Synteny and regional marker order assignment of 26 type I and microsatellite markers to the horse X- and Y-chromosomes.
Abstract: The hypothesis that the conservation of sex-chromosome-linked genes among placental mammals could be extended to the horse genome was tested using the UCDavis horse-mouse somatic cell hybrid (SCH) panel. By exploiting the fluorescence in-situ hybridization (FISH) technique to localize an anchor locus, X-inactivation-specific transcript (XIST) on the horse X chromosome, together with the fragmentation and translocation of the X- and Y-chromosome fragments in a somatic cell hybrid panel, we regionally assigned 13 type I and 13 type II (microsatellite) markers to the horse X- and Y-chromosomes. The synteny groups that correspond to horse X- and Y-chromosomes were identified by synteny mapping of sex-specific loci zinc finger protein X-linked (ZFX), zinc finger protein Y-linked (ZFY) and sex-determining region Y (SRY) on the SCH panel. A non-pseudoautosomal gene in the human steroid sulfatase (STS) was identified in both X- and Y-chromosome-containing clones. The regional order of the X-linked type I markers examined in this study, from Xp- to Xq-distal, was [STS-X, the voltage-gated chloride channel 4 (CLCN4)], [ZFX, delta-aminolevulinate synthase 2 (ALAS2)], XIST, coagulation factor IX (F9) and [biglycan (BGN), equine F18, glucose-6-phosphate dehydrogenase (G6PD)] (precise marker order could not be determined for genes within the same brackets). The order of the Y-linked type I markers was STS-Y, SRY and ZFY These orders are the same arrangements as reported for the human X- and Y-chromosomes, supporting the conservation of genomic organization between the human and the horse sex chromosomes. Regional ordering of X-linked type I and microsatellite markers provides the first integration of type I and type II markers in the horse X chromosome.
Publication Date: 2000-03-24 PubMed ID: 10730588DOI: 10.1023/a:1009275102977Google Scholar: Lookup
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- Journal Article
Summary
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The research article investigates whether the conservation of sex-chromosome-linked genes found in other placental mammals also extends to horses. Using a combination of scientific techniques, it identifies and places markers on horse X- and Y-chromosomes, confirming that the genetic organization of horse sex chromosomes is similar to that of humans.
Techniques Utilized
- The researchers employed a somatic cell hybrid (SCH) panel, specifically developed at UCDavis, to study hybrid cells containing both horse and mouse genetic material.
- As part of the study, fluorescence in-situ hybridization (FISH) was used. This is a modern technique that involves painting chromosomes with fluorescent markers, allowing researchers to visualize specific genetic sequences.
- Using FISH, the researchers were able to localize an anchor locus – in this case, the X-inactivation-specific transcript (XIST) gene on the horse X chromosome.
Identification and Ordering of Genetic Markers
- Using the SCH panel, the team was successful in assigning 13 type I and 13 type II (microsatellite) markers to the horse X- and Y-chromosomes.
- The markers were identified by mapping of sex-specific loci, including the zinc finger protein X-linked (ZFX), zinc finger protein Y-linked (ZFY) and sex-determining region Y (SRY), onto the SCH panel.
- They were also able to identify a gene commonly found on the X and Y chromosomes in humans – the steroid sulfatase (STS).
- The team was able to broadly order the markers from Xp- to Xq-distal along the X chromosome and identify the order of the Y-linked type I markers.
- Interestingly, the order in which these markers were found is consistent with what is observed on human sex chromosomes, suggesting a conservation of genomic organization between humans and horses.
Significance of Findings
- This research represents the first integration of type I and type II markers on the horse X chromosome, advancing our understanding of horse genetic makeup.
- The conservation of genomic organization between human and horse sex chromosomes could have a range of implications, particularly for comparative genomics and potentially for veterinary medicine.
Cite This Article
APA
Shiue Y-L , Millon LV, Skow LC, Honeycutt D, Murray JD, Bowling AT.
(2000).
Synteny and regional marker order assignment of 26 type I and microsatellite markers to the horse X- and Y-chromosomes.
Chromosome Res, 8(1), 45-55.
https://doi.org/10.1023/a:1009275102977 Publication
Researcher Affiliations
- Veterinary Genetics Laboratory, School of Veterinary Medicine, University of California, Davis 95616-8744, USA.
MeSH Terms
- Animals
- Chromosome Mapping
- Genetic Markers
- Horses / genetics
- Humans
- Hybrid Cells
- In Situ Hybridization, Fluorescence
- Microsatellite Repeats
- Pseudogenes
- X Chromosome
- Y Chromosome
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Citations
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