Document Detail

The levels of male gametic mitochondrial DNA are highly regulated in angiosperms with regard to mitochondrial inheritance.
MedLine Citation:
PMID:  20605854     Owner:  NLM     Status:  MEDLINE    
The mechanisms that regulate mitochondrial inheritance are not yet clear, even though it is 100 years since the first description of non-Mendelian genetics. Here, we quantified the copy numbers of mitochondrial DNA (mtDNA) in the gametic cells of angiosperm species. We demonstrate that each egg cell from Arabidopsis thaliana, Antirrhinum majus, and Nicotiana tabacum possesses 59.0, 42.7, and 73.0 copies of mtDNA on average, respectively. These values are equivalent to those in Arabidopsis mesophyll cells, at 61.7 copies per cell. On the other hand, sperm or generative cells from Arabidopsis, A. majus, and N. tabacum possess minor amounts of mtDNA, at 0.083, 0.47, and 1 copy on average, respectively. We further reveal a 50-fold degradation of mtDNA during pollen development in A. majus. In contrast, markedly high levels of mtDNA are found in the male gametic cells of Cucumis melo and Pelargonium zonale (1296.3 and 256.7 copies, respectively). Our results provide direct evidence for mitochondrial genomic insufficiency in the eggs and somatic cells and indicate that a male gamete of an angiosperm may possess mtDNA at concentrations as high as 21-fold (C. melo) or as low as 0.1% (Arabidopsis) of the levels in somatic cells. These observations reveal the existence of a strong regulatory system for the male gametic mtDNA levels in angiosperms with regard to mitochondrial inheritance.
Dan-Yang Wang; Quan Zhang; Yang Liu; Zhi-Fu Lin; Shao-Xiang Zhang; Meng-Xiang Sun; Sodmergen
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-07-06
Journal Detail:
Title:  The Plant cell     Volume:  22     ISSN:  1532-298X     ISO Abbreviation:  Plant Cell     Publication Date:  2010 Jul 
Date Detail:
Created Date:  2010-08-27     Completed Date:  2010-12-30     Revised Date:  2011-08-01    
Medline Journal Info:
Nlm Unique ID:  9208688     Medline TA:  Plant Cell     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2402-16     Citation Subset:  IM    
Key Laboratory of Ministry of Education for Cell Proliferation and Differentiation, College of Life Sciences, Peking University, Beijing 100871, China.
Data Bank Information
Bank Name/Acc. No.:
GENBANK/AC006225;  AC007019;  AC007729;  AJ006293;  AJ006294;  AJ276622;  AY453102;  BA000042;  DQ317047;  FJ791301;  X92443;  Y08501
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MeSH Terms
Angiosperms / genetics*
DNA, Mitochondrial / genetics*
Molecular Sequence Data
Reg. No./Substance:
0/DNA, Mitochondrial

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