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Functional constraints on SoxE proteins in neural crest development: The importance of differential expression for evolution of protein activity

机译:SoxE蛋白质在神经c发育中的功能限制:差异表达对蛋白质活性进化的重要性

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VertebrateSoxEgenes(emSox8/em,em9/em,andem10/em)arekeyregulatorsofneuralcrestcell(NCC)development.ThesegenesarosebyduplicationfromasingleSoxEgeneinthevertebrateancestor.AlthoughSoxEparalogsarecoexpressedearlyinNCCdevelopment,later,emSox9/emisrestrictedtoskeletogeniclineagesinthehead,andemSox10/emtonon-skeletogenicNCCinthetrunkandhead.Whenthissubfunctionalizationevolvedanditspossibleroleintheevolutionoftheneuralcrestareunknown.SealampreysarebasalvertebratesthatalsopossessthreeSoxEgenes,whileonlyasingleSoxEispresentinthecephalochordateamphioxus.InordertoaddressthefunctionaldivergenceofSoxEgenes,andtodetermineifdifferencesintheirbiochemicalfunctionsmaybelinkedtochangesinneuralcrestdevelopmentalpotential,weexaminedtheabilityoflampreyandamphioxusSoxEgenestoregulatedifferentiationofNCCderivativesinzebrafishemcolourless/em(emcls/em)mutantslackingexpressionofemsox10/em.Ourfindingssuggestthattheproto-vertebrateemSoxE/emgenepossessedbothmelanogenicandneurogeniccapabilitiespriortoSoxEgeneduplication.Followingtheagnathan-gnathostomesplit,lampreyemSoxE1/emandemSoxE3/emlargelylosttheirmelanogenicand/orentericneurogenicproperties,whilegnathostomeSoxEparalogshaveretainedfunctionalconservation.WepositthatthisdifferenceinproteinsubfunctionalizationisadirectconsequenceoftheindependentregulationofSoxEparalogexpressionbetweenthetwolineages.Specifically,weproposethattheoverlappingexpressionofgnathostomeSoxEparalogsinearlyneuralcrestlargelyconstrainedthefunctionofgnathostomeSoxEproteins.Incontrast,thelargelynon-overlappingexpressionoflampreySoxEparalogsallowedthemtospecializewithregardtotheirDNA-bindingand/orproteininteractionproperties.RestrictionofdevelopmentalpotentialamongcranialandtrunkneuralcrestinlampreysmayberelatedtoconstraintsonSoxEactivityamongduplicates,butsuchspecializationdoesnotappeartohaveoccurredingnathostomes.ThishighlightsanimportantdifferenceintheevolutionofSoxEactivitybetweenthesetwodivergentvertebratelineagesandprovidesinsightsforunderstandinghowcellfaterestrictionindifferentNCCpopulationsmaybedependentonsubfunctionalizationamongSoxEduplicates./p/div
机译:VertebrateSoxEgenes( Sox8 9 10 )是神经(细胞(NCC)发展的关键调节器。 isrestrictedtoskeletogeniclineagesinthehead和 SOX10 的TONON-skeletogenicNCCinthetrunkandhead.Whenthissubfunctionalizationevolvedanditspossibleroleintheevolutionoftheneuralcrestareunknown.SealampreysarebasalvertebratesthatalsopossessthreeSoxEgenes,whileonlyasingleSoxEispresentinthecephalochordateamphioxus.InordertoaddressthefunctionaldivergenceofSoxEgenes,andtodetermineifdifferencesintheirbiochemicalfunctionsmaybelinkedtochangesinneuralcrestdevelopmentalpotential,weexaminedtheabilityoflampreyandamphioxusSoxEgenestoregulatedifferentiationofNCCderivativesinzebrafish <位置>无色的(<在>顺的)mutantslackingexpressionof <位置> SOX10 < / em>。我们的发现建议,原始脊椎动物 SoxE 基因可能具有黑素生成和中性生成ccapabilitiespriortoSoxEgeneduplication.Followingtheagnathan-gnathostomesplit,八目鳗<位置> SoxE1 SoxE3 的largelylosttheirmelanogenicand / orentericneurogenicproperties,whilegnathostomeSoxEparalogshaveretainedfunctionalconservation.WepositthatthisdifferenceinproteinsubfunctionalizationisadirectconsequenceoftheindependentregulationofSoxEparalogexpressionbetweenthetwolineages.Specifically,weproposethattheoverlappingexpressionofgnathostomeSoxEparalogsinearlyneuralcrestlargelyconstrainedthefunctionofgnathostomeSoxEproteins.Incontrast,thelargelynon-overlappingexpressionoflampreySoxEparalogsallowedthemtospecializewithregardtotheirDNA-bindingand / orproteininteractionproperties.RestrictionofdevelopmentalpotentialamongcranialandtrunkneuralcrestinlampreysmayberelatedtoconstraintsonSoxEactivityamongduplicates,butsuchspecializationdoesnotappeartohaveoccurredingnathostomes。这两个不同的脊椎动物世系之间的Sox活性演变有着重要的区别,并提供了ghts了解不同NCC种群的细胞命运限制可能取决于Sox重复项中的亚功能化。

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