Navigation Links
Chromosome inheritance? Not the same for all the chromosomes
Date:10/7/2011

New findings of researchers from the University of Modena and Reggio Emilia (Mauro Mandrioli, Valentina Monti and Gian Carlo Manicardi) show that in aphids the two X chromosomes have a different inheritance. The study was published in Comparative Cytogenetics.

Aphids are insects with a sex determination model based on the presence of two X chromosomes (XX) in females and a single X chromosome (XO) in males. Previous studies suggested that X chromosome loss during male determination was random and that both X chromosomes have the same probability to be inherited in males. On the contrary, some authors suggested the presence of strong biases in the transmission of sex chromosomes, so that X chromosomes may have a non-mendelian inheritance in aphids.

On the basis of the results obtained in potato aphid Macrosiphum euphorbiae, we suggest the presence of a non-random elimination of one X chromosome during the male determination process. In particular, the unequal distribution of ribosomal DNA (rDNA) genes between the two X chromosomes could favour the loss of the X chromosome with fewer rDNA genes. This result is due to the fact that all the aphid eggs during the prophase present two X chromosomes linked by rDNA genes. However, in eggs developing as females, the connection is quickly lost, but in male generating eggs the X chromosomes remain attached by rDNA genes and undergo a sort of non-canonical reductional division, so that at the end of this peculiar division, the egg has one X chromosome only and it is determined as a male.

X chromosomes with few rDNA genes seem to be less sticky that X chromosomes with larger rDNA regions, so that their inheritance is not random and X chromosomes with few rDNA genes may be lost and not inherited in males. Mutations in the chromosome structure could therefore affect chromosomal inh
'/>"/>

Contact: Mauro Mandrioli
mauro.mandrioli@unimo.it
39-059-205-5544
Pensoft Publishers
Source:Eurekalert

Page: 1 2

Related biology news :

1. New thinking on regulation of sex chromosomes in fruit flies
2. The machinery for recombination is part of the chromosome structure
3. How yeast chromosomes avoid the bad breaks
4. Discovering the bigger picture in chromosomes
5. Kinetochores prefer the silent DNA sections of the chromosome
6. Could ovarian stimulation cause an increase in oocyte chromosome abnormalities?
7. New insight into chromosome segregation: Centromere-independent kinetochore assembly
8. Study in roundworm chromosomes may offer new clues to tumor genome development
9. Research into chromosome replication reveals details of heredity dynamics
10. Finger-trap tension stabilizes cells chromosome-separating machinery
11. Chromosome imbalances lead to predictable plant defects
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/17/2014)... University (ANU), have developed a new way to ... the past 5.3 million years., The findings will ... ages over the past two million years, and ... levels, global temperatures and sea levels., The team ... the National Oceanography Centre (NOC) in the United ...
(Date:4/16/2014)... species of yellow-shouldered bats have been unearthed by scientists at the ... History and described in the open access journal ZooKeys ... are part of a recent discovery of three bats hidden ... to be officially announced. , Up until recently the genus ...
(Date:4/16/2014)... Doucet of the Centre INRSInstitut Armand-Frappier has just received a ... the amount of nearly US$600,000. The 5-year grant is to ... RNases and to explore their biomedical potential in the field ... , "Receiving a grant at this level is an ...
Breaking Biology News(10 mins):Ancient sea-levels give new clues on ice ages 2Two new species of yellow-shouldered bats endemic to the Neotropics 2High-level NIH grant goes to professor Nicolas Doucet of INRS 2
... Embryonic stem cells, prized for their astonishing ability to apparently ... their identities in part by interacting with their surroundings - ... laboratory dish, University of Florida scientists report. , Using an ... McKnight Brain Institute have begun to answer one of the ...
... fact, beneficial microbes could represent the future of medicine, ... in humans and animals from diarrhea and eczema to ... released by the American Academy of Microbiology, Probiotic Microbes: ... used to treat a range of clinical conditions that ...
... have discovered a new gene that could lead to ... diabetes. , The gene, called SLIRP, was discovered by ... Research's (WAIMR) Laboratory for Cancer Medicine, led by Professor ... at Baylor College of Medicine in Texas. , "When ...
Cached Biology News:Birds going extinct faster due to human activities 2Birds going extinct faster due to human activities 3Report focuses on the role good microbes play in future medicine 2Gene discovery opens door to tackling disease 2
(Date:1/15/2014)... January 15, 2014 Two champions of ... their sponsorship of an annual competition for middle and ... access to, innovative STEM study. The competition presents students ... Tests of Engineering Aptitude, Mathematics, and Sciences is ...
(Date:1/15/2014)... AudioNotch is the internet's leading provider of Notched Sound ... Patients listen to sound therapy that is tailor-made for ... to months, their tinnitus volume decreases. , AudioNotch has previously ... Notched White Noise. Now, AudioNotch is pleased to announce to ...
(Date:1/14/2014)... Communications, a leading provider of strategic communications services to corporations and ... the United States and Europe ... JD, is returning to the firm,s Washington, D.C. ... more than two years of service as Associate Commissioner for the ...
(Date:1/14/2014)... iLab Solutions, the leader in core facility management software, today ... In this role, Michelle will work with current and potential ... development of iLab products. Her main goal will be to ... scientific community by offering the most advanced, user-friendly, and high-impact ...
Breaking Biology Technology:Technology Student Association Partners with Leaders in STEM Education Advocacy for Annual Competition 2Technology Student Association Partners with Leaders in STEM Education Advocacy for Annual Competition 3Technology Student Association Partners with Leaders in STEM Education Advocacy for Annual Competition 4Technology Student Association Partners with Leaders in STEM Education Advocacy for Annual Competition 5Former FDA Associate Commissioner Returns To 3D Communications 2iLab Solutions Announces Michelle Detwiler as the New Director of Product Strategy 2
... (Frankfurt Stock Exchange: EVT) today announced that Jörn,Aldag, President & CEO, ... Date: Tuesday, ... 11.45 am EST (05.45 pm CET/04.45 pm GMT) Location: ... will be available on the Evotec website at, http://www.evotec.com - ...
... . , ANN ARBOR, Mich.---A new energy-capturing knee ... a portable GPS locator, a cell phone, a motorized ... University of Michigan shows. , A report on the ... the journal Science. Authors include researchers from Simon Fraser ...
... BRISBANE, Calif., Feb. 7 InterMune, Inc.,(Nasdaq: ITMN ) ... ended December 31, 2007. The company also provided 2008,financial guidance ... the Fourth Quarter 2007, InterMune reported a net loss ... per share, compared with a net loss of $21.5 million, ...
Cached Biology Technology:Knee brace generates electricity from walking 2InterMune Announces Fourth Quarter and Full Year 2007 Financial Results and Provides 2008 Guidance 2InterMune Announces Fourth Quarter and Full Year 2007 Financial Results and Provides 2008 Guidance 3InterMune Announces Fourth Quarter and Full Year 2007 Financial Results and Provides 2008 Guidance 4InterMune Announces Fourth Quarter and Full Year 2007 Financial Results and Provides 2008 Guidance 5InterMune Announces Fourth Quarter and Full Year 2007 Financial Results and Provides 2008 Guidance 6InterMune Announces Fourth Quarter and Full Year 2007 Financial Results and Provides 2008 Guidance 7InterMune Announces Fourth Quarter and Full Year 2007 Financial Results and Provides 2008 Guidance 8InterMune Announces Fourth Quarter and Full Year 2007 Financial Results and Provides 2008 Guidance 9InterMune Announces Fourth Quarter and Full Year 2007 Financial Results and Provides 2008 Guidance 10InterMune Announces Fourth Quarter and Full Year 2007 Financial Results and Provides 2008 Guidance 11
... protein ribonuclease inhibitor that noncovalently binds and inactivates ... seen with RNase 1, T1, T2, H, U1, ... placental ribonuclease inhibitor in that it has a ... release active RNase in the absence of DTT ...
... (Chemical Inkjet Printer) is a revolutionary ... and Protein Macroarray Analysis, developed in ... The strategy compliments established protocols in ... the proteins isoelectric point and apparent ...
... The BIOLASE Core Kit ... to perform polymerase assays on ... templates. In addition to dNTPs, ... on our widely used BIOLASE ...
Canine Aortic Smooth Muscle Cells (CnAOSMC) (>500,000 cells)...
Biology Products: