Li-chromosome: Libopeho tsa Bohlokoa Liphatseng tsa Lefutso
Li-chromosome ke meaho e teteaneng e fumanoang ka har'a khubu ea lisele tsa eukaryotic tse nang le tlhahisoleseling ea liphatsa tsa lefutso ka sebopeho sa DNA. Sebōpuoa se seng le se seng se phelang se nang le khubu (eukaryotic) se na le li-chromosome, ho kenyeletsoa batho, liphoofolo, limela le li-fungus. Sehloohong sena, re tla hlahloba likarolo tse fapaneng tsa li-chromosome, ho kenyeletsoa sebopeho sa tsona, mosebetsi le bohlokoa ba tsona baelojing ea batho le bophelo bo botle.
Sebopeho sa Chromosome
Ka sebopeho, di-chromosome di ka hlaloswa e le dikhoele tse telele tse bopilweng ka DNA e phuthetsweng ho potoloha diprotheine tse bitswang di-histone. Ha mmoho, DNA le di-histone di bopa motsoako o tsejwang e le chromatin. Tlas'a maemo a itseng, jwalo ka nakong ya karohano ya sele, chromatin ena e a hola mme e bopa di-chromosome tse teteaneng tse bonahalang tlasa microscope.
Chromosome ka 'ngoe e na le matsoho a mabeli a hokahaneng bohareng ke centromere. Lipheletso tsa li-chromosome li sirelelitsoe ke meaho e bitsoang li-telomere. Li-telomere li sebetsa ho thibela tšenyo kapa ho kopana le li-chromosome tse ling. Nakong ea karohano ea sele, li-telomere li bapala karolo ea bohlokoa ho bolokeng botšepehi ba tlhahisoleseling ea liphatsa tsa lefutso.
Mosebetsi oa Li-chromosome
Mosebetsi o ka sehloohong oa li-chromosome ke ho boloka le ho fetisa tlhahisoleseling ea liphatsa tsa lefutso ho tloha molokong o mong ho ea ho o mong. Liphatsa tsa lefutso tse ka har'a li-chromosome li hlophisitsoe ka mokhoa o otlolohileng, 'me phatsa ea lefutso ka 'ngoe e na le litaelo tsa ho kopanya liprotheine tse hlokahalang bakeng sa ts'ebetso ea baeloji. Liprotheine tsena li bapala karolo mesebetsing e fapaneng ea sele 'me li khetholla litšobotsi tsa fisioloji le tsa sebopeho sa lintho tse phelang.
Ho batho, ho na le dipara tse 23 tsa di-chromosome, tse nang le sete e le nngwe e tswang ho mme mme e nngwe e tswa ho ntate, e leng se etsang kakaretso ya di-chromosome tse 46. Para ya di-chromosome ya bo-23 e etsa qeto ya bong ba motho, mme XX e fella ka mosadi mme XY e fella ka monna.
Li-chromosome le Karohano ea Lisele
Karolo ea li-chromosome e bohlokoa nakong ea karohano ea sele, ka bobeli mitosis le meiosis. Nakong ea mitosis, e atisang ho etsahala bakeng sa kholo kapa pholiso ea lisele, li-chromosome lia ikatisa le ho arohana ho netefatsa hore sele e 'ngoe le e 'ngoe ea morali e fumana kopi e nepahetseng ea tlhahisoleseling ea eona ea liphatsa tsa lefutso.
Ka lehlakoreng le leng, Meiosis ke mofuta oa karohano ea sele e hlahang liseleng tsa kokoana-hloko, e hlahisang li-gametes tse kang mahe le peō ea botona tse nang le halofo feela ea palo ea li-chromosome (haploid). Ts'ebetso ena e kenyelletsa ho kopana ha liphatsa tsa lefutso, e leng habohlokoa bakeng sa ho fapana ha liphatsa tsa lefutso ho bana.
Li-chromosome le Mafu a Batho
Ho se leka-lekane palong kapa sebopehong sa li-chromosome ho ka baka maemo a fapaneng a bongaka. E 'ngoe ea maemo a tsebahalang haholo a amanang le ho se tloaelehe ha li-chromosome ke Down syndrome, e bakoang ke boteng ba kopi e eketsehileng ea chromosome 21. Boemo bona bo fella ka litšobotsi tse itseng tsa 'mele le kholo ea kelello e liehang.
Mathata a mang a kenyeletsa Turner's syndrome, Klinefelter's syndrome, le mefuta e fapaneng ea mofetše, moo liphetoho tsa chromosome li ka hlahang ka mokhoa oa liphetoho tsa 'mele' me tsa fella ka kholo e sa laoleheng ea lisele.
Lipatlisiso le Ntšetso-pele Lithutong tsa Chromosome
Phuputso ea chromosome e entse menehelo e kholo masimong a baeloji le bongaka ba liphatsa tsa lefutso. Ka tsoelo-pele ea mekhoa e kang karyotyping, FISH (Fluorescence in Situ Hybridization), le genome sequencing, bo-rasaense ba ka lemoha habonolo lintho tse sa tloaelehang tsa chromosome le ho utloisisa litlamorao tsa tsona tsa baeloji.
Morero o moholo oa Human Genome o hlophisitse 'mapa oa liphatsa tsa lefutso tsohle tsa DNA ea motho, ho kenyeletsoa le kutloisiso e tebileng ea sebopeho le ts'ebetso ea chromosome. Sena se butse tsela bakeng sa nts'etsopele ea mekhoa ea phekolo e ikhethileng le e sebetsang haholoanyane, ho kenyeletsoa le oncology le mafu a liphatsa tsa lefutso.
Bokamoso ba Patlisiso ea Chromosome
Ka lebaka la tsoelo-pele theknolojing le mekhoa e mecha baelojing ea limolek'hule, bokamoso ba lipatlisiso tsa chromosome bo tšepisa haholo. Monyetla oa ho hlophisa liphatsa tsa lefutso ho sebelisoa theknoloji ea CRISPR-Cas9, mohlala, o fana ka tšepo ea ho sebetsana ka kotloloho le mathata a chromosome a bakang lefu.
Leha ho le jwalo, ka bokgoni bona bo boholo ho tla diphephetso tse fapaneng tsa boitshwaro. Ho laola tsamaiso ya dijini ya chromosome ho ka ba le ditlamorao tse sa lebellwang mme ka hona ho hloka tlhokomelo le taolo e hlokolosi ya boitshwaro. Ho bohlokwa ho leka-lekanya kgatelopele ya saense le mehopolo ya boitshwaro ho netefatsa tshebediso e nang le boikarabelo ya mahlale a lefutso.
Qetello
Li-chromosome ke likarolo tsa motheo tsa baeloji, li bapala karolo ea bohlokoa ho bolokeng le ho fetiseng tlhahisoleseling ea liphatsa tsa lefutso. Tsebo ea li-chromosome e butse mamati a mangata a ho utloisisa motheo oa baeloji oa bophelo le mafu. Ha theknoloji e ntse e tsoela pele, re ka lebella lintho tse ncha tse ka ntlafatsang bophelo bo botle ba batho le boiketlo ba bona. Leha ho le joalo, leeto lena le tlameha ho etsoa ka ho nahana ka boitšoaro le temoho ea tšusumetso ea lona sechabeng.
