Niyə bəzi tünd rəngli saçlı kişilərin narıncı/qırmızı saqqalı var?

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18 – 60 yaş arasındakı kişilər, son  illərdə saqqal uzatmaq modasına qapılıblar. Bir çox kişinin bu “tüklü” modaya qapılmasından sonra bəlkə də özünüzə sual vermiş ola bilərsiniz, “Niyə bir çox adamın saqqalı narıncı / qırmızıdır amma saçları tünddü? Ailələrində belə narıncı / qırmızı saç olmadığına baxmayaraq niyə bu belədir?”. Bunun cavabı genlərimizdədir.  Erfocentrumdan (Hollandiyalı genetik işləri dəstəkləmə təşkilatı) Petra Haak-Bloem bunun MC1R-geni səbəbiylə meydana gəldiyini deyir. Həmçinin “Tük rəngini təyin edən gen kodlaşdırılması,” tam olaraq dominant olmayan irsi xüsusiyyətlər “olaraq tanıdılır, mənası isə tük rəngi yalnız sadə bir şəkildə bütün ətlərin rənginin eyni olması şəklində kodlanmır. Bu genlər, bədənin fərqli bölgələrində (saç, saqqal, qaş, genital bölgə) fərqli şəkillərdə özünü göstərirlər”deyir.

 

Haak-Bloem bunun, kodlaşdırmanı  edən genlərin müəyyən sayda fərqli piqmentlərlə (melanin) nə edəcəyinə bağlı olduğunu, tük rənginin iki piqmentə bağlı olduğunu və bunların qara piqment (eumelanin) və yəni qırmızı piqment (pheomelanin ) olduğunu deyir. Bundan başqa, “10 ildən əvvəlki zamanda, araşdırmacılar 16-cı xromosomda insanların narıncı / qırmızı ət rəngini qazanmasında böyük əhəmiyyəti olan gen (MC1R) kəşf etmişdilər. MC1R’nin vəzifəsi melanocortin 1 adı verilən zülalı istehsal edir. Bu zülal isə qırmızı piqmentin qara piqmentə çevirməsində rol oynayır. ”
“Bir adam valideynlərindən MC1R geninin iki fərqli mutasiyaya uğramış versiyasını  miras aldığı zaman, daha az pheomelanin, eumelaninə çevrilir. Bu pheomelaninlər piqment hüceyrələrində yığılır və adam açıq rəngi və qırmızı / narıncı tüklərə sahib olur.”deyə izah edir.

 

Haak-Bloem həmçinin bu mutasiyaya uğramış genlər əgər yalnız bir valideynlərdən gəlirsə narıncı / qırmızı ət çox az-az görünəcək, çünki bu xüsusiyyətin ortaya çıxmasının səbəbi bu genin növlərinin özünü göstərməsidir deyə əlavə edir.

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