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Comparative sequence analysis of human minisatellites showing meiotic repeat instability
1Department of Genetics, University of Leicester, Leicester LE1 7RH, UK.
Genome Research
|February 19, 1999
Summary
Human minisatellites exhibit germline instability due to recombination. Comparative sequence analysis found no common flanking DNA elements controlling this instability, suggesting it is not driven by sequence features or gene promoters.
Area of Science:
- Genetics
- Molecular Biology
Background:
- Human minisatellites are highly variable DNA sequences.
- Instability in minisatellites like MS32, MS31A, and CEB1 is linked to germline recombination.
- Recombination can lead to repeat instability and crossovers extending into flanking DNA.
Purpose of the Study:
- To investigate common flanking DNA elements associated with minisatellite instability.
- To determine if cis-acting elements in flanking DNA influence repeat instability.
- To explore the genomic environment of unstable minisatellites.
Main Methods:
- Comparative sequence analysis of flanking DNA regions for three human minisatellites (MS32, MS31A, CEB1).
- Examination of GC-rich DNA, repetitive elements, putative coding sequences, thermal stability, and DNA secondary structures in flanking regions.
Main Results:
- All three minisatellites are located in GC-rich DNA with repetitive elements.
- No significant sequence similarities were found in the upstream flanking DNA.
- No consistent patterns in thermal stability or DNA secondary structure were observed in flanking DNA.
Conclusions:
- Recombinational activity in minisatellites is not controlled by primary or secondary DNA sequence characteristics of flanking regions.
- Instability is not obviously associated with gene promoters.
- This study expands understanding of the genomic context of minisatellite instability.