Nick-based data storage in native nucleic acids
Nick-based methods, devices, and systems for nick-based data storage in a deoxyribonucleic acid (DNA) sequence are disclosed. Digital information is encoded in a register of at least one copy of a double-stranded DNA sequence having a plurality of nickable positions. The data is translated into a sequence of values from a nick alphabet that is subsequently mapped to the plurality of nickable positions, and the DNA sequence is nicked according to the mapped values. Because the digital information is encoded as a series of nicked and non-nicked positions of a double-stranded DNA sequence, the nucleotide sequence of the DNA can be non-synthetic, or “native” DNA.
1. A method for storing data, the method comprising:
providing a register comprising a double-stranded deoxyribonucleic acid (DNA) sequence, wherein the DNA sequence has a plurality of nickable positions;
translating the data into a sequence of values from a nick alphabet, wherein the nick alphabet comprises at least a first value and a second value, wherein the first value indicates not to nick the DNA sequence, wherein the second value indicates to nick the DNA sequence, and wherein the sequence of values includes at least one second value;
mapping the sequence of values to the plurality of nickable positions; and
nicking one strand of the DNA sequence at each nickable position having a mapped value that indicates to nick the DNA sequence in order to provide an encoded register.
2. A method according to claim 1 , wherein the second value indicates to nick a first strand of the DNA sequence.
3. A method according to claim 2 , wherein:
the nick alphabet further comprises a third value; and
the third value indicates to nick a second strand of the DNA sequence.
4. A method according to claim 1 , wherein each nickable position is individually associated with a nucleotide subsequence that is unique within the DNA sequence.
5. A method according to claim 4 , wherein each unique subsequence comprises at least 12 nucleotides, at least 14 nucleotides, or at least 16 nucleotides.
6. A method according to claim 4 , wherein 10% to 70%, or 20% to 60%, or 30% to 50% of each unique subsequence is guanine or cytosine.
7. A method according to claim 1 , wherein any pair of nickable positions are separated in the DNA sequence by at least 16 nucleotides, at least 20 nucleotides, or at least 24 nucleotides.
8. A method according to claim 1 , wherein the register comprising the DNA sequence comprises a plurality of DNA sequences, wherein each DNA sequence of the plurality is distinct, and wherein each DNA sequence has a plurality of respective nickable positions.
9. A method according to claim 1 , wherein nicking one strand of the DNA sequence comprises cleaving the strand with an RNA- or DNA-programmable endonuclease.
10. A method according to claim 9 , wherein the DNA-programmable endonuclease comprises a polypeptide having at least 50% sequence identity to the amino acid sequence set forth in SEQ ID NO:1.
11. A method according to claim 1 , wherein the DNA sequence has at least 80% sequence identity to a nucleotide sequence native to a plant cell, a mammalian cell, an insect cell, a fungal cell, or a bacterial cell.
12. A method according to claim 11 , wherein the DNA sequence has at least 80% sequence identity to a nucleotide sequence native to an Escherichia coli cell.
13. A method according to claim 1 , wherein the nicking one strand of the DNA sequence comprises the nicking of a first nickable position and a second nickable position in parallel.