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Chan, E.Y. et al.

Targeted disruption of Huntingtin-associated protein-1 (Hap1) results in postnatal death due to depressed feeding behavior.

HAP-1 is a huntingtin-associated protein that is enriched in the brain. To gain insight into the normal physiological role of HAP-1, mice were generated with homozygous disruption at the Hap1 locus. Loss of HAP-1 expression did not alter the gross brain expression levels of its interacting partners, huntingtin and p150glued. Newborn Hap1(-/-) animals are observed at the expected Mendelian frequency suggesting a non-essential role of HAP-1 during embryogenesis. Postnatally, Hap1(-/-) pups show decreased feeding behavior that ultimately leads to malnutrition, dehydration and premature death. Seventy percent of Hap1(-/-) pups fail to survive past the second postnatal day (P2) and 100% of Hap1(-/-) pups fail to survive past P9. From P2 until death, Hap1(-/-) pups show markedly decreased amounts of ingested milk. Hap1(-/-) pups that survive to P8 show signs of starvation including greatly decreased serum leptin levels, decreased brain weight and atrophy of the brain cortical mantel. HAP-1 is particularly enriched in the hypothalamus, which is well documented to regulate feeding behavior. Our results demonstrate that HAP-1 plays an essential role in regulating postnatal feeding.[1]

References

Targeted disruption of Huntingtin-associated protein-1 (Hap1) results in postnatal death due to depressed feeding behavior. Chan, E.Y., Nasir, J., Gutekunst, C.A., Coleman, S., Maclean, A., Maas, A., Metzler, M., Gertsenstein, M., Ross, C.A., Nagy, A., Hayden, M.R. Hum. Mol. Genet. (2002) [Pubmed]

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