Breaking News
November 20, 2018 - Towards finding a druggable cancer target
November 20, 2018 - Ultragenyx Announces Intent to Submit New Drug Application to U.S. FDA for UX007 for the Treatment of Long-chain Fatty Acid Oxidation Disorders in Mid-2019
November 20, 2018 - Cooling ‘brains on fire’ to treat Parkinson’s
November 20, 2018 - Less pollution could increase the average lifespan of Copenhageners by an entire year in 2040
November 20, 2018 - Abramson Cancer Center becomes the 28th member institution of National Comprehensive Cancer Network
November 20, 2018 - The plug and play time-resolved spectrometer from PicoQuant
November 20, 2018 - Breakthrough technology offers new hope to people with glaucoma, retinitis and macular degeneration
November 20, 2018 - New report highlights key focus areas to help cancer screening realize its full potential
November 20, 2018 - International experts to discuss strategies to maintain spatial orientation in old age
November 20, 2018 - Scientists discover new inhibitor that decreases lung inflammation
November 20, 2018 - Participation project calls for relaxing research ban on germline interventions
November 20, 2018 - Karyopharm’s Selinexor Receives Fast Track Designation from FDA for the Treatment of Patients with Relapsed or Refractory Diffuse Large B-cell Lymphoma
November 20, 2018 - Arthritis by the Numbers: Book of Trusted Facts & Figures
November 20, 2018 - Drug homing method helps rethink Parkinson’s
November 20, 2018 - AHF commends the passage of global AIDS funding in the House, calls for swift approval
November 20, 2018 - The search for new psychiatric disorder treatments
November 20, 2018 - New research offers hope for simpler way to diagnose and treat cancer
November 20, 2018 - Study sheds light on the infection mechanism of influenza virus
November 20, 2018 - Storage failures of eggs and embryos gain a new perspective
November 20, 2018 - Buyers of short-term health plans: Wise or shortsighted?
November 20, 2018 - Study indicates that frogs in virus-exposed groups breed at young age
November 20, 2018 - FDA Alerts Health Care Professionals and Patients Not To Use Sterile Drug Products from Pharm D Solutions
November 20, 2018 - Asthma may contribute to childhood obesity epidemic
November 20, 2018 - Researchers to explore the enigmatic role of unstructured protein in regulating circadian function
November 20, 2018 - Many patients with adenomas do not receive colonoscopy within recommended time frame
November 20, 2018 - Drug used to treat PTSD does not reduce suicidal thinking, may worsen nightmares and insomnia
November 20, 2018 - In-person social contact may offer protection against depression and PTSD symptoms
November 20, 2018 - Routine HCV testing in correctional facilities can best identify and treat disease, say researchers
November 20, 2018 - Molecular DNA analysis could facilitate more accurate prognosis, treatment of aggressive brain tumors
November 20, 2018 - Breast Cancer Recurrence Rate Not Up With Autologous Fat Transfer
November 20, 2018 - Beta 2 Microglobulin (B2M) Tumor Marker Test: MedlinePlus Lab Test Information
November 20, 2018 - Could bariatric surgery make men more virile?
November 20, 2018 - Urine test to check if patients take their medications will save the NHS money, say researchers
November 20, 2018 - Study reveals impact of residual inflammatory risk on clinical outcomes after PCI
November 20, 2018 - RNAi therapy shown to alleviate preeclampsia
November 20, 2018 - Replacement of dysfunctional microglia has therapeutic potential for neurodegenerative diseases
November 20, 2018 - Forming 3D Neuronal Models of the Brain
November 20, 2018 - Shoulder ultrasounds could be used to predict diabetes
November 20, 2018 - SGLT2 Inhibitors for Diabetes Linked to Increased Risk for Amputation
November 20, 2018 - Stem cell transplant cements Arizona men’s father-son bond
November 20, 2018 - Scientists try to develop portable systems that can quickly produce biologics on demand
November 20, 2018 - Automating Data Capture and Image Analysis in Continuous Experiments
November 20, 2018 - New drug shows promise for treating people with peanut allergy
November 20, 2018 - Researchers develop novel mouse model to study immunomodulatory therapies
November 20, 2018 - “Britain must not go backward on antibiotic controls to appease US trade deals” – Jim Moseley, CEO of Red Tractor
November 20, 2018 - Widespread errors in ‘proofreading’ cause inherited blindness
November 20, 2018 - Reaping the benefits of living longer
November 20, 2018 - New Program Hopes to Make Early Detection and Treatment of ALS a Reality
November 19, 2018 - Artificial bone-like substance mimics the way real bone grows at atomic level
November 19, 2018 - FDA Grants Orphan Drug Designation To RGX-181 Gene Therapy For The Treatment Of CLN2 Form Of Batten Disease
November 19, 2018 - Systemic mastocytosis – Genetics Home Reference
November 19, 2018 - Eye trauma secondary to falls in older adults increasing
November 19, 2018 - Empowering women in India to improve their health: A Q&A
November 19, 2018 - Researchers have trained a computer to analyze breast cancer images and classify tumors
November 19, 2018 - New glucose binding molecule could be key to better metabolic control for diabetics
November 19, 2018 - Biologists uncover novel genetic control of lipid maintenance and its potential connection to lifespan
November 19, 2018 - Warmer winters may set scene for higher rates of violent crimes
November 19, 2018 - Personalized program of physical exercise effective in reversing functional decline in the elderly
November 19, 2018 - Acacia Pharma Resubmits Barhemsys New Drug Application
November 19, 2018 - PDL1 (Immunotherapy) Tests: MedlinePlus Lab Test Information
November 19, 2018 - Transforming pregnancy research with a smartphone app
November 19, 2018 - Stanford Medicine magazine explores how digital technology is changing health care
November 19, 2018 - Vision impairments may increase risk of falls in older adults
November 19, 2018 - Concomitant use of sleeping pills and opioids found to prevalent among people with Alzheimer’s disease
November 19, 2018 - Marijuana prevention programs should focus on promoting mental wellbeing of youth
November 19, 2018 - New report calls for greater awareness and emphasis on scale and impact of atrial fibrillation
November 19, 2018 - In throes of turkey salmonella outbreak, don’t invite illness to your table
November 19, 2018 - UK health policies should be redesigned to become more accessible for men
November 19, 2018 - Short Interpregnancy Intervals Tied to Adverse Outcome Risk
November 19, 2018 - New mothers’ breastfeeding pain can affect infant health
November 19, 2018 - Stanford Medicine magazine reports on ways digital technology is transforming health care | News Center
November 19, 2018 - Human drugs alter cricket personality
November 19, 2018 - Insilico Medicine to introduce ‘Cure a disease in a year’ program at Biodata World Congress 2018
November 19, 2018 - Experts debate over whether gut or brain is more important in regulating appetite
November 19, 2018 - Playing on fear and fun, hospitals follow pharma in direct-to-consumer advertising
November 19, 2018 - 2PG Company receives grant to develop sensitive, low-cost molecular diagnostic tests for tuberculosis
November 19, 2018 - Low-Carb Diets May Work By Boosting Calorie Burn
November 19, 2018 - Key molecule responsible for learning and memory discovered
November 19, 2018 - New blood test developed for early diagnosis of ovarian cancer
November 19, 2018 - Researchers identify molecule to fight myotubular myopathy
Jumping genes or transposons and their role in the genetic code

Jumping genes or transposons and their role in the genetic code

image_pdfDownload PDFimage_print

Researchers have found that there a numerous transposons or “jumping genes” within the genetic code that is responsible for development of the embryo and its growth. These were earlier thought to be junk or useless parts of the genome.

The jumping genes were first found in corn DNA by biologist Barbara McClintock who won the Nobel in 1983. Since then this phenomenon has been studied in detail by numerous scientists.

The team of researchers have found that these DNA sequences or transposons are called jumping genes because they can introduce copies of themselves or change their location in the genetic code. Till now these were thought to be genetic parasites that replicated without purpose and served no use. Half of the genetic code was found to be transposons.

Now a new study has shown that these sequences are actually very important for growth, development and also evolution of the species. Around a quarter of them for example are responsible for working on the genetic switches that turn off and on and can alter protein synthesis and gene action.

These regulatory sequences are known to contain bits of transposons which have now become part of the genome. These transposons are commonly found to insert themselves where they did not belong and this may lead to mutations. While mutations are necessary for evolution, they are also responsible for genetic diseases and cancers.

The team of researchers led by Developmental biologist Miguel Ramalho-Santos from University of California, San Francisco looked at a transposon that forms 17 percent of the human genome – transposon LINE1.

They wanted to study if this gene sequence just existed or contributed to embryonic development. They found that in order to replicate LINE1 makes a RNA copy of itself. Thereafter an enzyme converts this RNA into DNA.

This DNA sequence gets incorporated into the genome. Ramalho-Santos says that this movement of the gene could be disastrous for the growing embryo. But it seemed that the embryos have a high degree of transposon activity and movement. The purpose of the transposon movement within the embryos was the puzzle the team was trying to solve. The study results were published in the latest issue of the journal Cell this week.

To understand what LINE1 did, they devised a method to reduce the LINE1 RNA content by 80 to 90 percent. Then they tested the effect this restriction had on the mouse embryos and their stem cells. The results showed that removal or reduction of the LINE1 RNA led to a reduce capacity of the embryonic cells to replenish themselves. As LINE1 action was stopped, the team noted that the embryo stopped at the two cell stage. This means that the embryo then cannot implant itself or get embedded in the wall of the uterus for further development. This translates into no developing fetus and no baby.

The team found that the RNA from the transposon works with two proteins that allow the embryo to develop from its two cell stage.

Ramalho-Santos says that transposons are not “selfish parasites” as believed earlier but are helpful parts of the genome that help on embryonic development. Nearly 500,000 copies of LINE1 exist in the human genome say experts. All of their roles in humans are still unclear.

Tagged with:

About author

Related Articles