Rare Brain Gene Retains Ancient Ability to Move Within Genome

Researchers at Cornell University identified a human gene called BC200 that plays a functional role in brain cells while maintaining the capacity to relocate itself within the genome, a combination previously unknown in human genes. The gene evolved from a transposon millions of years ago but unlike most genes with this origin, never lost its mobility. The discovery was made after scientists found BC200 embedded in a poxvirus, suggesting it may have moved from infected skin cells into the pathogen.

Transposons comprise a substantial portion of human genetic material, yet most have become inactive over millions of years of evolution. BC200 represents an unusual case where a gene derived from these mobile elements has maintained both its jumping capacity and a functional role in neural tissue. The discovery of BC200 sequences within a poxvirus indicates horizontal gene transfer may occur between human cells and pathogens, a phenomenon rarely documented in humans despite being observed in other organisms like insects.

The exact mechanisms by which BC200 supports brain function remain incompletely understood, though researchers hypothesize involvement in regulating protein synthesis from messenger RNA. Its presence in reproductive cells suggests newly transposed copies could potentially be inherited, creating possibilities for genetic variation across generations while also raising questions about long-term evolutionary and health implications.