9 research outputs found
A robust and cost-effective method for DNA isolation from satureja species (lamiaceae)
Aromatic species of the genus Satureja are rich in secondary metabolites that interfere with DNA isolation procedures. Four protocols based on the standard CTAB DNA extraction protocol of Doyle and Doyle (1987) were tested in six savory taxa. The polyphenol adsorbents activated charcoal and/or polyvinylpyrrolidone 10 were employed in three procedures (B, C and D); for the elimination of polysaccharides, 4M NaCl was applied in the latter two. The highest DNA yield was obtained with Protocol D and averaged 1420.7 +/- 398.3 mu g DNA/g of dry leaf tissue. Optimal values of the absorbance ratio 260/280 of all DNA solutions revealed the absence or only negligible contamination by proteins. Contamination by polysaccharides inferred from the absorbance ratio 260/230 showed that Protocol C provided the least contaminated material (average of 1.7 +/- 0.4). Enzymatic reactions of DNA solutions obtained by Protocol D showed amplification of both loci in all individuals. In conclusion, Protocol D is suitable for the isolation of high quantities of pure DNA from Satureja spp
Cross-species amplification of nuclear est-microsatellites developed for other pinus species in pinus nigra
Due to the current lack of nuclear microsatellites (simple sequence repeats SSRs) specifically developed for Pinus nigra, an important European coniferous species, we cross-species amplified 12 EST-SSRs (expressed sequence tagged SSRs) developed for other Pinus species in P. nigra in order to delineate loci which can be used for assessing levels of genetic diversity and genetic structuring in this species. We amplified these loci in individuals from seven populations from the central Balkans representing four recognized infraspecific taxa of P. nigra (ssp. nigra, var. gocensis, ssp. pallasiana, and var. banatica). Contrary to expectations on high transferability of EST-SSRs into related species, only three out of 12 tested loci were successfully amplified in P. nigra, but they displayed lack/low levels of polymorphism or generated multilocus amplification products. Thus, our estimates on levels of genetic diversity (HE = 0.183) and genetic differentiation (F-ST = 0.007) were based on variability of a single locus harboring four alleles only and they should be taken with cautions. Our study highlights the need for the development of high-resolution molecular markers, such as co-dominant genic or genomic SSRs or predominantly biallelic SNPs, or utilization of anonymous dominant markers, such as AFLPs, for genotyping in P. nigra
Genetic patterns in Pinus nigra from the central Balkans inferred from plastid and mitochondrial data
Pinus nigra J.F. Arnold, European black pine, is a typical component of
Mediterranean and sub-Mediterranean coniferous forests with highly
fragmentary distribution. Western Mediterranean populations of this
species have been studied genetically to date, while eastern populations
from the central Balkans, which are larger and more abundant, are still
genetically understudied. We analyzed seven populations of P. nigra
representing all infraspecific taxa recognized within the central
Balkans (subspecies nigra with varieties nigra and gocensis Dordevic;
and subspecies pallasiana (Lamb.) Holmboe with varieties pallasiana and
banatica (Endl.) Georgescu et Ionescu), with three chloroplast
microsatellites (cpDNA SSRs) and one mitochondrial (mtDNA) locus.
Although our molecular data failed to support circumscription of studied
infraspecific taxa, we found that genetic patterns at both genomes are
in accordance with those found previously in westward populations of
this species, that is - exceptionally high levels of genetic diversity
(H-T = 0.949) and low genetic differentiation (G(ST) = 0.024) at the
cpDNA level, and moderate levels of genetic diversity (H-T = 0.357) and
genetic differentiation (G(ST) = 0.358) at the mtDNA level. Based on
genealogical relations of mtDNA types currently present in Balkans' and
Iberian/African populations, we inferred that the ancestral gene pool of
P. nigra already harbored polymorphism at position 328 prior to the
divergence to two lineages currently present in westward and eastward
parts of the species range distribution. Subsequent occurrence of three
mutations, which distinguish these two lineages, suggests their
long-term isolation.Ministry of Education, Science, and Technology of the Republic of Serbia
{[}173029, 173030
Genetic patterns in Pinus nigra from the central Balkans inferred from plastid and mitochondrial data
Pinus nigra J.F. Arnold, European black pine, is a typical component of Mediterranean and sub-Mediterranean coniferous forests with highly fragmentary distribution. Western Mediterranean populations of this species have been studied genetically to date, while eastern populations from the central Balkans, which are larger and more abundant, are still genetically understudied. We analyzed seven populations of P. nigra representing all infraspecific taxa recognized within the central Balkans (subspecies nigra with varieties nigra and gocensis Dordevic; and subspecies pallasiana (Lamb.) Holmboe with varieties pallasiana and banatica (Endl.) Georgescu et Ionescu), with three chloroplast microsatellites (cpDNA SSRs) and one mitochondrial (mtDNA) locus. Although our molecular data failed to support circumscription of studied infraspecific taxa, we found that genetic patterns at both genomes are in accordance with those found previously in westward populations of this species, that is - exceptionally high levels of genetic diversity (H-T = 0.949) and low genetic differentiation (G(ST) = 0.024) at the cpDNA level, and moderate levels of genetic diversity (H-T = 0.357) and genetic differentiation (G(ST) = 0.358) at the mtDNA level. Based on genealogical relations of mtDNA types currently present in Balkans' and Iberian/African populations, we inferred that the ancestral gene pool of P. nigra already harbored polymorphism at position 328 prior to the divergence to two lineages currently present in westward and eastward parts of the species range distribution. Subsequent occurrence of three mutations, which distinguish these two lineages, suggests their long-term isolation
Essential oil composition and antioxidant activity of two Juniperus communis L. varieties growing wild in Serbia
CROSS-SPECIES AMPLIFICATION OF NUCLEAR EST-MICROSATELLITES DEVELOPED FOR OTHER Pinus SPECIES IN Pinus nigra
Due to the current lack of nuclear microsatellites (simple sequence
repeats SSRs) specifically developed for Pinus nigra, an important
European coniferous species, we cross-species amplified 12 EST-SSRs
(expressed sequence tagged SSRs) developed for other Pinus species in P.
nigra in order to delineate loci which can be used for assessing levels
of genetic diversity and genetic structuring in this species. We
amplified these loci in individuals from seven populations from the
central Balkans representing four recognized infraspecific taxa of P.
nigra (ssp. nigra, var. gocensis, ssp. pallasiana, and var. banatica).
Contrary to expectations on high transferability of EST-SSRs into
related species, only three out of 12 tested loci were successfully
amplified in P. nigra, but they displayed lack/low levels of
polymorphism or generated multilocus amplification products. Thus, our
estimates on levels of genetic diversity (HE = 0.183) and genetic
differentiation (F-ST = 0.007) were based on variability of a single
locus harboring four alleles only and they should be taken with
cautions. Our study highlights the need for the development of
high-resolution molecular markers, such as co-dominant genic or genomic
SSRs or predominantly biallelic SNPs, or utilization of anonymous
dominant markers, such as AFLPs, for genotyping in P. nigra.Ministry of Education, Science, and Technology of the Republic of Serbia
{[}173029, 173030
Leaf n-Alkanes as Characters Differentiating Coastal and Continental Juniperus deltoides Populations from the Balkan Peninsula
The composition of the cuticular n-alkanes isolated from the leaves of
nine populations of Juniperus deltoides R. P. Adams from continental and
coastal areas of the Balkan Peninsula was characterized by GC-FID and
GC/MS analyses. In the leaf waxes, 14 n-alkane homologues with
chain-lengths ranging from C22 to C35 were identified. n-Tritriacontane
(C33) was dominant in the waxes of all populations, but variations
between the populations in the contents of all n-alkanes were observed.
Several statistical methods (ANOVA, principal component, discriminant,
and cluster analyses) were used to investigate the diversity and
variability of the cuticular-leaf-n-alkane patterns of the nine J.
deltoides populations. This is the first report on the n-alkane
composition for this species. The multivariate statistical analyses
evidenced a high correlation of the leaf-n-alkane pattern with the
geographical distribution of the investigated samples, differentiating
the coastal from the continental populations of this taxon.Ministry of Education, Science and Technological Development of Serbia
{[}173029, 172053
Leaf n-Alkanes as Characters Differentiating Coastal and Continental Juniperus deltoides Populations from the Balkan Peninsula
The composition of the cuticular n-alkanes isolated from the leaves of
nine populations of Juniperus deltoides R. P. Adams from continental and
coastal areas of the Balkan Peninsula was characterized by GC-FID and
GC/MS analyses. In the leaf waxes, 14 n-alkane homologues with
chain-lengths ranging from C22 to C35 were identified. n-Tritriacontane
(C33) was dominant in the waxes of all populations, but variations
between the populations in the contents of all n-alkanes were observed.
Several statistical methods (ANOVA, principal component, discriminant,
and cluster analyses) were used to investigate the diversity and
variability of the cuticular-leaf-n-alkane patterns of the nine J.
deltoides populations. This is the first report on the n-alkane
composition for this species. The multivariate statistical analyses
evidenced a high correlation of the leaf-n-alkane pattern with the
geographical distribution of the investigated samples, differentiating
the coastal from the continental populations of this taxon.Ministry of Education, Science and Technological Development of Serbia
{[}173029, 172053
Caseload management and outcome of patients with aortic stenosis in primary/secondary versus tertiary care settings-design of the IMPULSE enhanced registry.
Background
Severe aortic stenosis (AS) is one of the most common and most serious valve diseases. Without timely intervention with surgical aortic valve replacement or transcatheter aortic valve replacement, patients have an estimated survival of 2-3 years. Guidelines for the treatment of AS have been developed, but studies suggest that as many as 42% of patients with AS are not treated according to these recommendations.The aims of this registry are to delineate the caseload of patients with AS, outline the management of these patients and determine appropriateness of treatments in participating centres with and without onsite access to surgery and percutaneous treatments.
Methods/design
The IMPULSE enhanced registry is an international, multicentre, prospective, observational cohort registry conducted at four central full access centres (tertiary care hospitals) and at least two satellite centres per hub (primary/secondary care hospitals). An estimated 800 patients will be enrolled in the registry and patient follow-up will last for 12 months.
Discussion
In addition to the primary aims determining the caseload management and outcome of patients with AS in primary, secondary and tertiary care settings, the registry will also determine a time course for the transition from asymptomatic to symptomatic status and the diagnostic steps, treatment decisions and the identification of decision-makers in tertiary versus primary/secondary care hospitals. The last patient will be enrolled in the registry in 2018 and results of the registry are anticipated in 2019.
Registration number
NCT03112629