Hereditary spastic paraplegias (HSPs), characterized by progressive and bilateral spasticity of the legs, are usually caused by developmental failure or degeneration of motor axons in the corticospinal tract.

We reevaluated a previously reported family with an X-linked mental retardation syndrome and attempted to identify the underlying genetic defect.

Qiao J1, Wang ZB2, Feng HL3, Miao YL4, Wang Q5, Yu Y1, Wei YC2, Yan J1, Wang WH6, Shen W7, Sun SC8, Schatten H9, Sun QY10. Author information 1Center of Reproductive Medicine, Department of Obstetrics and Gynecology, Peking University Third

Meiotic recombination creates genetic diversity and ensures segregation of homologous chromosomes.

Single-cell genome analyses of human oocytes are important for meiosis research and preimplantation genomic screening.

医学硕士，妇产科主任医师，教授，博士生导师。现任广州市妇女儿童医疗中心副院长，优生围产研究所所长，卫生部产前诊断专家。99年获国务院政府特殊津贴；2005年获“第二届中国医师奖”；2011年获“广州市杰出专家”；2012年成为国家自然科学基金及科技成果奖评审专家。

男，1959年6月生，博士。“中国青年科技奖”获得者，1993年起享受政府特殊津贴。现任第四军医大学附属西京医院全军临床检验医学研究所所长、检验科主任，教授，主任医师，博士生导师。

原国家卫计委妇幼健康服务司司长， 中国妇幼健康研究会常务副理事长。