homeotic genes

homeotic genes
a family of genes, first observed in Drosophila, that orchestrate the development of individual embryonic segments into specific body parts; they occur in one or more clusters, are expressed in specific patterns at particular stages in embryogenesis, and are highly conserved across many species, all of them containing conserved homeobox (q.v.) sequences. They encode transcription factors, and mutations often have pleiotropic effects, particularly developmental defects or cancer.

Medical dictionary. 2011.

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  • homeotic genes — Genes that act in concert to determine fundamental patterns of development …   Glossary of Biotechnology

  • Homeotic gene — Homeotic genes specify the anterior posterior axis and segment identity during early development of metazoan organisms. They are critical for the proper placement and number of embryonic segment structures (such as legs, antennae and eyes).The… …   Wikipedia

  • homeotic gene — Gene, containing homeobox, the level of expression of which is set during embryogenesis in response to positional cues, and which then directs the later formation of tissues and appendages appropriate to that part of the organism. Mutation of… …   Dictionary of molecular biology

  • homeotic gene — noun one the genes that are involved in embryologic development • Hypernyms: ↑gene, ↑cistron, ↑factor • Hyponyms: ↑homeobox, ↑homeobox gene * * * noun : a gene that produces a usually major shift in the developmental fate of an organ or body pa …   Useful english dictionary

  • HOX genes — [homeobox containing] name for homeotic genes (q.v.) of vertebrates; they occur in four clusters of approximately 11 genes each, and are expressed along the dorsal axis from the hindbrain to the tail region. By convention, written Hox g s for… …   Medical dictionary

  • Hox gene — Hox genes are a group of related genes that determine the basic structure and orientation of an organism.[1] Hox genes are critical for the proper placement of segment structures of animals during early embryonic development (e.g. legs, antennae …   Wikipedia

  • Regional specification — In the field of developmental biology, regional specification is the process by which different areas are identified in the development of the early embryo. The process by which the cells become specified differs between organisms. Contents 1… …   Wikipedia

  • MADS-box — The MADS box is a conserved sequence motif found in genes which comprise the MADS box gene family.[1] The MADS box encodes the DNA binding MADS domain. The MADS domain binds to DNA sequences of high similarity to the motif CC[A/T]6GG termed the… …   Wikipedia

  • Desarrollo floral — Diagrama de la expresión diferencial de los genes A, B y C en los distintos verticilos de una flor de Arabidopsis. El desarrollo floral o desarroll …   Wikipedia Español

  • transcription factor — ▪ biology       molecule that controls the activity of a gene by determining whether the gene s DNA (deoxyribonucleic acid) is transcribed into RNA (ribonucleic acid). The enzyme RNA polymerase catalyzes the chemical reactions that synthesize RNA …   Universalium

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