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by Mymy · 05.07.2022

In most placental mammals, including humans, the testes descend into the lower abdomen or scrotum during development, which is an important evolutionary process that helps keep them cool and achieve optimal function. Elephant testes, however, do not drop, remaining high in the abdomen. Now, some German scientists have probed to the molecular level to understand the reason for the anomaly.

Aiming to resolve this debate, the new research, led by by Virag Sharma and Michael Hiller, of the Max Planck Institute of Molecular Cell Biology and Genetics, in Dresden, Germany, used genomic data from 71 mammal species to analyse the evolution of two key genes, RXFP2 and INSL3. The genes induce the development of the gubernaculum, the ligament that is crucial for testicular descent.

According to the new research, both the RXFP2 and INSL3 genes are lost or are nonfunctional in four afrotherians that completely lack testicular descent – the tenrec, cape elephant shrew, cape golden mole, and manatee.

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