男性假两性畸形——17β-羟类固醇脱氢酶3型缺陷症研究

目的 本研究通过对一例l7β-羟类固醇脱氢酶(1713-HSD)3型缺陷症的临床诊断及基因检测,探讨其病理生理及发病机制.方法 总结分析该家系临床资料,通过激素测定和hCG兴奋试验确认其临床诊断;收集该家系先证者及其父母的外周血,通过PCR扩增产物直接测序和亚克隆方法检测其基因突变,确认其基因诊断.结果 该患者社会性别为女性,以"原发性闭经"就诊;染色体核型为46,XY,双侧腹股沟隐睾,呈男性假两性畸形.激素测定显示睾酮合成前体物质如硫酸脱氢表雄酮、雄烯二酮明显升高,而睾酮却低于正常.hCG兴奋试验提示雄烯二酮转化为睾酮过程受阻,即17β-HSD3活性缺陷.基因诊断证实HSD17B3 基因第一外显子存在4个碱基缺失(172-175del).结论 青春期出现男性化表现伴乳腺发育时应考虑该症可能,hCG试验可提供临床依据,基因诊断可进一步确诊.

Male pseudohermaphroditism due to 17β-hydroxysteroid dehydrogenase 3 deficiency

Objective To investigate the clinical and genetic characteristics in a patient with 17β-hydroxy-steroid dehydrogenase (17β-HSD) 3 deficiency, regarding its pathophysiology and pathogenesis. Methods Clinical features and laboratory data were analyzed in a pedigree of 17β-HSD3 deficiency. Blood samples from the patient and his parents were collected. HSD17B3 gene was screened for mutations by PCR and subclone sequencing. Results The patient presented with pubertal virilization and gynecomastia. The physical examination showed female external genitalia and testes in inguinal canals. The chromosome karyotype was 46, XY. Serum FSH, LH, dehydroepiandrosterone sulfate, androstenedione and 17-OH-progesterone levels were raised, whereas plasma testosterone was lowered. Sequencing analysis revealed 4 nucleotide deletion (172-175del) of HSD17B3 gene. Conclusion Virilization and gynecomastia in puberty suggest the probability of 17β-HSD deficiency. It may be verified clinically by hCG-stimulating test and confirmed by gene diagnosis.