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2017 ; 19
(8
): 1532-1544
Nephropedia Template TP
gab.com Text
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English Wikipedia
Schizophrenia-Related Microdeletion Impairs Emotional Memory through
MicroRNA-Dependent Disruption of Thalamic Inputs to the Amygdala
#MMPMID28538174
Eom TY
; Bayazitov IT
; Anderson K
; Yu J
; Zakharenko SS
Cell Rep
2017[May]; 19
(8
): 1532-1544
PMID28538174
show ga
Individuals with 22q11.2 deletion syndrome (22q11DS) are at high risk of
developing psychiatric diseases such as schizophrenia. Individuals with 22q11DS
and schizophrenia are impaired in emotional memory, anticipating, recalling, and
assigning a correct context to emotions. The neuronal circuits responsible for
these emotional memory deficits are unknown. Here, we show that 22q11DS mouse
models have disrupted synaptic transmission at thalamic inputs to the lateral
amygdala (thalamo-LA projections). This synaptic deficit is caused by
haploinsufficiency of the 22q11DS gene Dgcr8, which is involved in microRNA
processing, and is mediated by the increased dopamine receptor Drd2 levels in the
thalamus and by reduced probability of glutamate release from thalamic inputs.
This deficit in thalamo-LA synaptic transmission is sufficient to cause fear
memory deficits. Our results suggest that dysregulation of the Dgcr8-Drd2
mechanism at thalamic inputs to the amygdala underlies emotional memory deficits
in 22q11DS.