Pax genes

Pax genes

Paired box (Pax) genes are a family of tissue specific transcription factors containing a paired domain and usually a partial or complete homeodomain. An octapeptide may also be present. Pax proteins are important in early animal development for the specification of specific tissues, as well as during epimorphic limb regeneration in animals capable of such.


Within the mammalian family, there are four well defined groups of Pax genes.
*Pax group 1 (Pax 1 and 9),
*Pax group 2 (Pax 2, 5 and 8),
*Pax group 3 (Pax 3 and 7) and
*Pax group 4 (Pax 4 and 6).

Orthologous genes exist throughout the Metazoa, including extensive study of the ectopic expression in Drosophila using murine Pax6.


* PAX1 has been identified in mice with the development of vertebrate and embryo segmentation, and some evidence this is also true in humans. It transcribes a 440 amino acid protein from 4 exons and 1,323bps in humans.

* PAX2 has been identified with kidney and optic nerve development. It transcribes a 417 amino acid protein from 11 exons and 4,261 bps in humans. Mutation of PAX2 in humans has been associated with renal-coloboma syndrome as well as oligomeganephronia. [OMIM|167409]

* PAX3 has been identified with ear, eye and facial development. It transcribes a 479 amino acid protein in humans. Mutations in it can cause Waardenburg syndrome.

* PAX4 has been identified with pancreatic islet beta cells. It transcribes a 350 amino acid protein from 9 exons and 2,010 bps in humans.

* PAX5 has been identified with neural and spermatogenesis development and b-cell differentiation. It transcribes a 391 amino acid protein from 10 exons and 3,644bps in humans.

* PAX6 is the most researched and appears throughout the literature as a "master control" gene for the development of eyes and sensory organs, certain neural and epidermal tissues as well as other homologous structures, usually derived from ectodermal tissues.

* PAX7 has been possibly associated with myogenesis. It transcribes a protein of 520 amino acids from 8 exons and 2,260bps in humans. PAX7 is required for the developmental specification of satellite cells in skeletal muscle.

* PAX8 has been associated with thyroid specific expression. It transcribes a protein of 451 amino acids from 11 exons and 2,526bps in humans.

* PAX9 has found to be associated with a number of organ and other skeletal developments, particularly teeth. It transcribes a protein of 341 amino acids from 4 exons and 1,644bps in humans.

ee also

* Homeobox
* Evolutionary developmental biology
* Body plan
* SOX genes


Further reading

*cite journal
first=Charles S.
authorlink=Charles Zuker
title=On the evolution of eyes: would you like it simple or compound?

*cite journal
coauthors=Walldorf, Uwe; Kloter U; Gehring WJ
title=Homology of the eyeless gene of Drosophila to the small eye gene in mice and Aniridia in humans.

External links

* [ A Review of the Highly Conserved PAX6 Gene in Eye Development Regulation]
* [ Paired domain] in PROSITE

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Pax genes — Mouse genes that contain a DNA binding domain similar to one in the paired genes of Drosophila. 8 Pax genes have been identified, and most of them are expressed in the nervous system during development. A number of mouse mutations have been found …   Dictionary of molecular biology

  • PAX genes — [paired box; named for a conserved protein domain] a family of genes involved in developmental control, regulating tissue development and cellular differentiation in embryos. They encode transcription factors and are highly conserved across… …   Medical dictionary

  • Pax — Contents 1 Organizations 2 Locations 3 Software 4 Popul …   Wikipedia

  • Pax — Saltar a navegación, búsqueda El término Pax, período de hegemonía de un estado sobre otros de su alrededor durante el cual se establece una paz interna en sus dominios (imperio) y esfera de influencia, puede hacer referencia a: La Pax Romana. La …   Wikipedia Español

  • Pax (gen) — Los genes Pax o PAX (del inglés Paired box ) son una familia de factores de transcripción de tejidos que contienen una pareja de dominios y un homeodominio parcial o completo. Las proteínas Pax son muy importantes en el desarrollo animal temprano …   Wikipedia Español

  • Genes homeóticos — Los genes homeóticos son genes que participan en el desarrollo de los organismos y que determinan la identidad de los segmentos o partes individuales del embrión en sus etapas iniciales. La función normal de los genes homeóticos consiste en… …   Wikipedia Español

  • Pax-8 — Paired Box Protein 8 PAX 5 (gelb) mit ETS 1 (grün) auf DNA (blau) nach PDB  …   Deutsch Wikipedia

  • Pax 8 — Paired Box Protein 8 PAX 5 (gelb) mit ETS 1 (grün) auf DNA (blau) nach PDB  …   Deutsch Wikipedia

  • Gènes de segmentation — Les gènes de segmentation sont des gènes zygotiques intervenant dans l expression du programme génétique du développement embryonnaire. Ces gènes sont activés en amont par des gènes maternels, eux mêmes à l origine de la formation des axes… …   Wikipédia en Français

  • paired box genes — PAX genes …   Medical dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.