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Updated: Jul 31, 2026
07:34
FISH for Pre-implantation Genetic Diagnosis
Published on: February 24, 2011
Complex satellite DNA reshuffling in the polymorphic t(1;29) Robertsonian translocation and evolutionarily derived
R Chaves1, F Adega, J S Heslop-Harrison
1Department of Genetics and Biotechnology, Centre of Genetics and Biotechnology ICETA-UTAD, University of Trás-os-Montes and Alto Douro, P-5000-911 Vila Real, Portugal. rchaves@utad.pt
Summary
Satellite DNA families I, III, and IV were mapped to cattle centromeres. Their distribution on the t(1;29) translocation chromosome suggests unique evolutionary events, offering insights into centromeric evolution in bovids.
Area of Science:
- Genetics
- Molecular Biology
- Evolutionary Biology
Background:
- Satellite DNA sequences are crucial components of centromeres, influencing chromosome structure and evolution.
- Understanding the organization and behavior of satellite DNA in cattle is important for genomic studies and conservation efforts.
Purpose of the Study:
- To physically map satellite DNA families I, III (pvu and sau subunits), and IV in cattle.
- To investigate the distribution of these satellite DNAs in different cattle breeds and chromosomal constitutions, including the t(1;29) translocation.
Main Methods:
- In-situ hybridization was employed to physically map the satellite DNA sequences.
- Analysis included four cattle breeds with varying chromosome numbers (2n=60, 2n=58, 2n=59) due to the t(1;29) translocation.
Main Results:
- Satellite DNA families I, III, and IV were localized to the centromeres of most autosomal acrocentric chromosomes but were largely absent from sex chromosomes.
- The t(1;29) translocation chromosome exhibited a distinct satellite DNA pattern, not simply a fusion of parental chromosomes, with no inter-breed variation.
- A model proposing two independent events in centromeric evolution was presented.
Conclusions:
- The distinct satellite DNA pattern on the t(1;29) chromosome indicates complex mechanisms of translocation formation and centromeric evolution.
- This research provides insights into centromere and satellite DNA dynamics, chromosomal abnormalities, and evolutionary fusion events in bovids.
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