1. A method for isolating a population of recombinant adeno-associated virus (rAAV) particles from in-process impurities in a feedstream, comprising the steps of:(a) contacting a feedstream containing the rAAV particles with an apatite chromatography medium in the presence of polyethylene glycol (PEG), wherein the rAAV particles bind to the apatite chromatography medium; and(b) eluting the rAAV particles bound to the apatite chromatography medium with an elution buffer containing less than 3% (w/v) PEG.
2. The method of claim 1 , wherein the apatite chromatography medium is ceramic hydroxy apatite (CHT).
3. The method of claim 1, wherein the apatite chromatography medium is ceramic fluoroapatite (CFT).
4. The method of claim 1, wherein the specific binding of the apatite chroma attooggrraapphhyy mmeeddiiuumm ttoo tthhee xrAAAV particles is between 1014 and 1016 DNase-resistant particles per milliliter (DRP/mL).
5. The method of claim 1 , further comprising a step of binding the rAAV particles in the feedstream eluted from the apatite chromatography medium to an anionic chromatography medium.
6. The method of claim 1 , wherein the feedstream containing the rAAV particles in step (a) is contacted with an apatite chromatography medium in the presence of polyethylene glycol (PEG) and a basic buffer.
7. The method of claim 6, wherein the basic buffer is between pH 7.6 and 10.
8. The method of claim 6, wherein the basic buffer is between pH 8.0 and 10.0.
9. The method of claim 6, wherein the basic buffer is between pH 9.0 and 10.0.
10. The method of claim 6, wherein the basic buffer comprises borate.
11. The method of claim 1, wherein the PEG has an average molecular weight between about 5,000 (PEG5000) grams per mole and about 15,000 (PEG15000) grams per mole.
12. The method of claim 11 , wherein the PEG has an average molecular weight of about 6,000 (PEG6000) grams per mole.
13. The method of claim 1, wherein the feeds tream containing the rAAV particles in step (a) is contacted with the apatite chromatography medium in the presence of between about 3% (w/v) and about 10% (w/v) PEG.
Claims
1. A method for isolating a population of recombinant adeno-associated virus (rAAV) particles from in-process impurities in a feedstream, comprising the steps of: (a) (i) contacting a feedstream containing the rAAV particles with an apatite chromatography medium in the presence of polyethylene glycol (PEG), wherein the rAAV particles bind to the apatite chromatography medium; and (ii) eluting the rAAV particles bound to the apatite chromatography medium with an elution buffer containing less than 3% (w/v) PEG; and (b) (i) contacting the feedstream eluted from the apatite chromatography medium containing the rAAV particles with a hydrophobic interaction chromatography (HIC) medium in a high salt buffer comprising citrate, wherein the rAAV particles and the in-process impurities bind to the HIC medium; and (ii) eluting the rAAV particles bound to the HIC medium with a medium salt buffer.
2. The method of claim 1, wherein the apatite chromatography medium is ceramic hydroxyapatite (CHT) or ceramic fluoroapatite.
3. 3–5. (canceled)
6. The method of claim 1, wherein the feedstream containing the rAAV particles in step (a)(i) is contacted with an apatite chromatography medium in the presence of polyethylene glycol (PEG) and a basic buffer.
7. (canceled)
8. The method of claim 6, wherein the basic buffer is between pH 8.0 and 10.0.
9. (canceled)
10. The method of claim 6, wherein the basic buffer comprises borate.
11. The method of claim 1, wherein the PEG has an average molecular weight between about 5,000 (PEG5000) grams per mole and about 15,000 (PEG15000) grams per mole.
12. (canceled)
TABLE 2. Screening of resins for binding of rAAV-1 compared to binding of process contaminants
Resin
Resin Type
rAAV-1
Helper Virus
Host Cell DNA
Serum Albumin
Serum Proteins
UnoS pH 5.5
Cation Exchange
+
0
−
+
+
UnoS pH 7.0
Cation Exchange
−
−
−
−
−
UnoQ pH 8.5
Anion Exchange
+
++
++++
++
++
UnoQ pH 7.0
Anion Exchange
+
+++
++++
++
++
Fractogel EMD SO3
Cation Exchange
+
++
−
0
0
CHT
Apatite
+
0
++
+
+
CFT
Apatite
+
0
++
+
+
HIC Phenyl
Hydrophobic Exchange
−
−
−
0
0
HIC Butyl
Hydrophobic Exchange
+
++
−
0
0
HIC Hexyl
Hydrophobic Exchange
+
++
−
0
0
HIC PPG
Hydrophobic Exchange
−
−
−
0
0
Source S
Ion Exchange
+
0
0
++
0
Source Q
Ion Exchange
+
0
0
++
0
TMAE
Ion Exchange
+
0
0
++
0
IMAC FeCl3
0
0
−
+
+
Superdex 200
Gel Filtration
void
void
chase
chase
chase
HW55
Gel Filtration
void
void
chase
chase
chase
HW65
Gel Filtration
void
void
chase
chase
chase
HW75
Gel Filtration
void
void
chase
chase
chase
Key: (−) = present in flow-through (no binding); + = weakly bound (eluted very early in the gradient); ++ to ++++ = stronger binding (eluted further along the gradient).
TABLE 3. Relative strength of binding of rAAV-1 and BSA to apatite resin at pH = 6.5 or pH = 9.0, with or without 5% (w/v) PEG6000
Source: Leerink note May 2, 2019Source: Biomarin presentationTable 1: ABR prior to and following treatment with valoctocogene roxaparvovec in BioMarin’s Phase 1/2 study, as presented at the WFH Virtual Summit 2020. (BioMarin)https://mma.prnewswire.com/media/1192101/BioMarin_Table_1_ABR.html
すなわち、3,000人 x 6e13 vg/kg x 70kgが年間の必要量。1000L bioreactor x 2 x 20年間製造数で割ると、1.5E14 vg/Lの培養生産性であることが推定できます。
BioMarin Provides 2 Years of Clinical Data in 6e13 vg/kg Dose from Ongoing Phase 1/2 Study in Valoctocogene Roxaparvovec Gene Therapy for Severe Hemophilia A at World Federation of Hemophilia 2018 World Congress
BioMarin Provides Highlights of 4 Years of Clinical Data from Ongoing Phase 1/2 Study of Valoctocogene Roxaparvovec Gene Therapy for Severe Hemophilia A
44) Lock M., Alvira M., et al. Rapid, simple, and versatile manufacturing of recombinant adeno-associated viral vectors at scale. Hum. Gene Ther. 2010;21(10):1259-1271. [PubMed]
Harvest & Clarification
目的rAAV以外の不純物は、ヒトへの投与では炎症の元となる
細胞由来たんバク質
細胞由来DNA
血清タンパク質
培地成分
ヘルパーDNA または、ヘルパーウイルス
References:
[1]. Patrick, K.L. et al. 2016. For Better or Worse: Cytosolic DNA Sensing during Intracellular Bacterial Infection Induces Potent Innate Immune Responses. J Mol Biol 428, 3372-3386.
発現タイターの検討
GFP コントロールウイルスでトランスフェクション効率条件を検討する。
Process Development
USP/DSP
[ignore]
(2.0千万円/50L/6m)
[/ignore]
2015年現在、AAVの精製の報告
rAAV1
Poros 50HQ→Poros 10HQ→Sephacryl S-300 HR (AEX/AEX/SEC)
Scalable Downstream Strategies for Purification of Recombinant Adeno-Associated Virus Vectors in Light of the Properties. 2015, Curr Pharm Biotechnol. 2015 Aug; 16(8):684-695
フランスのGENETHONは現在、ThermoFisherの傘下になったアメリカのBRAMMERとの間で、遺伝子治療薬のウイルスベクター製造における改良研究について共同発表しました。(Accelerating advancement in gene therapy by improving downstream purification of viral vectors)