New research reveals that Ötzi the iceman was bald and probably from a farming family – what else can DNA uncover?
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木曜日, 8月 24, 2023
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This amazing find would subsequently become known as Ötzi the Iceman.
Key Points:
- This amazing find would subsequently become known as Ötzi the Iceman.
- His body and belongings were extensively studied, prompting numerous questions: what was he doing here?
- His unique preservation enabled the sequencing of Ötzi’s whole genome – the complete “instruction booklet” for building a human.
- But it was enough for a team led by Turi King at the University of Leicester to extract fragments of DNA from them.
Crime scene samples
- Sequencing a genome, which comprises billions of DNA bases, enables scientists to evaluate regions of the human genome that contribute to appearance.
- For more than 30 years, forensic scientists have looked at specific highly variable regions in DNA to match these to crime scene samples, or to relatives of a suspect or victim.
- So how likely is it that DNA from such a sample could accurately paint a picture of me?
- Can forensic scientists build a kind of identikit photo from a crime scene DNA sample?
- Hair colour can be predicted from DNA, but darker shades of hair are more accurately predicted than blonde hair.
Environmental factors
- Commercially sold laboratory kits such as Hirisplex can simultaneously evaluate several DNA regions to predict the hair and eye colour from a biological sample.
- However, unlike eye colour, hair colour prediction from DNA is only of value until midlife, when the natural processes of ageing lead to greying or white hair.
- These processes also lead to hair loss in some people and more than 300 gene variants have been linked to baldness.
- More representative data from the rest of the world will therefore enhance studies in forensic archaeology, such as the Ötzi research.