There's plenty to trim from nature too: the lungfish has a huge amount of unnecessary DNA

In these challenging economic times, when belt-tightening seems to be the order of the day, Helsingin Sanomat often turns to nature for perspective. This week, our focus is on the lungfish, a creature that, despite its modest size, carries an astonishing biological burden: the longest genome of any animal on Earth. It's a fascinating, albeit somewhat perplexing, example of evolutionary excess.

While we humans navigate our lives with a genome of roughly three billion base pairs, the lungfish boasts a staggering 91 billion. Yet, here's the kicker: only a tiny fraction, about one percent, of this immense genetic library is actually in use. The vast majority appears to be what scientists term 'junk DNA' – repetitive sequences and remnants of past genetic activity. It’s as if nature, in its infinite wisdom, decided to give the lungfish a library filled with countless redundant copies and outdated texts, while only a few key volumes are essential for its survival.

This discovery raises intriguing questions about efficiency and evolution. All terrestrial animals, including us, trace their ancestry back to ancient fish-like creatures. The lungfish, however, seems to have taken a rather inefficient evolutionary path, accumulating an enormous amount of DNA without a proportional increase in functional genes. It makes one wonder if this biological 'copy machine' that seems to be perpetually running could have been better utilized. Still, for the lungfish itself, this seemingly excessive DNA doesn't appear to hinder its survival in the rivers of South America or its remarkable ability to hibernate in mud for years during dry seasons. It’s a reminder that nature’s designs are not always as streamlined as we might expect.