ويؤيد الأمين العام بأموال من جامعة ولاية نيويورك في بوفالو من مؤسسة جون وOishei ر.

1. إعداد الكواشف <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> إعداد 1X الاحتياطي تشريح باستخدام كلوريد الصوديوم 128 ملم ، 4mM CaCl 2 ، 4mM MgCl 2 ، 2 مم بوكل ، HEPES 5mM والسكروز 36mM. PH 7.2 الحل لتعقيم وتصفية. </li><li style=";text-align:right;direction:rtl"> إعداد مثبت باستخدام 01:01 التخفيف من الفورمالديهايد بنسبة 16 ٪ والاحتياطي 1X تشريح. </li><li style=";text-align:right;direction:rtl"> إعداد 1X PBT باستخدام الفوسفات 1X التخزين المؤقت المالحة (PBS) في PH من 7.2 و تريتون X - 100 في نسبة 1:100. </li><li style=";text-align:right;direction:rtl"> تحضير 5 ٪ مصل الزلال البقري (BSA) مع 0.01 ٪ في برنامج تلفزيوني نا آزيد 1X. </li></ol> 2. التحضير للتشريح <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> يتم استخدام أطباق Sylgard لتشريح. إعداد أطباق بصب Sylgard الاستومر سيليكون 184 قاعدة وعلاج خليط عامل في طبق بتري. يسمح هذا المزيج على ترسيخ وجافة تماما قبل استخدامها. </li><li style=";text-align:right;direction:rtl"> قبل التشريح ، وجمع الزوج نظيف # 5 ملقط ، زوج مستقيم نظيف شفرة المقص vannas ، والدبابيس. </li></ol> 3. تشريح 3 اليرقات طور مرحلي الثالثة <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> جمع اليرقات طور مرحلي يتجول 3 الثالثة من النمط الجيني محددة على طبق بتري. </li><li style=";text-align:right;direction:rtl"> غسل اليرقات في الماء منزوع الأيونات للتخلص من المواد الغذائية. </li><li style=";text-align:right;direction:rtl"> مكان اليرقة على طبق sylgard ، حتى مع الجانب الظهري. دبوس اليرقة في غاياتها الأمامي والخلفي. </li><li style=";text-align:right;direction:rtl"> وضع قطرة من الاحتياطي تشريح 1X على يرقة دبس. باستخدام مقص غرامة ارتشف اليرقة على خط الوسط الظهرية قرب نهاية الخلفي. باستخدام مقص ، قص إهاب اليرقات من نهاية الخلفي حتى النهاية الأمامية. </li><li style=";text-align:right;direction:rtl"> وضع قطرة من جديد الاحتياطي تشريح 1X على اليرقة تشريح. باستخدام دبوس ، واختيار واحد من الحافة الجانبية للبشرة بالقرب من وسط اليرقة ويعلقون عليه إهاب. باستخدام آخر دبوس ، دبوس على حافة second الجانبي للبشرة كما هو موضح في الرسم التخطيطي. وتستخدم اثنين من المسامير على كل جانب الوحشي. انظر الرسم البياني أدناه. </li><li style=";text-align:right;direction:rtl"> إزالة بعناية للأمعاء ، والهيئات الدهون ، والقصبة الهوائية ، ولم يتبق سوى الدماغ مع فصين اثنين البصرية والعقد البطنية مع الأعصاب قطعي المرفقة. انجاز ما تبقى من النظام الداخلي في صحن sylgard. </li></ol> 4. تثبيت للتشريح اليرقة <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> احتضان اليرقة تشريح في الإصلاح لمدة 30 دقيقة ، عن طريق استبدال الإصلاح كل 15 دقيقة. </li><li style=";text-align:right;direction:rtl"> بعد التثبيت ، شطف يرقة في PBT 1X لمدة 30 دقيقة عن طريق استبدال العازلة كل 10 دقائق. ومن المهم أن نلاحظ أن اليرقة ينبغي أن يكون دائما في المخزن. </li></ol> 5. يلطخ الضد من اليرقة تشريح <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> إعداد الأجسام المضادة الأولية عن طريق تمييع لتركيز مناسبة في جيش صرب البوسنة 5 ٪ مع آزيد نا في PBT 1X. وسوف تختلف تركيزات الأمثل لأجسام مضادة مختلفة. </li><li style=";text-align:right;direction:rtl"> استبدال PBT مشاركة 1X شطف مع الحل الضد الأولية المعدة واحتضان في حجرة رطبة عند 4 درجات مئوية خلال الليل. هي التي شيدت من قبل الغرفة الرطبة المبطنة طبق من البلاستيك مع كيم مناديل المنقوعة في الماء. </li><li style=";text-align:right;direction:rtl"> في اليوم التالي ، شطف يرقة في تشريح PBT 1X لمدة 30 دقيقة عن طريق استبدال العازلة كل 10 دقائق. </li><li style=";text-align:right;direction:rtl"> إعداد الأجسام المضادة الثانوية إلى تمييع التركيز المناسب في جيش صرب البوسنة 5 ٪ مع آزيد نا في PBT 1X ، واحتضان اليرقة مع الحل القائم على الأجسام المضادة الثانوية في 25 درجة مئوية لمدة ساعة. التفاف الغرفة الرطبة في احباط لمنع الخفيفة ، والأجسام المضادة الثانوية خفيفة حساسة. </li><li style=";text-align:right;direction:rtl"> بعد الحضانة ، شطف يرقة في PBT 1X لمدة 30 دقيقة عن طريق استبدال العازلة كل 10 دقائق. </li></ol> 6. تصاعد والتخيل للتشريح اليرقة <ol style=";text-align:right;direction:rtl"><li style=";text-align:right;direction:rtl"> قبل التركيب اليرقة على الشريحة ، وإعداد الشريحة من خلال نشر سطرين العمودي طلاء الأظافر في الوسط ، مع مساحة كافية لتغطية زلة على الجلوس على (انظر الرسم البياني). السماح للطلاء الأظافر جافة تماما. </li><li style=";text-align:right;direction:rtl"> وضع قطرة العازلة تصاعد في الفضاء بين خطوط عمودية تلميع الأظافر على الشريحة (انظر الرسم البياني). الشريحة الآن جاهزة للتركيب. <img src="/files/ftp_upload/2128/2128.6.2.1.jpg" alt="الشكل 1 الخطوة 6.2" /> <img src="/files/ftp_upload/2128/2128.6.2.2.jpg" alt="الشكل 2 الخطوة 6.2" /></li><li style=";text-align:right;direction:rtl"> بعد شطف مشاركة 1X PBT ، إزالة بلطف دبابيس الجانبية. كن حذرا حتى لا تمزق بشرة. </li><li style=";text-align:right;direction:rtl"> إزالة المسامير بعناية المتبقيتين والتقاط اليرقة مع ملقط ومكان اليرقة أفقيا على الشريحة المعدة. تأكد من عدم اليرقة انقلبت والجانب البطني المنحى يصل. </li><li style=";text-align:right;direction:rtl"> المكان بلطف زلة غطاء على رأس وختم حواف مع طلاء الأظافر (انظر الرسم البياني). اليرقة هي الآن جاهزة للتصوير تحت المجهر الفلورسنت. <img src="/files/ftp_upload/2128/2128.6.5.jpg" alt="الشكل 1 الخطوة 6.5" /></li></ol> 7. ممثل النتائج <img src="/files/ftp_upload/2128/2128fig1.jpg" alt="الشكل 1" /> الشكل 1 : صورة ممثل الأعصاب قطعي اليرقات من نوع larv البريةa باستخدام أجسام مضادة ضد بروتين حويصلة متشابك بروتين سلسلة السيستين (CSP ، Zinsmaier آخرون 1994). علما بأن الأعصاب قطعي ملطخة بسلاسة. = شريط 20μm <img src="/files/ftp_upload/2128/2128fig2.jpg" alt="الشكل 2" /> الشكل 2 : صورة ممثل الأعصاب قطعي اليرقات من البروتين السيارات الطافرة اليرقة باستخدام أجسام مضادة ضد بروتين حويصلة متشابك بروتين سلسلة السيستين (CSP). علما بأن الأعصاب قطعي التراكمات الهائلة التي تظهر بقع براقة لCSP (الأسهم).

<ol>
	<li>Gunawardena, S., Goldstein, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Disruption+of+Axonal+Transport+and+Neuronal+Viability+by+Amyoid+Precursor+Protein+Mutations+in+Drosophila.">Disruption of Axonal Transport and Neuronal Viability by Amyoid Precursor Protein Mutations in Drosophila.</a> Neuron. 32 (2), 389-401 (2001).</li><li>Gunawardena, S., Her, L. S., Brusch, R. G., Laymon, R. A., Niesman, I. R., Gordesky-Gold, B., Sintasath, L., Bonini, N. M., Goldstein, L. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Disruption+of+axonal+transport+by+loss+of+huntingtin+or+expression+of+pathogenic+polyQ+proteins+in+Drosophila.">Disruption of axonal transport by loss of huntingtin or expression of pathogenic polyQ proteins in Drosophila.</a> Neuron. 40 (1), 1-2 (2003).</li><li>Hurd, D. D., Saxton, W. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Kinesin+mutations+cause+motor+neuron+disease+phenotypes+by+disrupting+fast+axonal+transport+in+Drosophila.">Kinesin mutations cause motor neuron disease phenotypes by disrupting fast axonal transport in Drosophila.</a> Genetics. 144 (3), 1075-1085 (1996).</li><li>Zinsmaier, K. E., Eberle, K. K., Buchner, E., Walter, N., Benzer, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Paralysis+and+early+death+in+cysteine+string+protein+mutants+of+Drosophila.">Paralysis and early death in cysteine string protein mutants of Drosophila.</a> Science. 263, 977-980 (1994).</li></ol>

الإعلان عن أي تضارب في المصالح.

ويرقات ذبابة الفاكهة الأعصاب قطعي وجود نظام قوي لدراسة آليات النقل في محواري. إذا أجري تشريح الثالثة 3 اليرقات طور مرحلي بشكل صحيح ، يمكن النظر في جميع مكونات الجهاز العصبي المركزي ، الجهاز العصبي المحيطي ، والأنسجة المرتبطة بها ، مثل العضلات وNMJs ، داخل يرقة واحدة. وقد تكيفت نحن من هذا البروتوكول واحدة نشرتها هيرد وساكستون (1996). ويمكن أيضا هذا البروتوكول يمكن تكييفها لاختبار الأجسام المضادة الخلايا العصبية الأخرى ، ولكن ينبغي أن يتم الاستفادة المثلى من الأجسام المضادة. يمكن تغيير الحضانة الضد الابتدائي والثانوي مرات أو يمكن إضافة خطوة الحجب. وقد استخدمنا بنجاح هذا البروتوكول للتحقيق في دور بروتين اميلويد السلائف 1 و 2 في مجال النقل Huntingtin محواري.

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visualization of larval segmental nerves in 3rd instar drosophila larval preparations

ذبابة الفاكهة السوداء البطن في الظهور كنظام نموذج قوية لدراسة تطوير وظيفة من وظائف الجهاز العصبي ، وخصوصا بسبب الوراثة لها مريحة وتسلسل الجينوم الكامل. بالإضافة إلى ذلك ، فإن النظام العصبي اليرقات هو نظام نموذج مثالي لدراسة آليات النقل محواري كما تحتوي على أعصاب اليرقات قطعي حزم من المحاور مع الهيئات التي تقع داخل الخلية على المخ والأعصاب الطرفية التي تنتهي على طول الجسم. نحن هنا وصف الإجراء لرؤية البروتينات حويصلة متشابك داخل الأعصاب قطعي اليرقات. إذا فعلت بشكل صحيح ، وجميع مكونات الجهاز العصبي ، جنبا إلى جنب مع أنسجة المرتبطة بها مثل العضلات وNMJs ، ما زالت سليمة ، سليمة ، وجاهزة للتصور. يتم تشريح 3 اليرقات طور مرحلي الثالثة تحمل طفرات مختلفة ، الثابتة ، وحضنت مع الأضداد حويصلة متشابك ، وتصور بالمقارنة مع نوع اليرقات البرية. ويمكن تكييف هذا الإجراء لعدة أجسام مختلفة متشابك أو العصبية والتغيرات في توزيع مجموعة متنوعة من البروتينات يمكن ملاحظتها بسهولة داخل الأعصاب قطعي اليرقات.

Watch this Scientific Journal Video about Visualization of Larval Segmental Nerves in 3rd Instar Drosophila Larval Preparations at JoVE.com

Visualization of Larval Segmental Nerves in 3rd Instar Drosophila Larval Preparations

يرقات ذبابة الفاكهة السوداء البطن توفير نظام النموذج المثالي للتحقيق في آليات النقل داخل محواري الأعصاب قطعي اليرقات. باستخدام هذا الإجراء ، يمكن مقارنة 3 اليرقات طور مرحلي الثالثة تحمل طفرات مختلفة ليرقات النوع البري.

تصور الأعصاب القطاعي اليرقات في 3 الثالثة طور مرحلي ذبابة الفاكهة التحضيرات اليرقات

Drosophila melanogaster is emerging as a powerful model system for studying the development and function of the nervous system, particularly because of ...

visualization-larval-segmental-nerves-3rd-instar-drosophila-larval

Nanyang Technological University

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JoVE Journal

Neuroscience

Visualization of Larval Segmental Nerves in 3rd Instar Drosophila Larval Preparations

10.3K Views.  SUNY-University at Buffalo. يرقات ذبابة الفاكهة السوداء البطن توفير نظام النموذج المثالي للتحقيق في آليات النقل داخل محواري الأعصاب قطعي اليرقات. باستخدام هذا الإجراء ، يمكن مقارنة 3 اليرقات طور مرحلي الثالثة تحمل طفرات مختلفة ليرقات النوع البري.

Video: Visualization of Larval Segmental Nerves in 3rd Instar Drosophila Larval Preparations

In vivo Visualization of Synaptic Vesicles Within Drosophila Larval Segmental Axons

Elucidating the mechanisms of axonal transport has shown to be very important in determining how defects in long distance transport affect different neurological diseases. Defects in this essential process can have detrimental effects on neuronal functioning and development. We have developed a dissection protocol that is designed to expose the Drosophila larval segmental nerves to view axonal transport in real time. We have adapted this protocol for live imaging from the one published by Hurd and Saxton (1996) used for immunolocalizatin of larval segmental nerves. Careful dissection and proper buffer conditions are critical for maximizing the lifespan of the dissected larvae. When properly done, dissected larvae have shown robust vesicle transport for 2-3 hours under physiological conditions. We use the UAS-GAL4 method 1 to express GFP-tagged APP or synaptotagmin vesicles within a single axon or many axons in larval segmental nerves by using different neuronal GAL4 drivers. Other fluorescently tagged markers, for example mitochrondria (MitoTracker) or lysosomes (LysoTracker), can be also applied to the larvae before viewing. GFP-vesicle movement and particle movement can be viewed simultaneously using separate wavelengths.

In vivo Visualization of Synaptic Vesicles Within Drosophila Larval Segmental Axons

This protocol discusses the live dissection of Drosophila larvae for the purpose of imaging the movement of GFP tagged axonal vesicles on microtubule tracks.

في التصور المجراة من الحويصلات متشابك ضمن محاور عصبية ذبابة الفاكهة القطاعي اليرقات

Elucidating the mechanisms of axonal transport has shown to be very important in determining how defects in long distance transport affect different ...

Mapping and Application of Enhancer-trap Flippase Expression in Larval and Adult Drosophila CNS

The Gal4/ UAS binary method is powerful for gene and neural circuitry manipulation in Drosophila. For most neurobiological studies, however, Gal4 expression is rarely tissue-specific enough to allow for precise correlation of the circuit with behavioral readouts. To overcome this major hurdle, we recently developed the FINGR method to achieve a more restrictive Gal4 expression in the tissue of interest. The FINGR method has three components: 1) the traditional Gal4/UAS system; 2) a set of FLP/FRT-mediated Gal80 converting tools; and 3) enhancer-trap FLP (ET-FLP). Gal4 is used to define the primary neural circuitry of interest. Paring the Gal4 with a UAS-effector, such as UAS-MJD78Q or UAS-Shits, regulates the neuronal activity, which is in turn manifested by alterations in the fly behavior. With an additional UAS-reporter such as UAS-GFP, the neural circuit involved in the specific behavior can be simultaneously mapped for morphological analysis. For Gal4 lines with broad expression, Gal4 expression can be restricted by using two complementary Gal80-converting tools: tubP&gt;Gal80&gt; ('flip out') and tubP&gt;stop&gt;Gal80 ('flip in'). Finally, investigators can turn Gal80 on or off, respectively, with the help of tissue-specific ET-FLP. In the flip-in mode, Gal80 will repress Gal4 expression wherever Gal4 and ET-FLP intersect. In the flip-out mode, Gal80 will relieve Gal4 repression in cells in which Gal4 and FLP overlap. Both approaches enable the restriction of the number of cells in the Gal4-defined circuitry, but in an inverse pattern. The FINGR method is compatible with the vast collection of Gal4 lines in the fly community and highly versatile for traditional clonal analysis and for neural circuit mapping. In this protocol, we demonstrate the mapping of FLP expression patterns in select ET-FLPx2 lines and the effectiveness of the FINGR method in photoreceptor cells. The principle of the FINGR method should also be applicable to other genetic model organisms in which Gal4/UAS, Gal80, and FLP/FRT are used.

Mapping and Application of Enhancer-trap Flippase Expression in Larval and Adult Drosophila CNS

We describe a Flippase-induced intersectional Gal80/Gal4 repression (FINGR) method, allowing tissue-specific FLP to determine Gal80 expression patterns. Wherever Gal4 and FLP overlap, Gal4 expression is turned on (Gal80 flipped out) or off (Gal80 flipped in). The FINGR method is versatile for clonal analysis and neural circuit mapping.

رسم الخرائط وتطبيق التعبير Flippase محسن شرك في اليرقات والكبار ذبابة الفاكهة CNS

The Gal4/ UAS binary method is powerful for gene and neural circuitry manipulation in Drosophila. For most neurobiological studies, however, Gal4 ...

Morphological Analysis of Drosophila Larval Peripheral Sensory Neuron Dendrites and Axons Using Genetic Mosaics

Nervous system development requires the correct specification of neuron position and identity, followed by accurate neuron class-specific dendritic development and axonal wiring. Recently the dendritic arborization (DA) sensory neurons of the Drosophila larval peripheral nervous system (PNS) have become powerful genetic models in which to elucidate both general and class-specific mechanisms of neuron differentiation.
There are four main DA neuron classes (I-IV)1. They are named in order of increasing dendrite arbor complexity, and have class-specific differences in the genetic control of their differentiation2-10. The DA sensory system is a practical model to investigate the molecular mechanisms behind the control of dendritic morphology11-13 because: 1) it can take advantage of the powerful genetic tools available in the fruit fly, 2) the DA neuron dendrite arbor spreads out in only 2 dimensions beneath an optically clear larval cuticle making it easy to visualize with high resolution in vivo, 3) the class-specific diversity in dendritic morphology facilitates a comparative analysis to find key elements controlling the formation of simple vs. highly branched dendritic trees, and 4) dendritic arbor stereotypical shapes of different DA neurons facilitate morphometric statistical analyses.
DA neuron activity modifies the output of a larval locomotion central pattern generator14-16. The different DA neuron classes have distinct sensory modalities, and their activation elicits different behavioral responses14,16-20. Furthermore different classes send axonal projections stereotypically into the Drosophila larval central nervous system in the ventral nerve cord (VNC)21. These projections terminate with topographic representations of both DA neuron sensory modality and the position in the body wall of the dendritic field7,22,23. Hence examination of DA axonal projections can be used to elucidate mechanisms underlying topographic mapping7,22,23, as well as the wiring of a simple circuit modulating larval locomotion14-17.
We present here a practical guide to generate and analyze genetic mosaics24 marking DA neurons via MARCM (Mosaic Analysis with a Repressible Cell Marker)1,10,25 and Flp-out22,26,27 techniques (summarized in Fig. 1).

Morphological Analysis of Drosophila Larval Peripheral Sensory Neuron Dendrites and Axons Using Genetic Mosaics

The dendritic arborization sensory neurons of the Drosophila larval peripheral nervous system are useful models to elucidate both general and neuron class-specific mechanisms of neuron differentiation. We present a practical guide to generate and analyze dendritic arborization neuron genetic mosaics.

تحليل الصرفي ذبابة الفاكهة اليرقات المحيطية الانشعابيات عصبون حسي والمحاوير استخدام الفسيفساء الوراثية

Nervous system development requires the correct specification of neuron position and identity, followed by accurate neuron class-specific dendritic ...

Dissection and Immunohistochemistry of Larval, Pupal and Adult Drosophila Retinas

The compound eye of Drosophila melanogaster consists of about 750 ommatidia (unit eyes). Each ommatidium is composed of about 20 cells, including lens-secreting cone cells, pigment cells, a bristle cell and eight photoreceptors (PRs) R1-R8 2. The PRs have specialized microvillar structures, the rhabdomeres, which contain light-sensitive pigments, the Rhodopsins (Rhs). The rhabdomeres of six PRs (R1-R6) form a trapezoid and contain Rh1 3 4. The rhabdomeres of R7 and R8 are positioned in tandem in the center of the trapezoid and share the same path of light. R7 and R8 PRs stochastically express different combinations of Rhs in two main subtypes5: In the 'p' subtype, Rh3 in pR7s is coupled with Rh5 in pR8s, whereas in the 'y' subtype, Rh4 in yR7s is associated with Rh6 in yR8s 6 7 8.
Early specification of PRs and development of ommatidia begins in the larval eye-antennal imaginal disc, a monolayer of epithelial cells. A wave of differentiation sweeps across the disc9 and initiates the assembly of undifferentiated cells into ommatidia10-11. The 'founder cell' R8 is specified first and recruits R1-6 and then R7 12-14. Subsequently, during pupal development, PR differentiation leads to extensive morphological changes 15, including rhabdomere formation, synaptogenesis and eventually rh expression.
In this protocol, we describe methods for retinal dissections and immunohistochemistry at three defined periods of retina development, which can be applied to address a variety of questions concerning retinal formation and developmental pathways. Here, we use these methods to visualize the stepwise PR differentiation at the single-cell level in whole mount larval, midpupal and adult retinas (Figure 1).

Dissection and Immunohistochemistry of Larval, Pupal and Adult Drosophila Retinas

The Drosophila retina is a crystal-like lattice composed of a small number of cell types that are generated in a stereotyped manner 1. Its amenability to sophisticated genetic analysis allows the study of complex developmental programs. This protocol describes dissections and immunohistochemistry of retinas at three discrete developmental stages, with a focus on photoreceptor differentiation.

تشريح والمناعية من اليرقات، العذراء وتعليم الكبار<em&gt; ذبابة الفاكهة</em&gt; شبكية العين

The compound eye of Drosophila melanogaster consists of about 750 ommatidia (unit eyes). Each ommatidium is composed of about 20 cells, including ...

Forebrain Electrophysiological Recording in Larval Zebrafish

Epilepsy affects nearly 3 million people in the United States and up to 50 million people worldwide. Defined as the occurrence of spontaneous unprovoked seizures, epilepsy can be acquired as a result of an insult to the brain or a genetic mutation. Efforts to model seizures in animals have primarily utilized acquired insults (convulsant drugs, stimulation or brain injury) and genetic manipulations (antisense knockdown, homologous recombination or transgenesis) in rodents. Zebrafish are a vertebrate model system1-3 that could provide a valuable alternative to rodent-based epilepsy research. Zebrafish are used extensively in the study of vertebrate genetics or development, exhibit a high degree of genetic similarity to mammals and express homologs for ~85% of known human single-gene epilepsy mutations. Because of their small size (4-6 mm in length), zebrafish larvae can be maintained in fluid volumes as low as 100 &mu;l during early development and arrayed in multi-well plates. Reagents can be added directly to the solution in which embryos develop, simplifying drug administration and enabling rapid in vivo screening of test compounds4. Synthetic oligonucleotides (morpholinos), mutagenesis, zinc finger nuclease and transgenic approaches can be used to rapidly generate gene knockdown or mutation in zebrafish5-7. These properties afford zebrafish studies an unprecedented statistical power analysis advantage over rodents in the study of neurological disorders such as epilepsy. Because the "gold standard" for epilepsy research is to monitor and analyze the abnormal electrical discharges that originate in a central brain structure (i.e., seizures), a method to efficiently record brain activity in larval zebrafish is described here. This method is an adaptation of conventional extracellular recording techniques and allows for stable long-term monitoring of brain activity in intact zebrafish larvae. Sample recordings are shown for acute seizures induced by bath application of convulsant drugs and spontaneous seizures recorded in a genetically modified fish.

A simple method to record extracellular field potentials in the larval zebrafish forebrain is described. The method provides a robust in vivo read-out of seizure-like activity. This technique can be used with genetically modified zebrafish larvae carrying epilepsy-related genes or seizures evoked by administration of convulsant drugs.

الدماغ الأمامي تسجيل الكهربية في الزرد اليرقات

Epilepsy affects nearly 3 million people in the United States and up to 50 million people worldwide. Defined as the occurrence of spontaneous unprovoked ...

Functional Analysis of the Larval Feeding Circuit in Drosophila

The serotonergic feeding circuit in Drosophila melanogaster larvae can be used to investigate neuronal substrates of critical importance during the development of the circuit. Using the functional output of the circuit, feeding, changes in the neuronal architecture of the stomatogastric system can be visualized. Feeding behavior can be recorded by observing the rate of retraction of the mouth hooks, which receive innervation from the brain. Locomotor behavior is used as a physiological control for feeding, since larvae use their mouth hooks to traverse across an agar substrate. Changes in feeding behavior can be correlated with the axonal architecture of the neurites innervating the gut. Using immunohistochemistry it is possible to visualize and quantitate these changes. Improper handling of the larvae during behavior paradigms can alter data as they are very sensitive to manipulations. Proper imaging of the neurite architecture innervating the gut is critical for precise quantitation of number and size of varicosities as well as the extent of branch nodes. Analysis of most circuits allow only for visualization of neurite architecture or behavioral effects; however, this model allows one to correlate the functional output of the circuit with the impairments in neuronal architecture.

Functional Analysis of the Larval Feeding Circuit in Drosophila

The feeding circuit in Drosophila melanogaster larvae serves a simple yet powerful model that allows changes in feeding rate to be correlated with alterations in the stomatogastric neural circuitry. This circuit is composed of central serotonergic neurons that send projections to the mouth hooks as well as the foregut.

التحليل الوظيفي للتغذية اليرقات الدائرة في ذبابة الفاكهة</i

The serotonergic  feeding circuit in Drosophila  melanogaster larvae can be used to investigate neuronal substrates of  critical importance during the ...

Spinal Cord Transection in the Larval Zebrafish

Mammals fail in sensory and motor recovery following spinal cord injury due to lack of axonal regrowth below the level of injury as well as an inability to reinitiate spinal neurogenesis. However, some anamniotes including the zebrafish Danio rerio exhibit both sensory and functional recovery even after complete transection of the spinal cord. The adult zebrafish is an established model organism for studying regeneration following spinal cord injury, with sensory and motor recovery by 6&#160;weeks post-injury. To take advantage of in vivo analysis of the regenerative process available in the transparent larval zebrafish as well as genetic tools not accessible in the adult, we use the larval zebrafish to study regeneration after spinal cord transection. Here we demonstrate a method for reproducibly and verifiably transecting the larval spinal cord. After transection, our data shows sensory recovery beginning at 2&#160;days post-injury (dpi), with the C-bend movement detectable by 3 dpi and resumption of free swimming by 5 dpi. Thus we propose the larval zebrafish as a companion tool to the adult zebrafish for the study of recovery after spinal cord injury.

After spinal transection, adult zebrafish have functional recovery by six weeks post-injury. To take advantage of larval transparency and faster recovery, we present a method for transecting the larval spinal cord. After transection, we observe sensory recovery beginning at 2&#160;days post-injury, and C-bend movement by 3 days post-injury.

Transection الحبل الشوكي في اليرقات الزرد

Mammals fail in sensory and motor recovery following spinal cord injury due to lack of axonal regrowth below the level of injury as well as an inability ...

Live Imaging of Drosophila Larval Neuroblasts

Stem cells divide asymmetrically to generate two progeny cells with unequal fate potential: a self-renewing stem cell and a differentiating cell. Given their relevance to development and disease, understanding the mechanisms that govern asymmetric stem cell division has been a robust area of study. Because they are genetically tractable and undergo successive rounds of cell division about once every hour, the stem cells of the Drosophila central nervous system, or neuroblasts, are indispensable models for the study of stem cell division. About 100 neural stem cells are located near the surface of each of the two larval brain lobes, making this model system particularly useful for live imaging microscopy studies. In this work, we review several approaches widely used to visualize stem cell divisions, and we address the relative advantages and disadvantages of those techniques that employ dissociated versus intact brain tissues. We also detail our simplified protocol used to explant whole brains from third instar larvae for live cell imaging and fixed analysis applications.

Live Imaging of Drosophila Larval Neuroblasts

This protocol details a streamlined method used to conduct live cell imaging in the context of an intact larval brain. Live cell imaging approaches are invaluable for the study of asymmetric neural stem cell divisions as well as other neurogenic and developmental processes, consistently uncovering mechanisms that were previously overlooked.

التصوير المباشر ل<em&gt; ذبابة الفاكهة</em&gt; اليرقات Neuroblasts

Stem cells divide asymmetrically to generate two progeny cells with unequal fate potential: a self-renewing stem cell and a differentiating cell. Given ...

Why Quantification Matters: Characterization of Phenotypes at the Drosophila Larval Neuromuscular Junction

Most studies on morphogenesis rely on qualitative descriptions of how anatomical traits are affected by the disruption of specific genes and genetic pathways. Quantitative descriptions are rarely performed, although genetic manipulations produce a range of phenotypic effects and variations are observed even among individuals within control groups.&#160;Emerging evidence shows that morphology, size and location of organelles play a previously underappreciated, yet fundamental role in cell function and survival. Here we provide step-by-step instructions for performing quantitative analyses of phenotypes at the Drosophila larval neuromuscular junction (NMJ). We use several reliable immuno-histochemical markers combined with bio-imaging techniques and morphometric analyses to examine the effects of genetic mutations on specific cellular processes. In particular, we focus on the quantitative analysis of phenotypes affecting morphology, size and position of nuclei within the striated muscles of Drosophila larvae. The Drosophila larval NMJ is a valuable experimental model to investigate the molecular mechanisms underlying the structure and the function of the neuromuscular system, both in health and disease. However, the methodologies we describe here can be extended to other systems as well.

Why Quantification Matters: Characterization of Phenotypes at the Drosophila Larval Neuromuscular Junction

Morphology, size and location of intracellular organelles are evolutionarily conserved and appear to directly affect their function. Understanding the molecular mechanisms underlying these processes has become an important goal of modern biology. Here we show how these studies can be facilitated by the application of quantitative techniques.

لماذا الكمي المسائل: توصيف الظواهر في<em&gt; ذبابة الفاكهة</em&gt; اليرقات عصبي عضلي مفرق

Most studies on morphogenesis rely on qualitative descriptions of how anatomical traits are affected by the disruption of specific genes and genetic ...

Using Linear Agarose Channels to Study Drosophila Larval Crawling Behavior

Drosophila larval crawling is emerging as a powerful model to study neural control of sensorimotor behavior. However, larval crawling behavior on flat open surfaces is complex,&#160;including: pausing, turning, and meandering. This complexity in the repertoire of movement hinders detailed analysis of the events occurring during a single crawl stride cycle. To overcome this obstacle, linear agarose channels were made that constrain larval behavior to straight, sustained, rhythmic crawling. In principle, because agarose channels and the Drosophila larval body are both optically clear, the movement of larval structures labeled by genetically-encoded fluorescent probes can be monitored in intact, freely-moving larvae. In the past, larvae were placed in linear channels and crawling at the level of whole organism, segment, and muscle were analyzed1. In the future, larvae crawling in channels can be used for calcium imaging to monitor neuronal activity. Moreover, these methods can be used with larvae of any genotype and with any researcher-designed channel. Thus the protocol presented below is widely applicable for studies using the Drosophila larva as a model to understand motor control.

Using Linear Agarose Channels to Study Drosophila Larval Crawling Behavior

The Drosophila larva is a powerful model system to study neural control of behavior. This publication describes the use of linear agarose channels to elicit sustained bouts of linear crawling and methods to quantify the dynamics of larval structures during repetitive crawling behavior.

عن طريق القنوات الخطي الاغاروز لدراسة<em&gt; ذبابة الفاكهة</em&gt; اليرقات الزحف السلوك

Drosophila larval crawling is emerging as a powerful model to study neural control of sensorimotor behavior. However, larval crawling behavior on flat ...