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The minimal gap-junction network among melanophores and xanthophores required for stripe pattern formation in zebrafish.

Development. 2019 Nov 15;146(22)
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摘要


Connexin 39.4 (Cx39.4) and connexin 41.8 (Cx41.8), two gap-junction proteins expressed in both melanophores and xanthophores, are crucial for the intercellular communication among pigment cells that is necessary for generating the stripe pigment pattern of zebrafish. We have previously characterized the gap-junction properties of Cx39.4 and Cx41.8, but how these proteins contribute to stripe formation remains unclear; this is because distinct types of connexins potentially form heteromeric gap junctions, which precludes accurate elucidation of individual connexin functions in vivo Here, by arranging Cx39.4 and Cx41.8 expression in pigment cells, we have identified the simplest gap-junction network required for stripe generation: Cx39.4 expression in melanophores is required but expression in xanthophores is not necessary for stripe patterning, whereas Cx41.8 expression in xanthophores is sufficient for the patterning, and Cx41.8 expression in melanophores might stabilize the stripes. Moreover, patch-clamp recordings revealed that Cx39.4 gap junctions exhibit spermidine-dependent rectification property. Our results suggest that Cx39.4 facilitates the crucial cell-cell interactions between melanophores and xanthophores that mediate a unidirectional activation-signal transfer from xanthophores to melanophores, which is essential for melanophore survival.

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