Navigation Links
Evolutionary biologists glimpse early stages of Y-chromosome degeneration
Date:5/13/2014

some degeneration in Rumex hastatulus, an annual plant from the southern USA commonly known as heartwing sorrel. We found that genes on the Y chromosomes have already started to undergo genetic degeneration, despite their relatively recent origin," said Josh Hough, a PhD candidate in U of T's Department of Ecology & Evolutionary Biology and lead author of the study. "Importantly, our results indicate that the extent of this degeneration depends on how long ago the genes on the sex chromosomes stopped recombining with each other."

The theory of sex chromosome evolution holds that Y-chromosome degeneration occurs as a result of X and Y chromosomes failing to recombine their genes during reproduction. Recombination is a key genetic process in which chromosomes pair and exchange their DNA sequences, and it occurs between all other chromosomes in the genome, including the X chromosome, which recombines in females. This genetic mixing has become suppressed between the X and Y chromosomes, however, probably because they contain genes that affect 'femaleness' and 'maleness', and combining these genes onto a single chromosome can cause infertility problems.

"Suppressing recombination between the X and Y makes sense because it prevents genes that determine female-specific traits from occurring on the Y chromosome," said Hough. But without recombination natural selection becomes less efficient, and harmful mutations cannot be removed from the Y chromosome. As a result, genes on the Y chromosome eventually become impaired in function or lost entirely."

The researchers crossed multiple male and female plants and then traced the inheritance of genes by sequencing the DNA in parents and their offspring. This allowed them to find which genes were located on the sex chromosomes because they segregate differently than genes on other chromosomes. Computer-assisted analyses of the genetic sequences enabled the scientists to then test for gene loss, loss of g
'/>"/>

Contact: Sean Bettam
s.bettam@utoronto.ca
416-946-7950
University of Toronto
Source:Eurekalert

Page: 1 2 3

Related medicine news :

1. A Revolutionary Dietary Paradigm: New Cookbook Features A SOS-free (Salt, Oil, Sugar ) Diet That Delivers the Optimal Food Plan for Renewing Health
2. Vygone Presents a Revolutionary Electro Waveform Device to Help Treat Molluscum Contagiosum Lesions
3. Evolutionary information improves discovery of mutations associated with diseases
4. Human Intellect Backsliding From Lack of Evolutionary Pressure: Study
5. Naturel Collagen Canada Unveils C RUM, the Newest Addition to the Revolutionary Natural Collagen Skin Care Product Line
6. U of T Researchers uncover major source of evolutionary differences among species
7. Brand id¦Strategic Partners Launches Revolutionary Personal Branding Success Program for Women
8. Mount Sinai Grad Student, 25, Named to Forbes ’30 Under 30’ In Science and Healthcare for ‘Revolutionary New Ideas’
9. Revolutionary techniques could help harness patients own immune cells to fight disease
10. Dr. Harvey’s Launches "Oracle": a Revolutionary Freeze-Dried, Highly Nutritious and Protein-Rich Line of Complete Foods for Dogs and Cats
11. How can evolutionary biology explain why we get cancer?
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:1/22/2015)... Angelweddingdress is a famous wedding dress company offering many trendy ... on Facebook, Twitter, and Pinterest. The fans will have an ... lottery every week. , Moreover, the company has extended its ... Angelweddingdress homepage for more information. , Angelweddingdress is ...
(Date:1/22/2015)... TX (PRWEB) January 22, 2015 A ... issue of experience and person-centeredness in the long-term care ... towards action across the continuum. The paper, “The Power ... Continuum,” engages perspectives and practices of the patient, resident ...
(Date:1/22/2015)... NJ (PRWEB) January 22, 2015 Joan ... and keynote speaker at the upcoming 32nd Annual ... ACCME-accredited Physicians’ Education Resource®, LLC (PER®) , shares ... would have gone undetected if she had not followed ...
(Date:1/22/2015)... Four years since the release of their debut recording Love ... of Avasa & Matthew Love – the duo are pleased to ... through White Swan Records on February 24, 2015. , THE ROAD ... available to all of us to walk out of the mire ...
(Date:1/22/2015)... 22, 2015 Compare-autoinsurance.org has released a new blog ... an auto insurance policy . , Some types of ... should check the newly released blog post to see if their ... dangerously damaged vehicles are some of the cars that cannot be ...
Breaking Medicine News(10 mins):Health News:Angelweddingdress Invites Its Customers To Follow It On Facebook, Twitter, And Pinterest 2Health News:The Power of Person-Centeredness in Long-Term Care Explored by The Beryl Institute 2Health News:The Power of Person-Centeredness in Long-Term Care Explored by The Beryl Institute 3Health News:Joan Lunden Reveals Diagnostic Approach That Led To Early Detection;To Keynote 32nd Annual Miami Breast Cancer Conference® 2Health News:Joan Lunden Reveals Diagnostic Approach That Led To Early Detection;To Keynote 32nd Annual Miami Breast Cancer Conference® 3Health News:Joan Lunden Reveals Diagnostic Approach That Led To Early Detection;To Keynote 32nd Annual Miami Breast Cancer Conference® 4Health News:Joan Lunden Reveals Diagnostic Approach That Led To Early Detection;To Keynote 32nd Annual Miami Breast Cancer Conference® 5Health News:Joan Lunden Reveals Diagnostic Approach That Led To Early Detection;To Keynote 32nd Annual Miami Breast Cancer Conference® 6Health News:THE ROAD by Avasa & Matthew Love -- A New Album 2Health News:THE ROAD by Avasa & Matthew Love -- A New Album 3Health News:THE ROAD by Avasa & Matthew Love -- A New Album 4Health News:Some Vehicles Cannot Be Covered By An Auto Insurance Policy! 2
... Global,s shared e-clinical service desk expands support to another ... leading ... Inc. (Nasdaq: TEAM ), a worldwide provider of information ... its subsidiary, TechTeam Global nv/sa, has been selected by,sanofi-aventis recherche ...
... MA--Researchers from Boston University School of Medicine have developed ... cancer. The model combines a specific gene expression ... These findings currently appear on-line in the journal ... leading cause of cancer death in the United States ...
... CHAPEL HILL, N.C., April 1, 2008 Faced ... forces are,having a challenging time serving the hospital ... to shrink, sales reps for the,pharma industry are ... win a place on formularies, according to research ...
... with Guaranteed Withdrawal Benefit, Turns Assets from Retirement ... ... Fortune 1000 Employees, NEW YORK, April 1, 2008 ... variable annuities,today launched a new variable annuity -- Crossings(SM): My ...
... Many top-selling drugs used to treat cancer and ... which are found in nature but historically difficult for ... For the first time, scientists at UC Irvine have ... easier for chemists to manipulate them into new drugs. ...
... 2008) Many patients who come to the ... are already taking 75mg of clopidogrel daily to ... 600-mg reloading dose of clopidogrel significantly improves clinical ... in patients with acute coronary syndromes (ACS), according ...
Cached Medicine News:Health News:TechTeam Global Will Provide Multilingual EDC Support Services for sanofi-aventis recherche & developpement 2Health News:TechTeam Global Will Provide Multilingual EDC Support Services for sanofi-aventis recherche & developpement 3Health News:Researchers develop new method to test for lung cancer 2Health News:Effectively Influencing the Hospital Marketplace to Win a Place on Formularies 2Health News:AXA Equitable Unveils Crossings(SM): My Lifetime IRA(SM) 2Health News:AXA Equitable Unveils Crossings(SM): My Lifetime IRA(SM) 3Health News:AXA Equitable Unveils Crossings(SM): My Lifetime IRA(SM) 4Health News:AXA Equitable Unveils Crossings(SM): My Lifetime IRA(SM) 5Health News:AXA Equitable Unveils Crossings(SM): My Lifetime IRA(SM) 6Health News:AXA Equitable Unveils Crossings(SM): My Lifetime IRA(SM) 7Health News:Scientists solve mystery of polyketide drug formation 2Health News:Clopidogrel reloading worthwhile in acute coronary syndromes 2
(Date:1/23/2015)... N.J. , Jan. 23, 2015  CytoSorbents Corporation ... commercializing its CytoSorb® extracorporeal cytokine adsorber to reduce ... announced the receipt of $385,642, net of transaction ... of the Technology Business Tax Certificate Transfer Program ...
(Date:1/23/2015)... , Jan. 23, 2015 Tianyin Pharmaceutical Inc. (NYSE ... specializes in the development and sale of patented biopharmaceutical ... active pharmaceutical ingredients (API) today announced the business and ... operation. 1. Following the September 2014 JCM ...
(Date:1/22/2015)... Jan. 22, 2015  ResMed Inc. (NYSE: RMD ) ... Revenue for the quarter was $423.0 million, a 10 percent ... 14 percent increase on a constant currency basis). Net income ... the quarter ended December 31, 2013. Diluted earnings per share ...
Breaking Medicine Technology:CytoSorbents Receives $385,000 in Non-Dilutive Funding from the New Jersey Technology Business Tax Certificate Transfer Program 2CytoSorbents Receives $385,000 in Non-Dilutive Funding from the New Jersey Technology Business Tax Certificate Transfer Program 3TPI's JCM Updates on Import Registration for International Clients 2TPI's JCM Updates on Import Registration for International Clients 3TPI's JCM Updates on Import Registration for International Clients 4ResMed Inc. Announces Results for the Second Quarter of Fiscal Year 2015 2ResMed Inc. Announces Results for the Second Quarter of Fiscal Year 2015 3ResMed Inc. Announces Results for the Second Quarter of Fiscal Year 2015 4ResMed Inc. Announces Results for the Second Quarter of Fiscal Year 2015 5ResMed Inc. Announces Results for the Second Quarter of Fiscal Year 2015 6ResMed Inc. Announces Results for the Second Quarter of Fiscal Year 2015 7ResMed Inc. Announces Results for the Second Quarter of Fiscal Year 2015 8ResMed Inc. Announces Results for the Second Quarter of Fiscal Year 2015 9ResMed Inc. Announces Results for the Second Quarter of Fiscal Year 2015 10ResMed Inc. Announces Results for the Second Quarter of Fiscal Year 2015 11
... 21, 2011  BARRX Medical Inc., a leader in developing ... to remove precancerous tissue from the gastrointestinal tract, announces ... be acquired by Covidien.  Covidien is a leading global ... advanced energy-based devices.  Covidien will acquire ...
... NORRITON, Pa., Nov. 21, 2011 Tengion, Inc. (NASDAQ: ... today announced that Brian Davis, Vice President Finance and ... upcoming Piper Jaffray 23rd Annual Health Care Conference on ... A live audio webcast of the presentation ...
Cached Medicine Technology:BARRX Medical, Inc. Announces Definitive Agreement to be Acquired by Covidien 2BARRX Medical, Inc. Announces Definitive Agreement to be Acquired by Covidien 3Tengion to Present at Piper Jaffray 23rd Annual Health Care Conference 2
For the quantitative determination of uric acid in serum....
The assay kit is for determination of uric acid in serum or urine. Wavelength: 600 nm. Linear range: up to 80 mg/dL....
For the quantitative determination of Uric Acid in serum. Linearity: 25 mg/dl....
... A fully automated, random ... over 50 assays available ... tumor marker, therapeutic drug, ... testing can be performed ...
Medicine Products: