Biomedical subjects

C M Carareto

Publications and source records attributed to C M Carareto.

4 recordsLinked to original sources

PubMed2001

Evaluation of fitness components in strains of Drosophila mulleri carrying different genotypes for an esterase.

Several fitness components in strains of Drosophila mulleri carrying the slow or the fast alleles for the major beta esterase (esterase-4) found in this species, as well as in heterozygous flies in which the slow or fast alleles came from one of the parents, were evaluated. Twelve components were analysed including longevity of both virgins and mated males and females, productivity, viability, including the egg-larva, egg-pupa, egg-imago and pupa-imago periods. These parameters were used to estimate the total fitness for each genotype. The best score was reached by individuals having the Est-4S/Est-4S genotype (scored at 1.000), followed by a fitness value of 0.892 presented by the Est-4F/Est-4S genotype (with the fast allele from maternal origin), 0.863 for the Est-4F/Est-4F and 0.842 for the Est-4S/Est-4Fgenotypes (with Est-4F of maternal origin). These results suggested a higher relative adaptability of the Est-4S/Est-4S genotype followed by the Est-4F/Est-4S hybrid that possessed the allele Est-4S of maternal origin, which was incompatible with predictions of neutral polymorphism.

Adaptation, Biological↗

PubMed1999

The distribution of the P-M hybrid dysgenesis system in Drosophila melanogaster strains from Brazil.

Wild-caught flies of Drosophila melanogaster from seven natural populations of extreme regions of Brazil (São Luís, MA; Teresina, PI; Rio Cipó, MG; Maringá, PR; São José do Rio Preto, SP; Joinville, SC; and Porto Alegre, RS) were studied with the purpose of evaluating hybrid dysgenesis due to mobilization of P elements and the regulatory capacity of the strains' cytotypes. Diagnostic crosses were made and the strains classified according to their P-M phenotypes. Four strains were classified as moderate P (MA, MG, PI, and SP), two as Q (PR and RS) and one as M' (SC). Females of southern strains (PR, SC, and RS) presented in A crosses lower degrees of gonadal dysgenesis scores than those from northern strains (MA and PI).

Animals↗

PubMed1997

Testing transposable elements as genetic drive mechanisms using Drosophila P element constructs as a model system.

The use of transposable elements (TEs) as genetic drive mechanisms was explored using Drosophila melanogaster as a model system. Alternative strategies, employing autonomous and nonautonomous P element constructs were compared for their efficiency in driving the ry+ allele into populations homozygous for a ry- allele at the genomic rosy locus. Transformed flies were introduced at 1%, 5%, and 10% starting frequencies to establish a series of populations that were monitored over the course of 40 generations, using both phenotypic and molecular assays. The transposon-borne ry+ marker allele spread rapidly in almost all populations when introduced at 5% and 10% seed frequencies, but 1% introductions frequently failed to become established. A similar initial rapid increase in frequency of the ry+ transposon occurred in several control populations lacking a source of transposase. Constructs carrying ry+ markers also increased to moderate frequencies in the absence of selection on the marker. The results of Southern and in situ hybridization studies indicated a strong inverse relationship between the degree of conservation of construct integrity and transposition frequency. These finding have relevance to possible future applications of transposons as genetic drive mechanisms.

Animals↗

PubMedDate not supplied

[Giardiasis and helminthiasis in children of both public and private day-care centers and junior and high schools in the city of Mirassol, São Paulo State, Brazil].

This study showed different frequencies of intestinal parasitosis (giardiasis and helminthiasis) among children in day-care centers and junior and high schools (public and private). The survey involved 199 individuals, 96 belonging to public schools and 103 to private institutions. The frequency of giardiasis in public institutions was shown to be greater than in private institutions. Regarding helminthiasis, frequencies were similar among day-care centers, but greater for public schools in comparison to private institutions. When levels of socio-economic status, education, basic sanitary conditions and hygiene were analyzed as determinants of intestinal parasitosis, it became evident that greater frequency of giardiasis and helminthiasis occurred among children from low-income families and those whose parents had low levels of education. The source of vegetables was also a significant factor in determining such parasitosis.

Adolescent↗