Cytochemical studies on the protamine-type protein transition in sperm nuclei after fertilization and the early embryonic histones of Urechis caupo☆
[摘要] CytochemicalstainingcharacteristicsofnuclearhistonesduringpostfertilizationmaturationdivisionandvariousearlyembryonicstagesinUrechishavebeenstudied.Thetransitionofprotamine-typeproteintoadulthistonesinthespermnucleusisaccomplishedby15minafterentranceintotheeggcytoplasm.Newlysynthesizedeggproteinsmigrateintoenlargingmaleandfemalepronucleiafterthistransition,followedbypronuclearDNAsynthesisandfusion.Theshiftfromprotamine-typeproteintoadulthistones,whichoccursintheabsenceofRNAsynthesisduringthepostfertilizationmaturationdivisionoftheegg,maybeoneoftheprocessesinvolvedinthenormalstructuralreorganizationofchromosomes.Suchareorganizationislikelytobeaprerequisiteforchromosomereplicationandmitosis.Noqualitativedifferencesaredetectedinthestainabilityofhistonesofunfertilizedeggsandembryosatthecleavageandlaterstagesofdevelopment.
[发布日期] [发布机构]
[效力级别] [学科分类] 生物科学（综合）
[关键词] [时效性]
