wp-02: English Biology Paragraph (Deep-Sea Isopod HGT)

Task Info

• Module: writing
• Discipline: Biology
• Depth: L2
• Verdict: PASS

Source Paper

Yuan et al., Cell 189, 1-16 (2026)

Input (Weak English)

Deep sea animals have a hard time finding food. The giant isopod is a very big deep sea creature that can go without eating for a really long time. The authors looked at its genes and found something interesting. They think the isopod got a gene from bacteria a long time ago, and this gene helps it survive when there is no food. The gene is called ND1 and it has something to do with how the animal uses energy. When they put this gene into zebrafish, the fish could survive 37% longer without food. This is an important discovery about how animals can adapt to extreme environments.

Output (Polished English)

The deep sea is among the most nutrient-limited ecosystems on Earth, imposing extreme selective pressure on its inhabitants. The deep-sea supergiant isopod Bathynomus jamesi, which reaches over 50 cm in body length, can survive months to years of starvation - a capacity that has long puzzled evolutionary biologists. Yuan and colleagues sequenced the genome of B. jamesi and identified a bacterial-derived NADH dehydrogenase subunit 1 (ND1) gene acquired through an ancient horizontal gene transfer event. Following acquisition, ND1 underwent massive duplication and transcriptional upregulation, enabling the isopod to reprogram its energy allocation under nutrient deprivation. Functional validation in zebrafish demonstrated that heterologous expression of ND1 extended starvation survival by 37% under low-metabolism conditions. These findings reveal a previously unappreciated mechanism by which deep-sea megafauna co-opt microbial metabolic genes to resolve the energetic trade-off between gigantism and starvation resilience.

Verdict

PASS - All colloquial expressions replaced with domain-precise terminology. Species name (Bathynomus jamesi) and mechanism (HGT, ND1 duplication) correctly added.