Te DNA me ngā Ira: Te Pūtake o te Ora
I te ao koiora, kāore pea he wāhanga e tino taketake ake ana, e tino hira ake ana i te DNA me ngā ira. He kī ēnei e rua hei whakatuwhera i tō tātou māramatanga ki te tipu, te mahi, me te whanaketanga o ngā rauropi ora. Heoi, kia mārama ai tātou ki a rātou, me ruku hohonu ake tātou ki ia wāhanga me ngā taunekeneke i waenganui i a rātou.
He aha te DNA?
Ko te DNA, te waikawa deoxyribonucleic rānei, he ngota e penapena ana i ngā tohutohu ira e hiahiatia ana mō te whanaketanga, te tipu, te mahi, me te whakaputa uri o ngā mea ora katoa me te maha o ngā huaketo. Ko tōna hanganga he porowhita takirua e rite ana ki te arawhata piko, ko ngā 'pikinga' he mea hanga mai i ngā takirua o ngā turanga hauota: adenine (A) me te thymine (T) me te cytosine (C) me te guanine (G).
Kei roto i ngā irahiko ngā irahiko DNA, e kitea ana i roto i te karihi pūtau. Hei tauira, i roto i ngā pūtau tangata, e 23 ngā takirua irahiko, kei roto i ia takirua he mano tini ira. Kei roto i te DNA ngā mōhiohio ira katoa, e tukuna iho ana mai i tētahi whakatipuranga ki tētahi whakatipuranga.
Te Tūranga o ngā Ira i roto i te DNA
Ko te ira he wāhanga motuhake o te DNA e waehere ana mō tētahi pūmua motuhake. He raupapa turanga motuhake tō ia ira e kawenga ana mō te whakahaere i te hanga o tētahi pūmua rerekē, ā, koia nei te whakatau i ngā āhuatanga me ngā mahi a tētahi rauropi.
E 20.000 ki te 25.000 pea ngā ira o ia tangata. Ehara i te mea ko te "puka tohutohu" anake te mahi a ēnei ira. Ko ngā ira te kaiwhakahaere i ngā mea katoa mai i te tae o te makawe me ngā kanohi ki te mate me te ngāwari ki ngā āhuatanga taiao.
Te Tukanga Whakapuakitanga Ira
Ko te whakaaturanga ira te tukanga e whakamahia ai ngā mōhiohio mai i ngā ira hei hanga i ngā hua mahi pēnei i ngā pūmua. E rua ngā taahiraa matua o tēnei tukanga: te tuhi me te whakamāori.
1. Te Tuhituhi: I te wā o te tuhituhi, ka tuhia he wāhanga o te DNA e tohu ana i tētahi ira ki roto i te RNA karere (mRNA). Mā te whākōkī RNA polymerase ka āwhina i te herea o ngā takirua turanga e tika ana, ka huri i te raupapa DNA ki tētahi raupapa RNA.
2. Whakamāoritanga: Kātahi ka whakamāoritia te mRNA ki te pūmua i roto i te ribosome. I te wā whakamāoritanga, ka whakamāoritia te raupapatanga turanga i roto i te mRNA ki te raupapatanga waikawa amino e hanga ana i te pūmua. Ka tutuki tēnei mā te āwhina o ngā ngota RNA whakawhiti (tRNA), e tāpiri ana i ngā waikawa amino motuhake e ai ki te raupapatanga codon i roto i te mRNA.
Te Whakahaere Ira
Kāore e whakaatuhia ana ngā ira katoa i te wā kotahi, i te kaha kotahi rānei. Ko te whakahaere ira te tukanga e āhei ai ngā pūtau ki te urupare ki ngā tohu o waho, o roto rānei mā te whakarerekē i te whakaaturanga o ngā ira motuhake.
Ka taea e tēnei tukanga whakahaere te puta i ngā wāhanga rerekē, mai i te whakahaere i te whakawhiti ira me te pumau o te mRNA ki te whakahaere i muri i te whakawhiti ira. Mā te pūnaha whakahaere ira e mahi pai ana ka taea e ngā pūtau te tipu me te mahi pai i roto i te taiao hurihuri.
Ngā Huringa Ira DNA me ō rātou Pānga
Ko ngā whakarerekētanga ira he huringa e puta ana i roto i te raupapa turanga o te DNA. Ka taea e ēnei whakarerekētanga te pā ki ngā momo pānga, mai i te koretake ki te kino ki te whai hua. Ka taea e ētahi whakarerekētanga kino te whakaputa i ngā mate ira, pērā i te cystic fibrosis, te anemia pūtau mariao rānei. I tētahi atu taha, he pūtake nui anō hoki ngā whakarerekētanga ira hei akiaki i te whanaketanga.
Ka puta ngā whakarerekētanga ira ira i te maha o ngā āhuatanga, tae atu ki te irahiko, ngā matū, ngā mate huaketo, tae atu ki ngā hapa tāruarua DNA tūpono. He tikanga whakatika DNA ā ngā rauropi e angitu ana ki te whakatika i ēnei whakarerekētanga ira, ahakoa kāore i te whai hua i ngā wā katoa.
Te Hangarau DNA me te Ira
Nā ngā whanaketanga o te hangarau ira kua taea te whakarerekē me te whakahaere i te DNA me ngā ira i ngā huarahi kāore i taea i mua. Hei tauira, mā te hangarau ira ka taea e ngā kaipūtaiao te whakauru, te muku, te whakakapi rānei i ngā raupapa DNA i roto i ngā ira kia tutuki ai ngā hua e hiahiatia ana. Kei te whakamahia kētia ngā rauropi ira kua hangaia i roto i ngā mara maha, mai i te ahuwhenua ki te rongoā.
Mā ngā tikanga whakatika ira hou, pērā i te CRISPR-Cas9, ka taea e tātou te whakatika i te ira tangata me te whai hua ake. He tino whai hua tēnei hangarau mō te rongoā i ngā mate ira maha, tae atu ki te whakatika i ngā ira kua pakaru i roto i ngā pūtau tangata.
Ngā Tikanga Matatika me te Anamata o ngā Ira Tangata
I te taha o te kaha whakamiharo ki te whakahaere i te DNA me ngā ira ka puta mai ngā pātai matatika nui. Ko te kaha ki te whakarerekē i ngā ira tangata ka whakatuwhera i ngā kōrero mō te whakarei ake i te ira, te hangarau ira o ngā kukune, me ō rātou pānga ki te hapori.
Ahakoa he maha ngā painga pea o tēnei hangarau, pērā i te whakaiti i te horapa o ngā mate ira me te whakapai ake i te kounga o te oranga, me āta whakaaro anō hoki tātou ki ngā pānga me ngā mōrearea mō te wā roa e pā ana ki te hangarau ira.
Nō reira, kāore e taea te whakaiti i te tūranga o te DNA me ngā ira i roto i te ora. Hei wāhanga taketake o te ira tuku iho me te ora, ehara i te mea ko rātou anake te pūtake o te hanganga ā-tinana o ngā mea ora engari he awe anō hoki ki te kounga o te ora me te oranga o ia tangata. Mā te rangahau tonu me te auahatanga, ka ruku hohonu tonu mātou ki ngā mea ngaro o ēnei huānga iti e rua, me te tumanako ka whakatuwhera i ngā pae tawhiti hou i roto i tō mātou māramatanga ki te ora me te ao whānui.
