The k43 gene, required for chorion gene amplification and diploid cell chromosome replication, encodes the Drosophila homolog of yeast origin recognition complex subunit 2

Gary Landis, Richard Kelley, Allan C. Spradling, John Tower

Research output: Contribution to journalArticle

Abstract

Lethal alleles of the Drosophila k43 gene result in small or missing imaginal discs, greatly reduced mitotic index, and fragmented and abnormally condensed chromosomes. A female-sterile allele of k43 specifically reduces chorion gene amplification in ovarian follicle cells. k43 was cloned by chromosomal walking, and the identification of the k43 gene was confirmed by phenotypic rescue and sequence analysis of mutant alleles. The sequence analyses reveal that the k43 gene encodes the Drosophila homolog of the yeast origin recognition complex subunit 2 (Orc2p), a protein required for replication origin function and transcriptional silencing in yeast. These results suggest an evolutionarily conserved role for Orc2p in eukaryotic chromosomal DNA replication.

Original languageEnglish (US)
Pages (from-to)3888-3892
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume94
Issue number8
DOIs
StatePublished - Apr 15 1997
Externally publishedYes

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Origin Recognition Complex
Chorion
Gene Amplification
Diploidy
Drosophila
Chromosomes
Yeasts
Sequence Analysis
Alleles
Lethal Genes
Genes
Imaginal Discs
Mitotic Index
Replication Origin
Ovarian Follicle
DNA Replication
Walking
Proteins

ASJC Scopus subject areas

  • Genetics
  • General

Cite this

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T1 - The k43 gene, required for chorion gene amplification and diploid cell chromosome replication, encodes the Drosophila homolog of yeast origin recognition complex subunit 2

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AU - Kelley, Richard

AU - Spradling, Allan C.

AU - Tower, John

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AB - Lethal alleles of the Drosophila k43 gene result in small or missing imaginal discs, greatly reduced mitotic index, and fragmented and abnormally condensed chromosomes. A female-sterile allele of k43 specifically reduces chorion gene amplification in ovarian follicle cells. k43 was cloned by chromosomal walking, and the identification of the k43 gene was confirmed by phenotypic rescue and sequence analysis of mutant alleles. The sequence analyses reveal that the k43 gene encodes the Drosophila homolog of the yeast origin recognition complex subunit 2 (Orc2p), a protein required for replication origin function and transcriptional silencing in yeast. These results suggest an evolutionarily conserved role for Orc2p in eukaryotic chromosomal DNA replication.

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