This clam keeps transposable elements silent for 500 years without ramping up defense machinery

Transposable elements (TEs) are genomic parasites that copy themselves throughout the genome. Left unchecked, they cause mutations, genome instability, and cell death. Humans fight them with piRNA pathways, DNA methylation, and histone modifications—but all of these defenses decline with age.

The ocean quahog lives 500+ years. Its genome must remain stable across centuries. Does it keep TEs suppressed through enhanced defense machinery like other long-lived species? Or does it use a different strategy entirely?

The data suggests the latter—and the mechanism may involve metabolic suppression rather than immune escalation.