Abstract:
:Some imprinted genes exhibit parental origin specific expression bias rather than being transcribed exclusively from one copy. The physiological relevance of this remains poorly understood. In an analysis of brain-specific allele-biased expression, we identified that Trappc9, a cellular trafficking factor, was expressed predominantly (~70%) from the maternally inherited allele. Loss-of-function mutations in human TRAPPC9 cause a rare neurodevelopmental syndrome characterized by microcephaly and obesity. By studying Trappc9 null mice we discovered that homozygous mutant mice showed a reduction in brain size, exploratory activity and social memory, as well as a marked increase in body weight. A role for Trappc9 in energy balance was further supported by increased ad libitum food intake in a child with TRAPPC9 deficiency. Strikingly, heterozygous mice lacking the maternal allele (70% reduced expression) had pathology similar to homozygous mutants, whereas mice lacking the paternal allele (30% reduction) were phenotypically normal. Taken together, we conclude that Trappc9 deficient mice recapitulate key pathological features of TRAPPC9 mutations in humans and identify a role for Trappc9 and its imprinting in controlling brain development and metabolism.
journal_name
PLoS Genetjournal_title
PLoS geneticsauthors
Liang ZS,Cimino I,Yalcin B,Raghupathy N,Vancollie VE,Ibarra-Soria X,Firth HV,Rimmington D,Farooqi IS,Lelliott CJ,Munger SC,O'Rahilly S,Ferguson-Smith AC,Coll AP,Logan DWdoi
10.1371/journal.pgen.1008916subject
Has Abstractpub_date
2020-09-02 00:00:00pages
e1008916issue
9eissn
1553-7390issn
1553-7404pii
PGENETICS-D-20-00063journal_volume
16pub_type
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