Talk:BGDB Sexual Differentiation - Sex Determination: Difference between revisions
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BGD Internal Links 2009 Male/Female Practical [http://embryology.med.unsw.edu.au/Medicine/BGDlabXYXX_1.htm 1. Sex Determination] | BGD Internal Links 2009 Male/Female Practical [http://embryology.med.unsw.edu.au/Medicine/BGDlabXYXX_1.htm 1. Sex Determination] | ||
'''1991''' - The initiator of the X inactivation process was discovered (1991) to be regulated by a region on the inactivating X chromosome encoding an X inactive specific transcript (XIST), that acts as RNA and does not encode a protein. Furthermore X inactivation occurs randomly throughout the embryo, generating a mosaic of maternal and paternally derived X chromosome activity in all tissues and organs. | |||
<pubmed>1985261</pubmed> | |||
[http://www.ncbi.nlm.nih.gov/omim/300624 OMIM300624 - FRAGILE X MENTAL RETARDATION SYNDROME] | |||
* Fragile X mental retardation is characterized by moderate to severe mental retardation, macroorchidism, and distinct facial features, including long face, large ears, and prominent jaw. In most cases, the disorder is caused by the unstable expansion of a CGG repeat in the FMR1 gene and abnormal methylation, which results in suppression of FMR1 transcription and decreased protein levels in the brain (Devys et al., 1993). | |||
Latest revision as of 10:11, 29 May 2011
BGD Internal Links 2009 Male/Female Practical 1. Sex Determination
1991 - The initiator of the X inactivation process was discovered (1991) to be regulated by a region on the inactivating X chromosome encoding an X inactive specific transcript (XIST), that acts as RNA and does not encode a protein. Furthermore X inactivation occurs randomly throughout the embryo, generating a mosaic of maternal and paternally derived X chromosome activity in all tissues and organs.
<pubmed>1985261</pubmed>
OMIM300624 - FRAGILE X MENTAL RETARDATION SYNDROME
- Fragile X mental retardation is characterized by moderate to severe mental retardation, macroorchidism, and distinct facial features, including long face, large ears, and prominent jaw. In most cases, the disorder is caused by the unstable expansion of a CGG repeat in the FMR1 gene and abnormal methylation, which results in suppression of FMR1 transcription and decreased protein levels in the brain (Devys et al., 1993).
