Mitochondrial DNA polymorphism in a black fly, Simulium vittatum (Diptera: Simuliidae)

1998 ◽  
Vol 76 (3) ◽  
pp. 440-447 ◽  
Author(s):  
X. Zhu ◽  
K.P. Pruess ◽  
T.O. Powers
1998 ◽  
Vol 76 (3) ◽  
pp. 440-447 ◽  
Author(s):  
X Zhu ◽  
K P Pruess ◽  
T O Powers

Mitochondrial DNA (mtDNA) was extracted from pooled field-collected samples representing six species of black flies (Cnephia dacotensis, Simulium bivittaum, S. johansenni, S. luggeri, S. piperi, S. vittatum) and compared by restriction fragment length polymorphism (RFLP) analysis. Morphospecies were molecularly distinct, with few shared restriction fragments. Eleven populations of S. vittatum were found that appeared to be homogeneous for a single mitochondrial haplotype. Ten other populations of S. vittatum showed extensive mitochondrial heterogeneity. In part, these samples contained mixtures of two cytologically recognized siblings: IIIL-1 and IS-7. About 70% of the mitochondrial genome of a population pure for sibling IIIL-1 was cloned as five HindIII fragments, which were used as hybridization probes to examine individual black flies. Thirteen mtDNA haplotypes involving permutations of 10 HindIII restriction sites were identified in individual black flies examined from 26 populations. DNA from 168 larvae cut with both EcoR1 and HindIII revealed five additional haplotypes. One HindIII haplotype was present in 84% of 390 larvae examined and predominated in every population examined from New York to California and in both the IIIL-1 and IS-7 siblings. Nebraska populations had individuals with nearly all known haplotypes. The most common haplotype was usually the only form present in warm, silty streams with organic enrichment. Rarer haplotypes were found in cool, spring-fed streams but without clear geographic or phylogenetic components.


1986 ◽  
Vol 31 (2) ◽  
pp. 73-83 ◽  
Author(s):  
Shinji Harihara ◽  
Momoki Hirai ◽  
Keiichi Omoto

Author(s):  
М.В. Голубенко ◽  
Р.Р. Салахов ◽  
Т.В. Шумакова ◽  
С.В. Буйкин ◽  
О.А. Макеева ◽  
...  

Митохондриальный геном кодирует жизненно важные белки субъединиц дыхательной цепи и характеризуется высоким уровнем полиморфизма в популяциях человека. Однако работы по поиску генов предрасположенности к многофакторным заболеваниям, в том числе сердечно-сосудистым, часто ограничиваются анализом ядерного генома. В то же время показано, что отдельные генотипы мтДНК могут отличаться более высокой или низкой эффективностью окислительного фосфорилирования. Выявлены ассоциации популяционного полиморфизма мтДНК с сердечно-сосудистыми заболеваниями. Согласно результатам наших исследований, а также опубликованных другими авторами результатам ассоциативных и функциональных исследований, можно говорить о том, что эффект полиморфизма мтДНК проявляется чаще не в предрасположенности к сердечно-сосудистым заболеваниям в целом, а в риске развития осложнений и коморбидных фенотипов в пределах синтропии сердечно-сосудистого континуума. Mitochondrial genome, encoding respiratory chain subunits, is characterized by high polymorphism level in human populations. In most studies for susceptibility genes for common diseases, including cardiovascular diseases, the analysis is limited to the nuclear genome. It was shown that particular mtDNA genotypes may differ by oxidative phosphorylation efficiency. Some associations of mtDNA polymorphisms with cardiovascular diseases have been found. According to our results and published data, we suggest that mtDNA effect on cardiovascular system does not manifest in predisposition to cardiovascular diseases themselves but rather in risk of complications and comorbidities in the cardiovascular continuum.


Sign in / Sign up

Export Citation Format

Share Document