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 inheritance even if these changes do not affect regions involved in centromere functioning.


'/>"/>

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

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:5/6/2017)... 2017 RAM Group , Singaporean ... breakthrough in biometric authentication based on a ... to perform biometric authentication. These new sensors are based ... by Ram Group and its partners. This sensor will ... chains and security. Ram Group is a next ...
(Date:4/17/2017)... , April 17, 2017 NXT-ID, Inc. (NASDAQ: ... announces the filing of its 2016 Annual Report on Form 10-K ... Commission. ... 10-K is available in the Investor Relations section of the Company,s ... the SEC,s website at http://www.sec.gov . 2016 Year ...
(Date:4/11/2017)... , Apr. 11, 2017 Research and Markets ... 2017-2021" report to their offering. ... The global eye tracking market to grow at a CAGR ... Global Eye Tracking Market 2017-2021, has been prepared based on an ... the market landscape and its growth prospects over the coming years. ...
Breaking Biology News(10 mins):
(Date:5/24/2017)... ... May 23, 2017 , ... Federal funding for basic and applied scientific ... life-saving medical and other vital technologies — deserves continued support, say leaders of ... scientific community today in responding to the President’s budget request for Fiscal Year 2018. ...
(Date:5/23/2017)... Ca (PRWEB) , ... May ... ... (PSCs) offer an unlimited source of human cardiovascular cells for research and ... differentiation methods makes it possible to generate large numbers of cardiomyocytes (hPSC-CMs). ...
(Date:5/23/2017)... ... 23, 2017 , ... Energetiq Technology, a world leader in ... to accommodate its rapid growth. , The renovations at the company’s headquarters in ... existing areas. The expansion includes, a state-of-the-art engineering facility, and a second clean ...
(Date:5/22/2017)... , ... May 22, 2017 , ... Stratevi, a boutique ... to the East Coast. It has opened an office in downtown Boston at 745 ... finding it increasingly more important to generate evidence on the value they provide, not ...
Breaking Biology Technology: