Abantu abanezinwele ezibomvu bangaphila isikhathi eside uma befunda iqiniso ngamagciwane abo ...
Isintu sinomqondo wokuthi ubusha obungunaphakade, kodwa kuze kube manje akukaze kwenzeke ngisho nokuthola incazelo yokuthi kungani umuntu ngamunye ehlukile futhi efana nonyaka. Ngokuvamile, ukubukeka kwentsha kanye nempilo enhle eminyakeni engu-50-60 kuchazwa ukulala okuphezulu nokupheka okunempilo, kodwa lokhu akulona iqiniso. Kunezibonelo eziningi ukuthi abantu abanemikhuba eyingozi kanye nesimiso sokusebenza esinzima baba yisikhathi eside. Ngakho-ke iyini imfihlo yobusha ngaleso sikhathi? Ososayensi bathole impendulo yalo mbuzo: kungukuthi okuthiwa "geni" obomvu.
Iyini isakhi "esibomvu"?
Intuthuko ekuqondeni ukuthi kungani abanye abantu bekwazi ukubheka yonke indlela ngisho nasebudala, ososayensi baye bazuza ngokutadisha i-DNA yabantu. Esikhathini sokuziphatha komuntu ngamunye, isakhi segciwane le-MC1R sinqunywe, okuphethwe ukuvikela umzimba emisebeni ye-ultraviolet. Lona yimisebe eyenza ukuguga kwesikhumba: ukubonakala kwamagwinya, ukuma kanye namabala okushisa. I-MC1R inciphisa umonakalo wayo ku-epidermis, ngakho-ke izinguquko zesikhumba zangaphandle zivela kubantu eduze kwe-50, hhayi eminyakeni engu-10. Ukutholakala okumangalisayo kwalesi sifo kungokwesayensi eNyuvesi yase-Erasmus eNetherlands.
Njengengxenye yokutadisha kwabo, odokotela bathatha izivivinyo ze-DNA kubantu abangu-2 693 futhi baphinde bahlola ukuhlolwa kwesikhumba sabo ukuze bathole ukuthi babheka kuncane yini kuneminyaka yabo yangempela. Esikhathini sezinhlayiyana zalabo abanesikhumba sabo abangafuni ukulalela imithetho yokuguga kwemvelo, futhi i-MC1R itholwe. Isakhi sofuzo esifanayo sibangela umbala obomvu obomvu - yingakho wawubizwa ngokuthi "ifulegi" elibomvu.
Intsha ixhomeke kanjani ekubukeni kombala?
Ingabe lokhu kusho ukuthi abantu abomvu abanezinwele ezibomvu bahlale babheka kangcono kunezontanga zabo? Ngokuqinisekile, yebo. Isimo sesikhumba sabo okungenani iminyaka emibili "ama-lags" ekugugeni kusuka emakhanda amnyama nezinwele. Lapho sekuvela, abamele iNyuvesi banquma ukuqhubeka nokucwaninga ukuthola ukuthi kuzoba yini ukuguga kwabantu abanezinye izinwele zesikhumba nesikhumba ngaphandle kwama-freckles.
UProfesa Ian Jackson wakwazi ukufakazela ngokwesayensi ukuthi abantu abanezinwele ezibomvu kanye nombala oboya bezinwele bazobukeka kangcono ekugugeni kunama-brunette abomvu. Kufanele futhi abe namabala aluhlaza okwesibhakabhaka, ama-gray noma aluhlaza ukuze afane ngokugcwele nombala "obala". Lezi zosayensi zofuzo zosayensi zibizwa ngokuthi "ukuhlolwa kweminyaka ebonakalayo."
U-Ian uthi:
"Isinyathelo esilandelayo ukudala okuthile okuzokwenza kusebenze lesi sakhi zofuzo kubo bonke abantu, kodwa okwamanje ulwazi olunjalo alutholakali kithi."
Abacwaningi abakwazi ngempela ukuqonda isimiso sesenzo segciwane le-MC1R futhi "bahlukanise" kulolu hlobo lwezakhi zofuzo ezifanayo. Kodwa bayaqiniseka ukuthi maduzane bazokwazi ukudala isidakamizwa, emva kwalokho wonke umuntu uzobukeka encane futhi enhle.