Health encyclopaedia - Alphabetical Topic List健康百科全书-按字母顺序排列的主题清单
| | A | | 1 | | | B | | b | | | C | | 人才招聘 | | | D | | | | | E | | 电子 | | | F | | f | | | G | | 克 | | | H | | h | | | I | | 我 | | | J | | j | | | K | | k | | | L | | 升 | | | M | | 米 | |
| | N | | n | | | O | | o | | | P | | p | | | Q | |常见问题 | | | R | | 研究 | | | S | | | | | T | | 吨 | | | U | | u | | | V | | v | | | W | | 瓦特 | | | X | | x | | | Y | | y | |
Causes of Marfan syndrome的原因，马凡氏综合征
Marfan syndrome is caused by a defective gene in one of the 46 chromosomes carrying DNA. This gene controls the production of fibrillin, a substance essential to the creation of connective tissue in the body.马凡氏综合征是造成损坏的基因在其中的46条染色体的DNA进行。这种基因控制的生产fibrillin ，一种物质，必须创造结缔组织在人体中。
75% of cases are inherited, with the remaining 25% occurring as a spontaneous genetic mutation (with neither parent affected). 75 ％的案件是继承，其余25 ％的发生，作为一个自发的基因突变（与家长既不影响） 。
