Modifier genes for mouse phosphatidylinositol transfer protein a (vibrator) that bypass juvenile lethality

Dorothy Concepcion, Frank Johannes, Yuan Hung Lo, Jay Yao, Jerry Fong, Bruce A. Hamilton

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Phosphatidylinositol transfer proteins (PITPs) mediate lipid signaling and membrane trafficking in eukaryotic cells. Loss-of-function mutations of the gene encoding PITPa in mice result in a range of dosage sensitive phenotypes, including neurological dysfunction, neuro degeneration, and premature death. We have previously reported genetic suppression of a strong hypomorphic allele, vibrator, by a wild-derived variant of Nxf1, which increases the level of PITPα made from vibrator alleles and suppresses each of the neurological and survival phenotypes. Here we report discovery and genetic mapping of additional vibrator modifiers, Mvb2 and Mvb3, from a different strain background that suppresses juvenile lethality without suppressing visible phenotypes or gene expression. Genotype-specific survival analysis predicts molecular heterosis at Mvb3. These results indicate a mechanism of suppression that bypasses a quantitative requirement for PITPa function.

Original languageEnglish
Pages (from-to)1185-1191
Number of pages7
JournalGenetics
Volume187
Issue number4
DOIs
StatePublished - Apr 2011
Externally publishedYes

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