast to 3-KO, inactivation of both HSD17B3 and HSD17B1 in mice results in a dramatic drop in testosterone synthesis during the fetal period. This resulted in a female-like anogenital distance at birth, and adult DKO males displayed more severe undermasculinization than 3-KO, including more strongly reduced weight of seminal vesicles, levator ani, epididymis, and testis. However, qualitatively normal spermatogenesis was detected in adult DKO males. Furthermore, similar to 3-KO mice, high serum testosterone was still detected in adult DKO mice, accompanied by upregulation of various steroidogenic enzymes. The data show that HSD17B1 compensates for HSD17B3 deficiency in fetal mouse testis but is not the enzyme responsible for testosterone synthesis in adult mice with inactivated HSD17B3. Therefore, other enzymes are able to convert androstenedione to testosterone in the adult mouse testis and presumably also in the human testis.<\/jats:p>","DOI":"10.1210\/endocr\/bqae056","type":"journal-article","created":{"date-parts":[[2024,5,24]],"date-time":"2024-05-24T12:38:16Z","timestamp":1716554296000},"source":"Crossref","is-referenced-by-count":8,"title":["HSD17B1 Compensates for HSD17B3 Deficiency in Fetal Mouse Testis but Not in Adults"],"prefix":"10.1210","volume":"165","author":[{"given":"Arttu","family":"Junnila","sequence":"first","affiliation":[{"name":"Institute of Biomedicine, Research Centre for Integrative Physiology and Pharmacology, University of Turku , 20520 Turku , Finland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fu-Ping","family":"Zhang","sequence":"additional","affiliation":[{"name":"Institute of Biomedicine, Research Centre for Integrative Physiology and Pharmacology, University of Turku , 20520 Turku , Finland"},{"name":"Turku 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