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Hayvanların da İnsanlar Benzer biçimde Kan Grupları Var mı? - HAKANSEYHAN
Bildiğiniz suretiyle çoğumuz bir kan grubuna sahibiz. Bu kan grupları; A, B, AB yada 0 tanımlı, kısaca insanlara özgü olan kan gruplarıdır. Peki şimdi size hayvanların da insanoğlu şeklinde çeşitli kan gruplarına haiz bulunduğunu söylesek, şaşırır mısınız?
Her insanoğlunun kan grubu değişik bu sebeple kanı oluşturan antijen ve antikor isminde olan birbirinden değişik yapıdaki protein moleküllerinin çeşitli kombinasyonları var.
Örneğin antijenler, kırmızı kan hücrelerinin yüzeyinde bulunur; antikorlar ise kan plazmasında görülür. Hayvanlarda da kan grupları benzer şekilde oluşuyor sadece her birinin kan grubu aynı değil. Ne şekilde mi? Gelin, görelim.
Hayvanların da kan türlerini kırmızı kan hücrelerinde bulunan antijenler belirliyor fakat…
WIRED
Hayvanlar başka canlılardan kan alıp veremez. Bunun sebebi; antijenin, vücuda girdiğinde antikor oluşmasına neden olan bir virüs, parazit, bakteri şeklinde protein yapısına haiz bir madde olmasıdır. Hayvanlar değişik türlerden kan aldığında fazlaca ölümcül neticelerle karşılaşabilir. Doğal ki insanlarda da durum benzerdir. Bir insana bir tek kan grubu uyumlu başka bir insandan kan nakli yapılabilir.
Hayvanların kan grubu sistemine baktığımızda…
Yukarıda da belirtildiği şeklinde hayvanların kanlarındaki antijenler birbirinden değişik olduğundan her hayvan türünün kan grubu sistemi birbirinden değişiktir. Örneğin köpeklere baktığımızda; bir köpeğin kan grubuna DEA (Köpek eritrosit antijeni) deniyorken, başka bir köpeğin kan grubu numarasının değişik olabildiğini görürüz. Bu, köpeklerin kendi içlerinde dahi fazlaca değişik kan tipleri bulunduğunu gösteriyor. Mesela köpeklerin 1.1, 1.2, 3, 4, 5, 6, 7 ve 8 olmak suretiyle 8 çeşit kan grubu vardır.
Antijenlerin temsili resmi
Kedilerin kan grubu sistemi köpeklere bakılırsa daha kolay. Şu sebeple kedilerde A, B ve AB olmak suretiyle bir tek 3 tane kan grubu bulunuyor.
Doğal buradan kan yapılarının insanlara benzediği sonucu çıkmasın bu sebeple bu bir tek isim benzerliği. Örneğin atların 8, koyunların 7, sığırların 11, domuzların 16, keçilerin de 5 tane kan grubu mevcut.
Maymunların insanlarla benzer kan grupları olduğu düşünülüyor.
Bu iddia küçük bir maymun grubu üstünde meydana getirilen deneylerden elde edilmiş verilere dayanıyor. Uzmanlar, maymunların insanlardaki A, B ve 0 kan grubu sistemiyle aynı olmasa da benzer kan türlerine haiz bulunduğunu söylüyor. Akademisyenler, insanlara meydana getirilen kan transfüzyonunun (kan nakli) başarıya ulaşmış olabilmesi için insanların kan gruplarına benzer özellikleri taşıyan başka bir kan grubu olması icap ettiğini ifade ediyor. Bu bakımdan uygun bir eşleştirme olduğu takdirde maymunlar ve insanoğlu şeklinde memeli türler içinde kuramsal olarak kan nakli yapılabileceği düşünülüyor.
Grid News
Fakat gene de bu türler arasındaki A-B-0 kan grupları içinde transfüzyonun başarısını negatif yönde etkileyebilecek fazlaca fazla fark bulunduğunu da unutmamak gerek. Akademisyenler bu farkların, insan atalarının ve maymun türlerinin üreme mevzusunda birbirlerinden uzaklaşarak evrimleşmesine bağlıyor. Şu sebeple uzmanlar bu nedenden dolayı, kırmızı kan hücrelerinin yüzeyindeki molekülleri belirleyen genlerin mutasyona uğrayıp farklılaşmaya başladığını söylüyor. Böylece kan yapıları da birbirinden farklılaştı diye düşünüyorlar.
Kaynaklar: Science Focus, BYJU’S, Majalahinggris, ABC
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