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Constraints on mutability in a multiallelic gene family
1Breeding and Genetics Department, Horticulture Research International, Wellesbourne, Warwick, United Kingdom.
Journal of Molecular Evolution
|December 1, 1995
Summary
Local DNA sequence environment significantly impacts mutation rates. Factors like nucleotide neighbors and helical stability influence substitution patterns in the Brassica self-incompatibility gene family.
Area of Science:
- Molecular Biology
- Genetics
- Bioinformatics
Background:
- The Brassica self-incompatibility gene family exhibits high levels of nonsynonymous mutations.
- Understanding the factors influencing mutation is crucial for evolutionary and genetic studies.
Purpose of the Study:
- To investigate the effect of local sequence environment on substitution mutation rates.
- To identify sequence-dependent factors associated with increased mutation frequency.
Main Methods:
- Alignment and grouping of 29 Brassica self-incompatibility gene sequences.
- Calculation of substitution mutation levels and distribution.
- Analysis of neighbor biases, helical stability, curvature, and stacking interactions.
Main Results:
- A nonrandom distribution of sequence variation was observed.
- Nucleotide A or C as a 5' neighbor was associated with higher mutation rates.
- Decreased helical stability and specific curvature components (wedge angle, twist) correlated with increased mutation.
Conclusions:
- Local sequence context, including nucleotide neighbors and DNA structure, plays a significant role in mutation patterns.
- These findings provide insights into the mechanisms driving genetic variation in gene families.