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Population structure of the human pseudoautosomal boundary
N Ellis1, A Taylor, B O Bengtsson
1Imperial Cancer Research Fund, Lincoln's Inn Fields, London, UK.
Nature
|April 12, 1990
Summary
Human sex chromosomes show distinct variations. While X chromosomes exhibit multiple genetic differences in the boundary region, Y chromosomes are largely identical, with only one shared polymorphism.
Area of Science:
- Genetics
- Human Evolution
- Molecular Biology
Background:
- Mammalian sex chromosomes (X and Y) consist of pseudoautosomal regions (PAR) enabling recombination and distinct sex chromosome-specific regions.
- Human sex chromosomes differ in a boundary region due to an Alu element insertion on the Y chromosome.
Purpose of the Study:
- To investigate sequence variation in the boundary region of human sex chromosomes.
- To analyze genetic diversity across different human populations.
Main Methods:
- Utilized the polymerase chain reaction (PCR) to survey sequence variation.
- Analyzed 57 Y and 60 X chromosomes from ten diverse human populations.
Main Results:
- X chromosomes displayed polymorphism at five positions within a 300-base-pair region.
- Y chromosomes were found to be highly conserved, with all samples being identical except for one distal polymorphism shared with the X chromosome.
Conclusions:
- Significant sequence variation exists on the human X chromosome boundary region.
- The human Y chromosome boundary region is evolutionarily conserved, with limited genetic diversity observed.