Trappc9 deficiency causes parent-of-origin dependent microcephaly and obesity.

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 Genet

journal_title

PLoS genetics

authors

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 DW

doi

10.1371/journal.pgen.1008916

subject

Has Abstract

pub_date

2020-09-02 00:00:00

pages

e1008916

issue

9

eissn

1553-7390

issn

1553-7404

pii

PGENETICS-D-20-00063

journal_volume

16

pub_type

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