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Two DNA sequences specific for the canine Y chromosome
1James A Baker Institute for Animal Health, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA.
Animal Genetics
|August 12, 1998
Summary
Researchers identified two novel DNA sequences unique to male dogs. These sequences are specific to the canine Y chromosome and do not contain the SRY gene segment.
Area of Science:
- Canine genetics
- Molecular biology
- Sex determination
Background:
- The canine Y chromosome plays a crucial role in male sex determination.
- Identifying Y-chromosome-specific sequences is essential for understanding canine genetics and breeding.
Purpose of the Study:
- To characterize novel nucleotide sequences found exclusively in male dog DNA.
- To determine if these sequences are located on the canine Y chromosome.
Main Methods:
- Polymerase chain reaction (PCR) amplification using arbitrary and specific primers.
- DNA sequencing and cloning of male-specific fragments.
- Southern blot analysis and hybridization.
- Comparison with the canine SRY gene.
Main Results:
- Two male-specific DNA segments (650 and 990 bp) were amplified via PCR.
- These sequences were exclusively detected in male dog DNA (34 males) and not in female DNA (42 females).
- Southern analysis confirmed the male-specific presence of these sequences, with no homology to the SRY gene.
Conclusions:
- The two novel nucleotide sequences are specific to the canine Y chromosome.
- These sequences do not encompass the characterized portion of the SRY gene.