Developmental biology part 4 : sea urchin fertilization

For more information, log on to-
shomusbiology.w...
Download the study materials here-
shomusbiology.w...
Fertilisation (also known as conception, fecundation and syngamy) is the fusion of gametes to initiate the development of a new individual organism.[1] In animals, the process involves the fusion of an ovum with a sperm, which eventually leads to the development of an embryo. Depending on the animal species, the process can occur within the body of the female in internal fertilisation, or outside (external fertilisation). The cycle of fertilisation and development of new individuals is called reproduction.
Sperm find the eggs via chemotaxis, a type of ligand/receptor interaction. Resact is a 14 amino acid peptide purified from the jelly coat of A. punctulata that attracts the migration of sperm.
After finding the egg, the sperm penetrates the jelly coat through a process called sperm activation. In another ligand/receptor interaction, an oligosaccharide component of the egg binds and activates a receptor on the sperm and causes the acrosomal reaction. The acrosomal vesicles of the sperm fuse with the plasma membrane and are released. In this process, molecules bound to the acrosomal vesicle membrane, such as bindin, are exposed on the surface of the sperm. These contents digest the jelly coat and eventually the vitelline membrane. In addition to the release of acrosomal vesicles, there is explosive polymerisation of actin to form a thin spike at the head of the sperm called the acrosomal process.
The sperm binds to the egg through another ligand reaction between receptors on the vitelline membrane. The sperm surface protein bindin, binds to a receptor on the vitelline membrane identified as EBR1.
Fusion of the plasma membranes of the sperm and egg are likely mediated by bindin. At the site of contact, fusion causes the formation of a fertilisation cone. Source of the article published in description is Wikipedia. I am sharing their material. Copyright by original content developers of Wikipedia.
Link- en.wikipedia.or...

[@tajliha_jabin]

You are my real teacher... I used to get all the concepts n doubts clear from your videos..
I am doing bsc at Zoology.
I can't imagine my studies without our teaching.
I am topper of my class n all credits goes to u.
Thank you so much.

[@shomusbiologyofficial]

Thank you so much for appreciating my efforts

[@tajliha_jabin]

@@shomusbiologyofficial ur most welcome

[@AnaVerona_]

@@shomusbiologyofficial We all do. Thanks!

[@avipshajeff1274]

Best!!! I finally understood this as clear as water 🫡

[@shomusbiologyofficial]

All the best

[@swatipawar6343]

Rep. Sir... I m one of Asst. Prof. In microbiology department.
I also inspired.. lot through ur lectures and..
It's really nice and helpful to me and many students

[@shomusbiologyofficial]

Thank you so much for appreciating my efforts

[@nasreenfatma6735]

I've been watchn his videos sinc my first year of B.SC. Nw m in 2nd yr. I find his videos 2 b rly v. hlpful. Nd I think dt we shudn't try 2 find out ny sort of flaws n his video. Rather just take up all gud we can.

[@n.jagadeeshjagadeesh3108]

Thank u so much sir for providing those type of easy way lectures....once again thank you so much sir

[@shomusbiologyofficial]

You're welcome. Glad to hear that you're getting benefit from my lectures

[@sanamallik7285]

itna help karte Hain somu sir csir net ke liye bhi.
all credit goes to you sir .hum pakka try karenge net qualify karne ke liye

[@shomusbiologyofficial]

Thank you for appreciating my efforts

[@facts3436]

Thank u soo much sir for ur valuable lecture..

[@shomusbiologyofficial]

You're welcome

[@prangyalipsabiswal1574]

Thank you so much sir🙏

[@shomusbiologyofficial]

You're welcome. Glad to hear that you're getting benefit from my lectures

[@aparna8454]

sir can u explain about sequence of events in sperm entry

[@sabilisarma4445]

Sir please make a video on post fertilization events and pre fertilization events separately

[@fleurhamoir4443]

Very nicely explained, thank you very much! I was having a hard time understand it but now it's all clear :)

[@Tshidi_Mathabe]

This was extremely helpful . thank you :)

[@peculiarezindu1043]

this guy is so good....weldone sir......i pray for u that our good lord will make you greater and bless u with whatever you need in life......tnk u so much bro.....u are a blessing to your family and generation

[@naheedkhan1975]

very easy to follow thanks

[@DevSharma-fm6mw]

Nice explanation

[@shomusbiologyofficial]

You're welcome

[@souravdalapati.6270]

plz make another video on sea urchin fertilization.

[@reenukashyap1068]

Hello sir your videos help me a lot as my devolp. bio is very poor .The qus pattern is change now the csir donot include the chick embryo qus but they now mostly ask on c. elegens, A. thaliana.Could you please upload some new videos on these 2 topics .I'll be thankful to you

[@kalyanlohar476]

Thank you Sir. Very very thanks.

[@ssss...7896]

sr thnku...apki vidio bhut helpful h... thnk so much

[@haleybogers]

this guy is awesome

[@pragyasingh9359]

Awesome explanation

[@vanillabliss45]

super helpful! thanks

[@lubnakhan2842]

Correct fast block .previously u mentioned with sodium influx

[@valeriacuellar1139]

you are amazing thank you!!!

[@thakur4650]

Well explained

[@shomusbiologyofficial]

Thank you.

[@ramankumarlaldas8697]

Thanks.

[@soumost7808]

Thank you for all the videos .
Can you please also explain how the dorsal-ventral axis are formed.

[@rashmile]

Sou Most he mentions in an earlier video that the entry point of the sperm determines the ventral side. The sperm should only enter the egg on the animal hemisphere of the egg (as opposed to the vegetal hemisphere)

[@Doc_McStuffins]

Thank you

[@subhamkarmakar3320]

Shomu is best

[@Udayshankar8159]

Thank you sir

[@shomusbiologyofficial]

You're welcome

[@aminaamjad898]

Thank you soo much sir🤗🤗

[@shomusbiologyofficial]

You're welcome

[@himanirawat9957]

31:25 ...i didn't hear clearly the words after "movement" ... Can anybody help

[@lubnakhan2842]

Really Grt ,iam Nw able to answer no.of Mcq,s

[@101pragyashukla4]

Thanx now all my queries are solved:-)

[@wordseffect9523]

gelly coat or zona pellucida i have doubt sir

[@Medics321]

thankoo sir

[@bemanep4601]

thank you somuch sir

[@stsnotablebiology4227]

Thank u so much

[@asimchanda3830]

sir, i think u should repeat this chapter again ?

[@bhargavip3301]

Please koncham detect ga lessons start cheyandi

[@MountainMagics]

Ca+ 1st block 🤔🤔🤔???

[@CreatorNasir04]

I NEED SOME DETAILS ON EGG ACTIVATION OR METABOLIC ACTIVATION OF EGG

[@nikitagurung4551]

BE A REAL MAN THANKS hi

[@faisalali8572]

Bht hard h

[@arsalanibrahim1685]

nature of jelly coat ,,vitteline membrane ,,,???which type of chemicals or molecules they hv for sperm attacment and recognition????

[@Farahkhan-th2dm]

same question also arised in my mind

[@sunnyjutt8754]

Jelly coat contain glycoprotein (which attract or activate sperm )

[@karlbekker777]

That entrance! 🤣🤣🤣🤣🤣

[@shomusbiologyofficial]

You're welcome

[@anishamazumdar9723]

Your videos are great but I think it will be helpful if you use better terminology.

[@peculiarezindu1043]

hmm wat else wud u want again from this awesome video....it explains all in details

[@saidharani6731]

🙏🙏🙏🙏🙏🙏

[@shomusbiologyofficial]

You're welcome. Glad to hear that you're getting benefit from my lectures

[@riddhipatel4038]

have you cleared your csir net??

[@shomusbiologyofficial]

Yes I did in 2013

[@joybiswas6819]

bro, the plural form of nucleus is nuclei....not nucleuses...plz clear ur concept...

[@ShaVaughn]

YOU DECIDED TO COMPLAIN ABOUT THAT? TF

[@capsulecorp4952]

After all he is a human not a God or any thing else try to avoid such negative comments for such good helper

[@rekamnawaz3432]

thank you sir...