Hypothalamic Pituitary Adrenal (HPA) Axis Dysregulation in Fragile X Syndrome

Carolyn-Beebe-Smith

The hypothalamic pituitary adrenal (HPA) axis is our central stress response system. FRAXA Research Foundation awarded Dr. Carolyn B. Smith $62,000 in funding in 2005 to explore the HPA axis in Fragile X mice. The results of their study indicate that, in FVB/NJ mice, the hormonal response to and recovery from acute stress is unaltered by the lack of Fragile X mental retardation protein. Results published.

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Defining Functional Domains of FMRP and Uncovering its Partners via Large Scale Mutagenesis in Drosophila

Yong Zhang, PhD, at Chinese Academy of Sciences, FRAXA research grant

With $80,000 in funding from FRAXA Research Foundation in 2005 and in 2006, Dr. Yong Zhang and his team at the Chinese Academy of Sciences developed a way to find genes that suppress the Fragile X gene. FRAXA grants $40,000 (2006) and $40,000 (2005) by Xinda Lin show that FMRP is a widely expressed RNA-binding protein involved in RNA transport and translation. Intensive studies in the last decade have demonstrated that FMRP contains four RNA binding domains, but their actual functions are mostly untested. Meanwhile, a dozen or so protein partners and hundreds of mRNA targets interacting with FMRP have been identified, but again their functions are poorly understood.

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Fragile X Syndrome and RNAi

With a $75,000 grant from FRAXA Research Foundation from 2003-2004, Dr. Richard Carthew and his team at Northwestern University studied their interest in gene expression by investigating the role of the recently discovered process of interfering RNA (RNAi). FMRP appears to be involved in the metabolism of RNAi, and may have a role in regulating the process; likewise, deficits in RNAi may contribute to the disease process in Fragile X.

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