Transforming Gene Control with Magnetic Fields
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If this revolutionary method proves effective, it represents a monumental advancement in genetic science. Researchers from South Korea have developed a magnetically controlled switch designed to activate genes within cells, potentially paving the way for groundbreaking medical therapies. However, skepticism remains regarding the validity of their findings, particularly due to concerns about inconsistencies such as altered images in published research.
The pivotal concern is whether these results can be replicated by independent groups. Critic Andrew York, a physicist, stresses the necessity for verification prior to publication. “This assertion is so unprecedented that it warrants external validation to confirm reproducibility,” York noted, emphasizing a proactive approach to scientific scrutiny. He highlighted that the study has been in review for three years, ample time to confirm its findings with external research institutes.
The lead researcher, Kim Jong Pil, a professor at Dongguk University in Seoul, has indicated ongoing collaborations with various biotech firms and research organizations, with a commitment to releasing joint datasets in upcoming publications.
Existing methods, such as optogenetics, utilize light to influence biological processes by engineering cells to produce light-responsive proteins. This technology facilitates the firing of nerve cells when exposed to specific light frequencies, proving especially useful in research targeting certain visual impairments.
However, a critical limitation of optogenetics is its inability to penetrate deeply into body tissues. To address this, global researchers are exploring magnetic fields as alternative control signals for biological processes, with significant implications for both scientific research and clinical practices. Magnetic-based gene control may enable the manipulation of cellular functions to produce therapeutic proteins in a targeted manner.
In a study published in the esteemed journal Cell, Kim’s team asserts they have achieved “magnetogenetics,” utilizing a switch that activates genes in genetically modified cells, responsive to specific magnetic signals that can permeate the human body. Kim further clarified that the switch’s effect is negligible on non-modified genes, which supports its potential safety for medical applications.
Kim’s team employed a 4-kilohertz electromagnetic square wave with an intensity of 2 milliTesla, pulsing at 60 times per second. Their findings indicate that this signal prompted calcium ion oscillation within cells, with a cycle of less than one minute, due to interactions with cytochrome B5. Essentially, calcium ions demonstrated cycles of movement approximately every 50 seconds.
The exact mechanism by which these electromagnetic signals influence cytochrome B5 and induce this oscillation is still under investigation. “The biophysical processes involved are actively being researched,” Kim stated.
This biochemical oscillation purportedly activates the gene’s promoter sequence, LGR4, initiating the expression of subsequent genes. This sequence effectively creates a magnetically-controlled gene activation mechanism. The paper details the switch’s functionality across different cell types in both murine and human models.
York emphasizes the transformative potential of the findings, contingent upon validation. “It could fundamentally reshape our understanding of mammalian responses to electromagnetic fields.” However, he expressed concern over the seeming incongruity of a 60 Hz signal triggering such prolonged biological oscillations. “The physiological implications are extraordinary,” York concluded.
In response, Kim asserts that the oscillation duration is dictated by internal cellular signaling mechanisms, rather than external frequency inputs. “The subsequent oscillatory behaviors arise from intrinsic cellular processes,” he explained.
York also highlighted the substantial amplitude of these calcium oscillations, comparing their significance to a notable temperature fluctuation. “Such a profound physiological response should influence numerous cellular activities,” he remarked, even as the paper claims its effects are isolated to a single gene.
Kim refuted this assertion, maintaining that the magnitude of the signal remains within a considerate physiological range. In one notable experiment, researchers linked an electromagnetic switch to a gene encoding a luminescent protein. Harvard University investigator Adam Cohen pointed out discrepancies in the data, suggesting the engineered cells exhibited luminescence prematurely before activating the switch. Kim attributes this to “computational artifacts resulting from curve smoothing.”
On the PubPeer platform, commenter Yong‐Chang Zhou noted an image duplication concern in Figure S5P, where one image appeared to be a mirrored version of another. “Such mirroring is atypical when capturing images of the same sample,” he remarked, with concerns raised by Elizabeth Big, who focuses on scientific integrity.
Kim acknowledged a clerical error leading to duplicated control images. “We’re correcting this oversight and will provide the accurate raw data to Cell.
Inquiries into the Cell journal publisher regarding these discrepancies remain unanswered.
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Source: www.newscientist.com
