Gender-specific separation of sperm cells and embryos
First Claim
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1. A method for separating a population of sperm cells, the method comprising:
- a) contacting the population of sperm cells with a labeled oligonucleotide moiety capable of binding a gender-specific tandem repeat sequence on either the Y chromosome or the X chromosome in a portion of the population of sperm cells to provide a labeled fraction and an unlabeled fraction, wherein the gender-specific tandem repeat sequence contains a target sequence having consecutive purine sequences or consecutive homopyrimidine sequences, wherein the target sequence of the gender-specific tandem repeat sequence has about 12 to about 24 nucleotides, wherein the gender-specific tandem repeat sequence is repeated at least 50 times on the respective chromosome of the labeled fraction, wherein the labeled oligonucleotide moiety comprises a triplex forming oligonucleotide moiety that binds to the target sequence, and wherein the labeled oligonucleotides moiety comprises a CY3 dye linked to a 5′
-end of the triplex forming oligonucleotide with an ester bond;
b) detecting a signal that distinguishes the labeled fraction and the unlabeled fraction; and
c) separating the labeled fraction from the unlabeled fraction forming a separated labeled fraction and a separated unlabeled fraction, wherein at least about 40% of each of the separated labeled fraction and the separated unlabeled fractions contain viable sperm cells that can be used for in vivo or in vitro fertilization.
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Abstract
Disclosed are sperm cells or embryos comprising a labeled oligonucleotide bound to a gender-specific repeat sequence. Methods for separating sperm cells or embryos containing a labeled oligonucleotide from sperm cells not containing the labeled oligonucleotide produce gender-enriched sperm cell fractions. The separated fractions are useful in producing offspring of a predetermined sex.
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Citations
16 Claims
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1. A method for separating a population of sperm cells, the method comprising:
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a) contacting the population of sperm cells with a labeled oligonucleotide moiety capable of binding a gender-specific tandem repeat sequence on either the Y chromosome or the X chromosome in a portion of the population of sperm cells to provide a labeled fraction and an unlabeled fraction, wherein the gender-specific tandem repeat sequence contains a target sequence having consecutive purine sequences or consecutive homopyrimidine sequences, wherein the target sequence of the gender-specific tandem repeat sequence has about 12 to about 24 nucleotides, wherein the gender-specific tandem repeat sequence is repeated at least 50 times on the respective chromosome of the labeled fraction, wherein the labeled oligonucleotide moiety comprises a triplex forming oligonucleotide moiety that binds to the target sequence, and wherein the labeled oligonucleotides moiety comprises a CY3 dye linked to a 5′
-end of the triplex forming oligonucleotide with an ester bond;b) detecting a signal that distinguishes the labeled fraction and the unlabeled fraction; and c) separating the labeled fraction from the unlabeled fraction forming a separated labeled fraction and a separated unlabeled fraction, wherein at least about 40% of each of the separated labeled fraction and the separated unlabeled fractions contain viable sperm cells that can be used for in vivo or in vitro fertilization. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for separating a population of sperm cells having an X chromosome and a Y chromosome, the method comprising:
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a) contacting the population of sperm cells with a labeled oligonucleotide moiety capable of binding to a gender-specific tandem repeat sequence that is repeated on either the Y chromosome or the X chromosome in a portion of the population of sperm cells to provide a labeled fraction and an unlabeled fraction, wherein the gender-specific tandem repeat sequence contains a target sequence having consecutive purine sequences or consecutive homopyrimidine sequences, wherein the target sequence of the gender-specific tandem repeat sequence has about 12 to about 24 nucleotides, wherein the labeled oligonucleotide moiety is capable of binding to a major groove of a DNA duplex of the gender-specific tandem repeat sequence in the labeled fraction, and wherein the gender-specific tandem repeat sequence is repeated at least 50 times on the respective chromosome of the labeled fraction, wherein the labeled oligonucleotide moiety comprises a triplex forming oligonucleotide moiety that binds to the target sequence, and wherein the labeled oligonucleotides moiety comprises a CY3 dye linked to a 5′
-end of the triplex forming oligonucleotide with an ester linkage;b) detecting a signal that distinguishes the labeled fraction and the unlabeled fraction; and c) separating the labeled fraction from the unlabeled fraction forming a separated labeled fraction and a separated unlabeled fraction, wherein at least about 40% of the labeled fraction contains viable sperm cells that can be used for in vivo or in vitro fertilization.
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Specification