Identification of Hox genes in newborn lung and effects of gestational age and retinoic acid on their expression
| Autor: | Diane W. Dynia, Ian Gross, Christine M. Wilson, Clifford W. Bogue, Hemaxi Vasavada, Harris C. Jacobs |
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| Rok vydání: | 1994 |
| Předmět: |
Pulmonary and Respiratory Medicine
animal structures Transcription Genetic Physiology Molecular Sequence Data Retinoic acid Gene Expression Gestational Age Mice Inbred Strains Tretinoin Biology Polymerase Chain Reaction Rats Sprague-Dawley Mice chemistry.chemical_compound Fetus Physiology (medical) Gene expression Animals Amino Acid Sequence RNA Messenger Hox gene Lung Gene Genetics Embryogenesis Genes Homeobox Cell Biology Molecular biology Rats Animals Newborn chemistry Molecular Probes embryonic structures Homeobox Homeotic gene |
| Zdroj: | American Journal of Physiology-Lung Cellular and Molecular Physiology. 266:L448-L454 |
| ISSN: | 1522-1504 1040-0605 |
| DOI: | 10.1152/ajplung.1994.266.4.l448 |
| Popis: | Hox genes are sequence-specific DNA transcription factors, which are important in embryonic development and are expressed in a number of fetal tissues, including the lung. Additionally, retinoic acid (RA) has been shown to modulate Hox gene expression in a number of cell types. The specific aims of this study were to 1) identify those Hox genes expressed in newborn mouse lung using reverse transcription-polymerase chain reaction (RT-PCR), 2) study the ontogeny of Hox gene expression in fetal mouse and rat lung by Northern analysis using cDNAs for mouse Hox genes, and 3) study the effects of RA on whole lung Hox mRNA levels in cultured fetal rat lung explants. Our data show that 16 different homeobox genes are expressed in newborn mouse lung. This includes seven Hox genes not previously identified in lung, as well as the divergent homeobox gene Hex. Steady-state mRNA levels of Hox A5 (Hox 1.3), B5 (Hox 2.1), B6 (Hox 2.2), and B8 (Hox 2.4) decrease with advancing gestational age in mouse lungs (E14 to adult). Similarly, Hox A5, B5, and B6 follow the same decreasing pattern of expression with advancing gestational age in rat lungs (E15 to adult). RA treatment of E17 rat lung explants in culture resulted in a significant dose- and time-dependent increase in Hox A5, B5, and B6 mRNA levels. The highest mRNA levels were seen in explants treated with 1 x 10(-5) M RA for 4-16 h. We conclude that there are many homeobox genes expressed in developing rodent lung and that their mRNA levels are affected by both gestational age and RA. |
| Databáze: | OpenAIRE |
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