Origin of human chromosome 2: An ancestral telomere-telomere fusion

J. W. Ijdo; A. Baldini; D. C. Ward; S. T. Reeders; R. A. Wells

Origin of human chromosome 2: An ancestral telomere-telomere fusion

J. W. Ijdo, A. Baldini, D. C. Ward, S. T. Reeders, R. A. Wells

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Abstract

We have identified two allelic genomic cosmids from human chromosome 2, c8.1 and c29B, each containing two inverted arrays of the vertebrate telomeric repeat in a head-to-head arrangement, 5′(TTAGGG)_n-(CCCTAA)_m3′. Sequences flanking this telomeric repeat are characteristic of present-day human pretelomeres. BAL-31 nuclease experiments with yeast artificial chromosome clones of human telomeres and fluorescence in situ hybridization reveal that sequences flanking these inverted repeats hybridize both to band 2q13 and to different, but overlapping, subsets of human chromosome ends. We conclude that the locus cloned in cosmids c8.1 and c29B is the relic of an ancient telomere-telomere fusion and marks the point at which two ancestral ape chromosomes fused to give rise to human chromosome 2.

Original language	English (US)
Pages (from-to)	9051-9055
Number of pages	5
Journal	Proceedings of the National Academy of Sciences of the United States of America
Volume	88
Issue number	20
State	Published - Oct 15 1991
Externally published	Yes

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abstract = "We have identified two allelic genomic cosmids from human chromosome 2, c8.1 and c29B, each containing two inverted arrays of the vertebrate telomeric repeat in a head-to-head arrangement, 5′(TTAGGG)n-(CCCTAA)m3′. Sequences flanking this telomeric repeat are characteristic of present-day human pretelomeres. BAL-31 nuclease experiments with yeast artificial chromosome clones of human telomeres and fluorescence in situ hybridization reveal that sequences flanking these inverted repeats hybridize both to band 2q13 and to different, but overlapping, subsets of human chromosome ends. We conclude that the locus cloned in cosmids c8.1 and c29B is the relic of an ancient telomere-telomere fusion and marks the point at which two ancestral ape chromosomes fused to give rise to human chromosome 2.",

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AU - Ijdo, J. W.

AU - Baldini, A.

AU - Ward, D. C.

AU - Reeders, S. T.

AU - Wells, R. A.

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AB - We have identified two allelic genomic cosmids from human chromosome 2, c8.1 and c29B, each containing two inverted arrays of the vertebrate telomeric repeat in a head-to-head arrangement, 5′(TTAGGG)n-(CCCTAA)m3′. Sequences flanking this telomeric repeat are characteristic of present-day human pretelomeres. BAL-31 nuclease experiments with yeast artificial chromosome clones of human telomeres and fluorescence in situ hybridization reveal that sequences flanking these inverted repeats hybridize both to band 2q13 and to different, but overlapping, subsets of human chromosome ends. We conclude that the locus cloned in cosmids c8.1 and c29B is the relic of an ancient telomere-telomere fusion and marks the point at which two ancestral ape chromosomes fused to give rise to human chromosome 2.

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Origin of human chromosome 2: An ancestral telomere-telomere fusion

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