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Employing Induced Pluripotent Stem Cells for Primordial Germ Cells Generation in Mammalian Wildlife: Challenges and Opportunities – A Review Cover

Employing Induced Pluripotent Stem Cells for Primordial Germ Cells Generation in Mammalian Wildlife: Challenges and Opportunities – A Review

Open Access
|Apr 2026

Figures & Tables

Figure 1.

Representation of the principal interactions between pluripotency transcription factors to induced reprogramming and pluripotency state in target cells. In addition, differentiation of iPSCs into PGCs and germ line markers are represented. Abbreviations: KLF4: Kruppel-like factor 4, OCT4: octamer-binding transcription factor 4, NANOG: Nanog homeobox, SOX2: SRY-box transcription factor 2, c-MYC: MYC proto-oncogene, BMP4: bone morphogenetic protein 4, PRDM14: PR domain zinc finger protein 14, SOX17: SRY-box transcription factor 17, BLIMP1: B lymphocyte-induced maturation protein 1 (also known as PRDM1), TFAP2C: transcription factor AP-2 gamma iPSCs: induced pluripotent stem cells, EpiLC: epiblast-like cells, PGCs: primordial germ cells, PGCLCs: primordial germ cell-like cells, bFGF: basic fibroblast growth factor, SCF: stem cell factor, EGF: epidermal growth factor, LIF: leukemia inhibitory factor

Figure 2.

Future application representation of in vitro gametogenesis using iPSCs in endangered animal species

Figure 3.

Numbers of reports of iPSCs attainments represented, according to IUCN category. CR: critically endangered, EN: endangered, VU: vulnerable, NT: near threatened, LC: least concern, EW: extinct in the wild

Principal reports of iPSCs attainment in wild animal species reprogramming (Total number of cells plated) × 100

SpeciesCommon nameReprogrammed cell typeReprogramming methodReprogramming factorsiPSCs characterizationReprogramming efficiency (5)PGCs generationReferences

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Macaca mulattaRhesus monkeyAdult fibroblastsRetroviral vector (pMX)OSKMPME, TGLD in vitro and in vivo0.033%NoLiu et al., 2008
Mandrillus leucophaeusDrillAdult fibroblastsRetroviral vectorOSKMKaryotype, PME, TGLD in vivo0.0003NoBen-Nun et al., 2011
Ceratotherium simum cottoniNorthern white rhinocerosAdult fibroblastsRetroviral vector (retro-VSV. G viruses)OSKMKaryotype, PME, TGLD in vitro0.0006NoBen-Nun et al., 2011
Macaca fascicularisLong-tailed macaqueAdult fibroblasts/Fetal fibroblastsLentivirus vectorOSKMPME, TGLD in vitro and in vivoNRNoOkahara-Narita et al., 2012
Panthera unciaSnow leopardAdult fibroblastsMoloney-based retroviral vectors (pMXs)OSKM NANOGKaryotype, PME, TGLD in vivo0.000525%NoVerma et al., 2012
Bubalus bubalisWater buffaloFetal fibroblastsRetroviral vector (pMX)OSKMKaryotype, PME, TGLDin vivo and in vitro0.77%NoDeng et al., 2012
Microtus ochrogasterPrairie voleEmbryonic fibroblastsEcotropic retrovirus vectorOSKMPME, TGLD in vivo and in vitro0.0013%NoManoli et al., 2012
Panthera tigrisTigerAdult fibroblastsRetroviral vector (pMX)OSKM NANOGKaryotype, PME, TGLD in vivo and in vitro0.00065%NoVerma et al., 2013
Leptailurus servalServalAdult fibroblastsRetroviral vector (pMX)OSKM NANOGKaryotype, PME, TGLD in vivo and in vitro0.00067%NoVerma et al., 2013
Panthera oncaJaguarAdult fibroblastsRetroviral vector (pMX)OSKM NANOGKaryotype, PME, TGLD in vivo and in vitro0.00062%NoVerma et al., 2013
Pan troglodytesChimpanzeeAdult fibroblastsRetroviral vector (non specified)OSKMKaryotype, PME, TGLD in vivo and in vitroNRNoMarchetto et al., 2013
Pan paniscusPygmy chimpanzeeAdult fibroblastsRetroviral vector (non specified)OSKMKaryotype, PME, TGLD in vivo and in vitroNRNoMarchetto et al., 2013
Myotis brandtiiBrandt's batEmbryonic fibroblastsPiggyBac (PB) vectorOSKM LIN28 Nr5a2 miR302/367Karyotype, PME, TGLD in vivo and in vitro0.001%NoMo et al., 2014
Pan paniscusPygmy chimpanzeeAdult fibroblastsLentiviral vectorOSKMKaryotype, PME, TGLD in vivo and in vitroNRNoWunderlich et al., 2014
Gorilla gorilla gorillaWestern lowland gorillaAdult fibroblastsLentiviral vectorOSKMKaryotype, PME expression, TGLD in vivo and in vitroNRNoWunderlich et al., 2014
Pongo abeliiSumatran orangutansAdult fibroblastsRetroviral pMX vectorOSKMPME, TGLD in vivo and in vitroNRNoRamaswamy et al., 2015
Equus africanus somaliensisSomali wild assAdult fibroblastsRetroviral vector (non specified)OSKMPMENRNoBen-Nun et al., 2015
Bos javanicusBantengAdult fibroblastsRetroviral vector (non specified)OSKMPMENRNoBen-Nun et al., 2015
Neovison visonAmerican minkEmbryonic fibroblastsLentiviral vector + Valproic acidOSKMKaryotype, PME, TGLD in vivo1.2%NoMenzorov et al., 2015
Tokudaia osimensisRyukyu spiny ratAdult fibroblastsPiggyBac (PB) transposase vectorsOSKM NANOGKaryotype, PME, TGLD in vivo and in vitro0.000333%Oocytes: 0.29%; Spermatocyte : 0.031%Honda et al., 2017
Heterocephalus glaberNaked mole-ratAdult and embryonic fibroblastsLentiviral vectorOSKMPME, TGLD in vivo and in vitro0.24%NoLee et al., 2017
Sarcophilus harrisiiTasmanian devilAdult fibroblastsLentiviral vectorOSKM NANOG LIN28AKaryotype, PME, TGLD in vitro0.0002%NoWeeratunga et al., 2018
Ictidomys tridecemlineatusThirteen-lined ground squirrelNeural precursor cellsLentiviral and Sendai virus vectorsOSKMPME, TGLD in vitro0.0002%NoOu et al., 2019
Ornithorhynchus anatinusPlatypusAdult fibroblastsLentiviral vectorOSKM LIN28Karyotype, PME, TGLDin vitro0.0002%NoWithworth et al., 2019
Ictidomys tridecemlineatusThirteen-lined ground squirrelNeural precursor cellsLentiviral and Sendai virus vectorsOSKMPME, TGLD in vitroNRNoSinghal et al., 2020
Equus grevyiGrevy's zebraAdult fibroblastsRetroviral pMXs vectorsOSKMKaryotype, PME, TGLD in vitro0.75%NoEndo et al., 2022
Ceratotherium simumsimumSouthern white rhinocerosAdult fibroblastsNon-integrating Sendai virusMYC-5 KLF4-3Karyotype, PME, TGLD in vitro0.0077%Yes PGCME:BMP4 PRDM1 PRDM14 TFAP 2cKorody et al., 2021
Ceratotherium simum cottoniNorthern white rhinocerosAdult fibroblastsSendai virus vectorOSKMTGLD in vitro, PGCs differentiationEmbryonic PSCsNoHayashi et al., 2022
Dicerorhinus sumatrensisSumatran rhinocerosAdult fibroblastsSendai virus vectorOSKMKaryotype, TGLD in vitro, PMEEfficency range: 0.000013–0.000081%NoZywitza et al., 2022
Bactrian camelBactrian camelFetal fibroblastsRetroviral vector pMXOSKMKaryotype, TGLD in vitro and in vivo0.036%NoLi et al., 2023
Callithrix jacchusCommon marmosetPeripheral blood mononuclearSendai reprogramming kitKOS C-MYC, KLF-4Karyotype, PME, TGLD in vitro1.7%NoSeita et al., 2023
Elephas maximusAsian elephantPlacental endothelial cellsSendai and lentivirus vectorsOSKM NANOG LIN28A, blocking TPS3 expressionKaryotype, PME, TGLDin vitroNRNoAppleton et al., 2024
Macaca nigraCrested macaqueAdult fibroblastsSendai virus reprogramming kitOSKMKaryotype, PME, TGLD in vitro0.12–0.14%PGCME: BMP4, PRDM1, and TFA2C in vitroBao et al., 2024
Hylobates larLar gibbonAdult fibroblastsSendai virus reprogramming kitOSKMKaryotype, PME, TGLD in vitro>1%PGCME: BMP4, PRDM1, and TFA2C in vitroBao et al., 2024
Symphalangus syndactylusSiamangAdult fibroblastsEpisomal plasmidsOSKMKaryotype, PME, TGLD in vitro0.19%PGCME: BMP4, PRDM1, and TFA2C in vitroBao et al., 2024
Nasalis larvatusProboscis monkeyAdult fibroblastsEpisomal plasmidsOSKMKaryotype, PME, TGLD in vitro>1%PGCME: BMP4, PRDM1, and TFA2C in vitroBao et al., 2024
Ailuropoda melanoleucaGiant pandaAdult fibroblastsEpisomal plasmidsOCT4, SOX2, SV40LT, and KLF4PME, karyotype, TGLD in vitro and in vivo, AP activity0.00006%NoLiu et al., 2024

Induced pluripotent stem cells (iPSCs) in domestic species and their reprogramming efficiency across different species and induction protocolsThe reprogramming efficiency = (Number of iPSC colonies / Total number of cells plated) × 100

Species and common nameReprogrammed cell typeReprogramming methodReprogramming factorsiPSCs characterizationReprogramming efficiency (5)References
Capra aegagrus hircus (goat)Lentiviral vectorBovine POU5F1, SOX2, MYC, KLF4, LIN-28, and NANOG + MIR302/3 +FGFColony morphology, AP activity, and TGLD in vitro and in vivo0.00016%Sandmaier et al., 2015
Canis lupus familiaris (dog)Sendai virus vectorHuman factors OCT3/4, KLF4, SOX2, C-MYC, NANOG, and LIN28AAP activity in vitro and in vivo TGLD, PME and karyotype0.05%Tsukamoto et al., 2024
Canis lupus familiaris (dog)Sendai virus vectorCanine factors OCT3/4, KLF4, SOX2, C-MYC, NANOG, and LIN28AAP activity in vitro and in vivo TGLD, PME and karyotype0.2%Tsukamoto et al., 2024
Bos taurus (cattle)Retroviral vectorOSKM murine factorsAP activity in vitro and in vivo TGLD, PME and karyotype0.09%Cravero et al., 2015
Bos taurus (cattle)Retroviral vectorOSKM murine factorsAP expression, TGLD in vivo, PME and karyotype0.11%Cravero et al., 2015
Sus scrofa domesticus (pig)Lentiviral vectorOSKM human factorsAP expression, TGLD in vitro, PME11.30%Machado et al., 2020
Sus scrofa domesticus (pig)Lentiviral vectorOSKM mice factorsAP expression, TGLD in vitro, PME10.14%Machado et al., 2020
Sus scrofa domesticus (pig)Episomal vectorsFGF2, activin A, Chir99021, and IWR1Karyotype, PME, TGLD in vivo0.13%Conrad et al., 2023
Equine (horse)Polycistronic lentiviral vectorhOSKM (human factors) at 5% O2AP detection, PME, TGLD in vitro0.08%de Castro et al., 2020
Equine (horse)Polycistronic lentiviral vectorhOSKM (human factors) at 20% to 5% O2AP detection, PME, TGLD in vitro0.09%de Castro et al., 2020
Equine (horse)Polycistronic lentiviral vectorhOSKM (human factor) at 20% O2AP detection, PME, TGLD in vitro0.06%de Castro et al., 2020
Ovis aries (sheep)PiggyBac transposon systemBovine OCT4, SOX2, KLF4, cMYC, porcine NANOG, human LIN28, SV40 large T antigen, and human TERTChimeric contribution to the early blastocysts of sheep and mice in vitro, PME0.1%Lui et al., 2021
Capra aegagrus hircus (goat)Lentiviral vectorBovine POU5F1, SOX2, MYC, KLF4, LIN-28, and NANOG reprogramming factors in combination with a MIR302/3 +LIFColony morphology, AP expression, and TGLD in vivo and in vitro0.00004%Sandmaier et al., 2015

Principal reports of primordial germ cells (PGCs) or germ line cells attainment in domestic animal species

Species and common nameReprogrammed cell typeReprogramming methodReprogramming factorsiPSCs or origin cell type characterizationReprogramming efficiency (5)PGCs generation and characterizationReferences
Capra aegagrus hircus (goat)ESCsBMP-4 and RABMP-4 and RA (for PGCs differentiation)Morphology and differentiation abilityEfficiency of oocyte formation from ESCs: 25–34.61%PGCs markers: VASA, DAZL, STELLA, and PUM1 were detected at protein and mRNA level.Malik et al., 2020
Canis lupus familiaris (dog)AMSCsCulture medium for PGCs differentiationBMP4 (12.5 ng/mL) for PGCs differentiationCAMSCs are positive for MSCs markers and PMENRPGCME: PRDM1, PRDM14, AP2γ and. male germ markers: PLZF, VASA and DMRT1Wei et al., 2016
Bos taurus (cattle)Adult fibroblasts5-azacytidineBMP2, BMP4 follicular fluid (for PGCs differentiation)mRNAs for SOX2, OCT4, NANOG and REXNRPGCME: VASA, DAZL and GDF9. Also markers of oocytes (ZPA, GDF9 and SCP3)do Nascimento Costa et al., 2017
Bos taurus (cattle)Somatic adult cell (no specified)NRNRNR (they work with a iPSCs line previously characterized)NRDetection of AP, PME and PGCME: OCT4, DDX4, VASA, and OCT4 and SOX2, as well as of imprinted genes (H19, SNRPN)Bressan et al., 2019
Bos taurus (cattle)PB-MSCs, and SSCCM derived from SCsCM derived from SCsPluripotent, GCs, and MSC marker expression.NRSSCs cultured with SCs/CM increased the expression of PIWIL2 and DAZL, while PB-MSCs only increased the expression of DAZL.Segunda et al., 2024
Equus ferus caballus (horse)Embryonic fibro-blasts + ESCsEpisomal vectorOSKM + Lin28PME expression, in vitro and in vivoNRPGCME SOX17/TFAP2C/PRDM1 PGC differentiation in vitro and contribution to chimera in vivoYu et al., 2021
Sus scrofa domesticus (pig)Embryonic fibro-blastsNRPorcine iPSCs CM: LIF medium NR specific factorsAP-positive PME, TGLD in vitroNRGCM expression: PRDM1, PRDM14, STELLA. DAZL and VASA. Differentiation into SSCsWang et al., 2016
Sus scrofa domesticus (pig)Adult dermal fibroblastsSTEMCCASOX2, TFAP, EP4, MYC+ bFGFPME14.58%GCM (VASA, DAZL) and BLIMP1, PRDM14Pieri et al., 2022
Ovis aries (sheep)MSCs10 μM RARA for male GSCs differentiationThree mesenchymal differentiation lineagesNR
  • AP activity.

  • Expression of VASA and beta1 INTEGRIN

  • Male germ line markers

Ghasemzadeh-Hasankolaei et al., 2014
Capra aegagrus hircus (goat)GSCs derived from 2–5-month fetal testisRA for male GSCs differentiationRA for male GSCs differentiationOct4, Sox2, C-myc, and TertEfficiency of GSCs lines: 30%GCM (VASA), and haploid markers (FE-J1, PRM1). Differentiation into sperm-like cells in vivo and sperms in vitroHua et al., 2011
DOI: https://doi.org/10.2478/aoas-2025-0073 | Journal eISSN: 2300-8733 | Journal ISSN: 1642-3402
Language: English
Page range: 439 - 465
Submitted on: Aug 6, 2024
Accepted on: Jun 27, 2025
Published on: Apr 15, 2026
In partnership with: Paradigm Publishing Services
Publication frequency: Volume open

© 2026 Constanza Aguilera, Yat Sen Wong, Diana Echeverry, Daniel Veraguas-Dávila, Daniela Cartes, published by National Research Institute of Animal Production
This work is licensed under the Creative Commons Attribution 4.0 License.