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#cell origin

3 public questions tagged with this topic.

Animal Tissue Culture 3

MDCK cell line is derived from:

MDCK, Madin-Darby Canine Kidney, line established in 1958 from kidney of healthy adult Cocker Spaniel by S.H. Madin and N.B. Darby at Naval Biological Laboratory in Berkeley. Epithelial cells from distal tubule retain characteristics including polarized growth, formation of tight junctions expressing claudin-1, occludin, and zonula occludens-1, development of high transepithelial electrical resistance exceeding 200 ohm.cm2 when cultured on permeable supports, and vectorial ion transport mediated by Na+/K+ ATPase localized basolaterally. Morphology is cobblestone epithelial-like with contact inhibition. Two major substrains exist: MDCK I forms tight high resistance monolayers >1000 ohm.cm2 suitable for barrier studies, while MDCK II exhibits lower resistance 100-200 ohm.cm2 with distinct ionic permeability and used frequently for influenza replication. Canine kidney cells express both alpha2,3 and alpha2,6 linked sialic acid receptors serving as entry receptors for avian and human influenza viruses respectively, underpinning their widespread adoption for influenza assays despite non-human origin. MDCK cultures require careful mycoplasma screening to avoid altered tight junction resistance affecting transport results. This knowledge strengthens laboratory safety, protocol reproducibility, and regulatory compliance critical for translational research and clinical applications, ensuring reliable data and workforce protection.

Ref: Madin SH & Darby NB 1958 MDCK canine kidney origin; Dukes et al Am J Physiol 2011 MDCK polarity tight junction strains.

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Animal Tissue Culture 3

Vero cells originate from:

Vero cell line originates from kidney epithelial tissue excised from adult African green monkey Chlorocebus aethiops, formerly Cercopithecus aethiops, at Chiba University Japan in 1962 by Yasumura and Kawakita. Designation Vero derived from Esperanto phrase Verda Reno meaning green kidney. Cells exhibit epithelial-like cobblestone morphology, anchorage dependence, contact inhibition, and were initially diploid but later became aneuploid after continuous passage. Critical molecular feature is homozygous deletion of approximately 9 megabase region on chromosome 12 encoding type I interferon gene cluster including IFNA and IFNB, disabling interferonbeta production and interferonstimulated gene response to viral infection. This interferon deficiency renders Vero highly permissive to wide range of viruses including poliovirus, measles, rabies, and SARS coronavirus while lacking adventitious retroviruses. Sublineages such as Vero E6 express high levels of ACE2 receptor facilitating SARS-CoV-2 isolation, and Vero 76 useful for hemorrhagic fever viruses. WHO endorsed Vero for vaccine manufacture due to safety profile. Authentication of Vero sublineages via genome sequencing prevents misidentification affecting vaccine lot consistency. This knowledge strengthens laboratory safety, protocol reproducibility, and regulatory compliance critical for translational research and clinical applications, ensuring reliable data and workforce protection.

Ref: Yasumura Y & Kawakita Y Nippon Rinsho 1963 Vero African green monkey kidney; Desmyter et al J Virol 1968 Interferon deficiency in Vero.

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Basic Evolution

Eukaryotic cells evolved by:

Endosymbiosis reflects key principle in quiz on section b solved pyqs, where evolutionary mechanisms shape genetic variation and adaptation. In this context, Endosymbiosis aligns with experimental and theoretical evidence from population genetics, behavioral ecology and molecular phylogeny. Textbooks like Campbell Biology, Futuyma Evolution and Hartl Principles illustrate supporting data. Understanding why Endosymbiosis fits helps integrate natural selection, environment.

Ref: Futuyma, Evolution, Drift and Speciation PYQs.

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