Nucleic acid probes for prenatal sexing
First Claim
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1. A labeled or unlabeled single-stranded nucleic acid which comprises:
- (a) a segment which has substantially the same sequence as that of either strand of the 6.2 kbp EcoRI fragment of the genome of lambda-ES6.0;
or(b) any segment, more than 20 bp in length, of the segment of subparagraph (a) of this Claim;
provided that said single-stranded nucleic acid hybridizes to a significantly greater extent with total DNA of males of a breed of a species of genus Bos than with total DNA of females of the breed.
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Abstract
Nucleic acid hybridizaiton probes are provided which have sequences complementary to sequences of segments in bovine male-specific DNA and are suitable for sexing bovine embryos at the time of embryo transfer with nearly 100% accuracy.
10 Citations
33 Claims
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1. A labeled or unlabeled single-stranded nucleic acid which comprises:
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(a) a segment which has substantially the same sequence as that of either strand of the 6.2 kbp EcoRI fragment of the genome of lambda-ES6.0;
or(b) any segment, more than 20 bp in length, of the segment of subparagraph (a) of this Claim; provided that said single-stranded nucleic acid hybridizes to a significantly greater extent with total DNA of males of a breed of a species of genus Bos than with total DNA of females of the breed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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- 16. A labeled or unlabeled single-stranded DNA which is more than 20 bp in length, which under stringent conditions hybridizes to a significantly greater extent with total DNA of males of a breed of genus Bos selected from the group consisting of Hereford and Holstein than with total DNA of females of the breed, and which is made by the process of denaturing DNA made by nick-translation of a DNA selected from the group consisting of plasmid pES5(2), plasmid pES8 and the genome of lambda-ES6.0.
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19. E. coli LE392 (pES5(2) or E. coli LE392 (pES8).
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20. Phage lambda-ES6.0.
- 21. A double-stranded DNA which has substantially the same sequence as a DNA selected from the group consisting of the genome of lambda-ES6.0, the 6.2 kbp EcoRI fragment of the genome of lambda-ES6.0, the 4.0 kbp EcoRI fragment of the genome of lambda-ES6.0, and the 2.2 kbp EcoRI fragment of the genome of lambda-ES6.0.
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27. A method of sexing an embryo or fetus of a species of a genus Bos which comprises:
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(i) contacting the DNA of cells of said embryo or fetus under hybridization conditions with one or more hybridization probes, each of which is a detectably labeled, single-stranded nucleic acid which comprises; (a) a segment which has substantially the same sequence as that of either strand of a fragment selected from the group consisting of; (1) the smaller PstI fragment of plasmid pES5(2), (2) the smaller PstI fragment of plasmid pES8, and (3) the 6.2 kbp EcoRI fragment of the genome of lambda-ES6.0;
or(b) any segment, more than 20 bp in length, of the segment of subparagraph (i)(a) of this claim; provided that at least one of said single-stranded nucleic acids, under the hybridization conditions, hybridizes to a significantly greater extent with total DNA of males of a breed of a species of the genus Bos than with total DNA of females of the breed; and (ii) ascertaining whether significant hybridization occurs between the DNA of the cells of the embryo or fetus and the hybridization probe or probes, wherein significantly greater hybridization is an indication of the presence of a male embryo or fetus. - View Dependent Claims (28, 29, 30, 31, 32, 33)
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Specification