In life, what might substitute for phosphorus, if only trace amounts of phosphorus is available in the environment?

What sort of xenobiochemistry would support information-carrying macromolecules like DNA if only trace amounts of phosphorus were present on an alien planet? Since the phosphoribosyl backbone of DNA would not be possible in such an environment, what might be a viable substitute?

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In life, what might substitute for phosphorus, if only trace amounts of phosphorus is available in the environment?

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