蜜蜂的基因密码被揭开

 

Scientists from the UK and Australia think their findings could help show links between nutrition, environment and the insects' development.

 

It could, they suggest, offer an insight into problems like Colony Collapse² Disorder³, a mysterious cause of mass bee deaths globally.

 

The findings appear in Insect Biochemistry and Molecular⁴ Biology. 

 

"Honey bees live in complex societies comprising tens of thousands of individuals," explained study co-author Paul Hurd from Queen Mary, University of London.

 

"Most of these are female 'worker' honeybees that are unable to reproduce and instead devote their short lives to finding food in flowers... and other tasks such as nursing larvae⁵ inside the hive." 

 

But the hive has a queen as well - the much longer-lived, reproductive head of the hive, 

 

"When the queen bee lays her eggs, worker bees can determine whether the resulting larvae are to become an adult worker bee or an adult queen bee," Dr Hurd said. 

 

"The type of food the larvae is fed dictates⁶ the developmental outcome - larvae destined⁷ to become workers are fed a pollen⁸（花粉） and nectar（花蜜） diet, and those destined to become queens are fed royal jelly. 

 

"This difference in feeding is maintained over the entire lifetime of the worker or queen bee."

 

The change is suggested to be the result of a "histone code" - a process that sees genetic changes made to proteins called histones（组蛋白） within cells' nuclei⁹. Rather than "genetic" changes that are locked into DNA¹⁰, these are known as "epigenetic" changes.

 

The report marks the first time such effects had been recorded in honey bees.

 

"The development of different bees from the same DNA in the larvae is one of the clearest examples of epigenetics（实验胚胎学） in action - mechanisms¹¹ that go beyond the basic DNA sequence," said co-author Mark Dickman from the University of Sheffield.

 

"From our knowledge of how the histone code works with in other organisms, we think the marks on the histone proteins might act as one of the switches that control how the larvae develop."

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