Researchers have discovered that DNA preserves far longer in hot African climates than previously believed, upending assumptions about genetic material degradation in warm conditions. Scientists extracted DNA from animal remains excavated in South Africa dating back to the last ice age, finding that genetic sequences remained intact for up to 50,000 years despite high temperatures.
The findings challenge the conventional wisdom that warm environments rapidly destroy DNA. Earlier models suggested genetic material degrades substantially within a few thousand years in tropical and subtropical regions. The South African samples demonstrate this process works far more slowly than anticipated, potentially opening new avenues for ancient DNA research across Africa.
The research team recovered DNA from extinct megafauna and other animals preserved in South African caves and deposits. By analyzing how well genetic sequences survived across different timescales, they established that African samples retained readable DNA sequences spanning tens of thousands of years. This extended preservation window offers paleontologists and geneticists access to biological information from African fauna previously thought lost to time and heat.
The discovery carries methodological importance for evolutionary biology. Africa harbors exceptional fossil records spanning millions of years, yet genetic studies of ancient African fauna have lagged behind research on remains from colder northern regions like Siberia and Canada. Better preservation than expected means scientists can now attempt DNA extraction from older African specimens with improved success prospects.
Understanding DNA longevity in different climates also informs conservation strategies for modern genetic repositories. The research suggests temperature management protocols for specimen storage may vary by region and that tropical institutions can maintain genetic archives longer than previously calculated.
However, limitations exist. The specific environmental conditions in South African caves—including stable temperatures, low humidity, and protective geology—may not represent all African contexts. DNA survival depends on multiple factors beyond heat, including microbial activity, chemical degradation, and moisture levels. Results from cave sites may not predict preservation in open archaeological contexts across Africa.
The team published findings showing that targeted