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2015 ; 87
(6
): 1261-1273
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Stochastic Interaction between Neural Activity and Molecular Cues in the
Formation of Topographic Maps
#MMPMID26402608
Owens MT
; Feldheim DA
; Stryker MP
; Triplett JW
Neuron
2015[Sep]; 87
(6
): 1261-1273
PMID26402608
show ga
Topographic maps in visual processing areas maintain the spatial order of the
visual world. Molecular cues and neuronal activity both play critical roles in
map formation, but their interaction remains unclear. Here, we demonstrate that
when molecular- and activity-dependent cues are rendered nearly equal in force,
they drive topographic mapping stochastically. The functional and anatomical
representation of azimuth in the superior colliculus of heterozygous Islet2-EphA3
knockin (Isl2(EphA3/+)) mice is variable: maps may be single, duplicated, or a
combination of the two. This heterogeneity is not due to genetic differences,
since map organizations in individual mutant animals often differ between
colliculi. Disruption of spontaneous waves of retinal activity resulted in
uniform map organization in Isl2(EphA3/+) mice, demonstrating that correlated
spontaneous activity is required for map heterogeneity. Computational modeling
replicates this heterogeneity, revealing that molecular- and activity-dependent
forces interact simultaneously and stochastically during topographic map
formation.