A team of international scientists has discovered new clues on how the giraffe's long neck evolved over millions of years. The study, published in the journal _Nature Genetics_, analyzed the DNA of giraffes and other related species to identify the genes involved in neck elongation.
The researchers found that mutations in four genes were responsible for the long necks of giraffes. These genes were involved in the regulation of bone growth and development, and they played a role in the development of the vertebrae in the neck.
The findings provide new insights into the evolutionary history of the giraffe and how its unique physical characteristics have allowed it to adapt to its environment.
Key Findings
- The genetic basis of the giraffe's long neck evolution is revealed by analysis of whole-genome sequence data, comparative genomics, transcriptomics, gene editing, and phenotypic data.
-Four candidate genes critical for the elongation of the giraffe neck are identified: LRRK1, OXTR, PLCB4, and BMP10.
-Mutations disrupting the enzymatic domain of LRRK1, inactivating OXTR, deleting PLCB4, and truncating BMP10, lead to impaired neck elongation in mice (Bmp10 heterozygous mutants), zebrafish, and human cell lines.
Evolutionary Implications
- Mutations in LRRK1, OXTR, PLCB4, and BMP10 have probably been under strong positive selection over the giraffe lineage and shaped a remarkable vertebrate evolutionary trajectory characterized by an extraordinary elongation of the cervical vertebrae for efficient foliage browsing within open biomes during dry periods throughout giraffe evolutionary history.
