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Chromosomal distribution of the human cardiovascular transcriptome
J David Barrans1, James Ip, Ching-Wan Lam
1The Cardiovascular Genome Unit, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, 75 Francis St., Thorn 1334, Boston, MA 02115, USA.
Genomics
|April 23, 2003
Summary
This study investigated the genome-wide distribution of cardiovascular gene transcripts. Findings reveal specific chromosomal regions with higher concentrations of heart-related genes, suggesting tissue-specific gene organization in the human genome.
Area of Science:
- Genomics
- Human Genetics
- Molecular Biology
Background:
- Previous observations suggested non-random gene distribution for chromosomes 21 and 22.
- Cardiovascular gene transcript organization in the human genome remains incompletely understood.
Purpose of the Study:
- To investigate the hypothesis of tissue-specific organization of cardiovascular gene transcripts.
- To map and analyze the distribution of heart-derived transcripts across the human genome.
Main Methods:
- Utilized a dataset of 4628 fetal and 3574 adult cardiovascular expressed-sequence tags (cvESTs).
- Mapped cvESTs to 5-megabase (Mb) chromosomal windows using public sequence mapping data.
- Analyzed cvEST distribution relative to genome-wide gene density.
Main Results:
- Chromosome 17 showed the highest proportion of cvESTs (19.2% fetal, 16.5% adult); Chromosome Y had the lowest (2.0%).
- Fifty of 639 chromosomal windows exhibited a significantly higher proportion of cvESTs than expected by chance (P < 0.003).
- These cvEST-enriched windows were predominantly located on gene-dense chromosomes (17, 19, 22).
Conclusions:
- The human genome exhibits a non-random, tissue-specific organization of cardiovascular gene transcripts.
- This organization may play a role in complex, tissue-specific gene regulation.
- Findings provide insights into the spatial arrangement of genes related to heart function within the genome.