Abstract
Based on a recently generated comprehensive gene map for Ovis aries chromosome X (OARX) with an approximately even locus distribution, we assigned selected bacterial artificial chromosome (BAC) probes corresponding to these OARX loci to Bubalus bubalis (BBU) and Bos taurus (BTA) by comparative fluorescence in-situ hybridization (FISH) to improve cytogenetically the X chromosome maps in these species. Twenty-five added loci in BBUX and BTAX, respectively, contribute to a more detailed description of the cytogenetic organization of these chromosomes. Further seven loci were identified in OARX and two DNA probes were assigned to X and Y chromosomes in river buffalo, cattle, and sheep, respectively, and thus identified loci in the pseudoautosomal region. The additional assignments double the number of cytogenetic loci in BBUX and increase their number in BTAX and OARX. The larger quantity of cytogenetic anchors allows a more precise morphological comparison of bovid X chromosomes among each other and with the Homo sapiens (HSA) X chromosome. The anchor loci confirm and refine syntenic fragments in HSAX and identify several evolutionary breakpoints between the compared chromosomes. The cytogenetic assignments in BBUX, BTAX, and OARX represent useable anchors for the ongoing genome sequence assembly in Bovidae.




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- BAC:
-
Bacterial artificial chromosome
- BBU:
-
Bubalus bubalis
- BES:
-
BAC end sequence
- BLAST:
-
Basic local alignment search tool
- BTA:
-
Bos taurus
- CSKBB:
-
Committee for Standardized Karyotype of Bubalus bubalis
- DABCO:
-
1,4-Diazabicyclo[2.2.2]octan
- FISH:
-
Fluorescence in-situ hybridization
- FITC:
-
Fluorescein isothiocyanate
- HSA:
-
Homo sapiens
- ISCNDB:
-
International System for Chromosome Nomenclature of Domestic Bovids
- ISCN:
-
International System for Human Cytogenetic Nomenclature
- OAR:
-
Ovis aries
- OGA:
-
Ovine Genome Assembly
- PAB:
-
Pseudoautosomal boundary
- PAR:
-
Pseudoautosomal region
- PI:
-
Propidium iodide
- RH:
-
Radiation hybrid
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Referenced web pages
BACAPAC Resources—CHORI-243 library: http://bacpac.chori.org/library.php?id=162
Bovmap database: http://locus.jouy.inra.fr/
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Sheep database: www.thearkdb.org
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Acknowledgments
The authors wish to thank Mr. Domenico Incarnato, CNR-ISPAAM, for his excellent technical assistance. Financial support for this study came from the following projects: PSR-Misura 214e2 RARECa, CISIA-VARIGEAV, and by DFG-Grant GO-896/6-3 from the German Research Foundation.
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Perucatti, A., Genualdo, V., Iannuzzi, A. et al. Advanced comparative cytogenetic analysis of X chromosomes in river buffalo, cattle, sheep, and human. Chromosome Res 20, 413–425 (2012). https://doi.org/10.1007/s10577-012-9285-0
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DOI: https://doi.org/10.1007/s10577-012-9285-0


