# MSGV1

Here is a table summarizing the issues related to the development of the MSGV1 vector, as well as relevant details regarding transduction, analysis, and controls:

| **Aspect** | **Details** |
| --- | --- |
| **Vector Name** | MSGV1 (Murine Stem Cell Virus-based Splice Vector) |
| **Vector Testing Method** | Retroviral vector transduction of SupT1 cells |
| **Analysis Technique** | Fluorescence-activated cell sorting (FACS) staining for CD3 or anti-Vα12 |
| **Vector Integration Confirmation** | Confirmed using Southern blot analysis |
| **Cell Line Used for Integration Test** | PG13 clone AIB 18 |

Here is a comprehensive table summarizing the steps and components involved in the construction of the retroviral vectors, as well as the procedures for TCR chain determination, vector assembly, cell transfection, and integration analysis:

| **Aspect** | **Details** |
| --- | --- |
| **RNA Isolation & TCR Chain Determination** | RNA from MART-1–reactive T-cell clone (M1F12) was subjected to RACE-PCR and DNA sequencing to determine TCRα and β chain usage. TCR usage (IMGT nomenclature): α chain - TRAV35/TRAJ49/TRAC, β chain - TRBV10-3/TRBD1/TRBJ1-5/TRBC1. |
| **Primer Design for Cloning** | Primers designed for full-length cDNA cloning based on determined TCR chains. |
| **Poly(A) RNA Isolation** | Poly(A) RNA from 1 × 10⁷ M1F12 T cells was isolated using Poly (A) Pure mRNA Purification Kit. |
| **RT-PCR and Cloning** | RT-PCR was conducted using Titan One Tube RT-PCR Kit. Amplified TCRα and β chains were gel purified, cloned into pCR2.1-TOPO vector, and confirmed by sequencing. |
| **Vector Backbone** | pMSGV1 derived from pMSGV, which uses MSCV LTR. Contains extended gag region and env splice site from SFGtcLucITE4 vector. Modifications for pMSGV1 include Kozak sequence enhancement. |
| **Vector Variants Constructed** | Four retroviral vectors (APB, AIB, BPA, BIA) expressing both TCR chains. Each vector constructed with different combinations of PGK promoter, IRES element, and TCRα/β chain orientations. |
| **Transfection of Packaging Cells** | PG13 and Phoenix Eco cells cocultured and transfected with vector constructs (AIB, BIA, APB, BPA) using Gene Porter reagent. |
| **PG13 Clone Generation** | Clones generated after 14-day coculture and Phoenix Eco cell removal using magnetic antibody-coated beads. |
| **Physical Titer Screening** | Initial screening of PG13 clones via RNA dot blot to determine physical titer. |
| **Transduction and FACS Analysis** | Highest-titer clones tested via retroviral transduction of SupT1 cells. Analyzed by FACS for CD3 or anti-Vα12 expression. |
| **Southern Blot Analysis** | Confirmed vector integration and copy number in PG13 clone AIB 18. |
| **Control Vector** | MSGIN vector for GFP expression and anti-gp100 TCR (APB9) vector used for control in transducing PBL or TIL aliquots. |

This table provides a structured overview of the experimental steps, from RNA isolation and vector construction to cell transfection and integration confirmation.

For the site tree, see the [root Markdown](https://slashpage.com/damia-note.md).