Dictyostelium Discoidinum | Developmental Biology | CSIR DBT JRF 2026 | Lec-31 | IFAS

Dictyostelium Discoidinum | Developmental Biology | CSIR DBT JRF 2026 | Lec-31 | IFAS explained with clear concepts and exam-focused approach. Master aggregation, cAMP signalling, and terminal differentiation with PYQ tricks for CSIR NET & DBT JRF.

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⏳ Lecture Timeline:
[00:00:00] – Introduction to Dictyostelium discoideum
[00:09:35] – Concept: Part‑Time Multicellularity
[00:10:50] – Life Cycles: Asexual, Sexual, Aggregation
[00:18:02] – Aggregation Initiation: Starvation & cAMP
[00:23:00] – cAMP Pulses: Chemotaxis & Relay
[00:35:01] – Carben Receptor: GPCR‑like, ACA Activation
[00:43:35] – Aggregation Mechanism: Wave & PDE
[00:47:40] – Tip Mound & Slug Formation
[00:54:32] – Cell Adhesion: DdCAD‑1 (E‑cadherin‑like)
[00:59:05] – Discoidin: Fibronectin‑like, Large Aggregates
[01:04:25] – Terminal Differentiation: Stalk vs Spore
[01:07:48] – Stalk Signals: DIF‑1, β‑catenin Inhib., cGMP
[01:09:25] – Spore Signals: SDF‑1/2, cAMP, β‑catenin Act.
[01:12:00] – Three Adenylyl Cyclases: ACA, ACB, ACG
[01:13:44] – ACA Deficiency & cAMP Pulse Rescue
[01:16:18] – ACB: Spore Maturation (Glassy if Deficient)
[01:19:16] – ACG: Osmosensor, Spore Germination Control
[01:23:52] – ACG Deficiency: Inappropriate Germination
[01:29:22] – DPP: Practice Questions
[01:40:08] – Complete Session (Dictyostelium discoideum)

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📖 Topics Covered in This Lecture:
• Dictyostelium life cycle & aggregation
• cAMP wave signalling mechanism
• Cell adhesion molecules (csA, discoidin)
• Terminal differentiation (stalk/spore)
• Adenylate cyclases ACA, ACB, ACG roles
• PYQ analysis & problem‑solving

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📚 Lecture Summary:
In this session, IFAS Expert Faculty focuses on Dictyostelium discoideum, covering aggregation, cAMP relay, and terminal differentiation into stalk and spore. Key concepts like csA and discoidin adhesion, ACA/ACB/ACG functions, and PYQ‑based problem‑solving build exam‑ready clarity for CSIR DBT JRF. This Dictyostelium discoideum session bridges unicellular to multicellular transition.

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🎓 This lecture is highly beneficial for students preparing for:
✅ CSIR NET Life Science ✅ GATE Life Science ✅ GATE Biotechnology
✅ GATE Ecology & Evolutuon ✅ BET (DBT) ✅DHR ICMR (BRET)
✅ TIFR Biology  ✅ BARC Bioscience  ✅ SET / PhD Entrance Exams

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✅ CSIR NET Dec 2025: 4000+ Selections (AIR 3, 8, 9, 9...)
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✅ CSIR NET June 2024: 2000+ Selections (AIR 3, 10, 13...)
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