资源描述：
《(医学遗传学)11人类染色体畸变》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、末代沙皇尼古拉二世的公主斯塔西娅安娜-安德森1956电影”真假公主”10人类染色体畸变chromosomeaberrationAnytypeofchangeinthechromosomestructureornumber(deficiencies,duplications,translocations,inversions,etc.).Althoughitcanbeamechanismforenhancinggeneticdiversity,suchalterationsareusuallyfatalorill-adaptive,especiallyinanimals.1.factorsind
2、ucingchromosomeaberrationA.IonizingradiationIonizingradiationproducesrearrangementsofthegenome.WhenirradiationoccursduringtheG0/G1phaseofthecellcycle,large-scalerearrangementsappearasexchange-typechromosomeaberrationsatthenextmitosis.Suchaberrationscanaltercellularphenotypes,andareimportantinvarious
3、areasofbiology:Analyzingchromosomeaberrationshelpscharacterizerepair/misrepairpathwaysinvolvedintheprocessingofDNAdamage.Ionizingradiationhassomeuniquefeaturesasaprobeofsuchpathways.Comparedtoothergenotoxicagents,itproducescopiousquantitiesofDNAdoublestrandbreaks(DSBs),anditstimingcanbecontrolledmor
4、eaccurately.Moreover,initialradiationdamagehasadiscrete,stochasticcharacterthatcanbemodulatedbyusingdifferentkindsofradiation(e.g.a-particlesversusx-rays)havingdifferentionizationdensities.Thespectrumofdifferentradiation-inducedchromosomeaberrationsisinformativeaboutthegeometryofchromosomesduringint
5、erphase,andviceversa.B.chemicalmutagenAkindofsubstances,suchasdrugsortoxins,thatcauseschromosomalaberrationsoflivingorganisms,orincreasetherateofmutation.Drugantitumordrug（抗肿瘤药物）环磷酰胺、氮芥、白硝安（马利兰）、甲氨喋呤、阿糖胞苷等抗癌药物Tocolysis（子宫收缩抑制剂）drugwhichpreventpregnancyreaction(预防妊娠反应的药物)anti-epileptic苯妥英钠可引起人淋巴细胞多倍体
6、细胞数增高agriculturalchemicalsSomeagriculturalchemicalscaninducechromosomeaberration,likephosphatepesticide.Industrialpoisons苯、甲苯、铝、砷、二硫化碳、氯丁二稀、氯乙烯单体FoodadditivePreservative(防腐剂),pigment(色素),AF-2(硝基呋喃基糖酰胺),benzosulfimide(环己基糖精)。Cbiologicalmutagentoxoidsterigmatocystin(杂色曲霉素),Flavacin(黄曲霉素),clavacin(棒曲霉素
7、)等virusGermanmeaslesvirus(风疹病毒),(hepatovirus)乙肝病毒,Measlesvirus(麻疹病毒),cytomegalovirus(巨细胞病毒)DMaternalageDown综合征与母亲年龄2.chromosomalaberrationsA.chromosomenumericalaberrationNumericalaberrationisachangein
