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Titolo:
DIVERSITY IN THE REPRODUCTIVE MODES OF FEMALES OF THE RUTILUS ALBURNOIDES COMPLEX (TELEOSTEI, CYPRINIDAE) - A WAY TO AVOID THE GENETIC CONSTRAINTS OF UNIPARENTALISM
Autore:
ALVES MJ; COELHO MM; COLLARESPEREIRA MJ;
Indirizzi:
UNIV LISBON,FAC CIENCIAS,DEPT ZOOL & ANTROPOL,CTR BIOL AMBIENTAL,CAMPO GRANDE C2 PISO 3 P-1700 LISBON PORTUGAL UNIV LISBON,FAC CIENCIAS,DEPT ZOOL & ANTROPOL,CTR BIOL AMBIENTAL P-1700 LISBON PORTUGAL
Titolo Testata:
Molecular biology and evolution
fascicolo: 10, volume: 15, anno: 1998,
pagine: 1233 - 1242
SICI:
0737-4038(1998)15:10<1233:DITRMO>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHOXINUS-EOS-NEOGAEUS; HUMAN DNA; HYBRIDOGENETIC REPRODUCTION; MATERNAL ANCESTRY; RANA-RIDIBUNDA; HYBRID ORIGIN; GENOME; FINGERPRINTS; POECILIOPSIS; SEQUENCES;
Keywords:
RUTILUS ALBURNOIDES COMPLEX; HYBRID VERTEBRATES; UNIPARENTAL REPRODUCTION; MODIFIED HYBRIDOGENESIS; CROSSING EXPERIMENTS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
45
Recensione:
Indirizzi per estratti:
Citazione:
M.J. Alves et al., "DIVERSITY IN THE REPRODUCTIVE MODES OF FEMALES OF THE RUTILUS ALBURNOIDES COMPLEX (TELEOSTEI, CYPRINIDAE) - A WAY TO AVOID THE GENETIC CONSTRAINTS OF UNIPARENTALISM", Molecular biology and evolution, 15(10), 1998, pp. 1233-1242

Abstract

Hybrid minnows collectively known as the Rutilus alburnoides complex are found throughout much of the Iberian Peninsula and include diploidand polyploid forms with female-skewed sex ratios. Previous studies have suggested that diploid and triploid females from the northern Douro Basin reproduce by hybridogenesis. The present study, which is basedon experimental crosses and uses allozyme and minisatellite markers, reveals that diploid females from the Tejo Basin exhibit a different form of reproduction, transmitting the hybrid genome intact to the egg,which, upon fertilization, yields triploid progeny. Reproduction by triploid females from the southern Guadiana and Tejo basins resembles hybridogenesis in that one genome is discarded in each generation without recombination, but the remaining two homospecific genomes are not transmitted clonally. Elimination of the unmatched genome permits readysynapsis and meiosis between the homospecific genomes, and genetically distinct haploid eggs are produced (''meiotic hybridogenesis''). In some females, some sexual cells undergo an altered nonreductional meiosis, resulting in genetically diverse diploid eggs. In contrast to most hybrid vertebrate complexes, in which diploids and triploids are evolutionarily independent, in the R. alburnoides complex, there is a bidirectional movement of genes between diploid and triploid hybrids. Reproduction by the types of diploid and triploid females discussed here introduces high genotypic diversity into hybrid populations, and allows purging of deleterious genes and incorporation of beneficial mutations in the same genome, characteristics believed to be major advantagesof sexual reproduction.

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Documento generato il 25/09/20 alle ore 13:39:56