Genetic polymorphism of the alpha-globin haplotypes in a population from Calabria (southern Italy). Studies with variants of the alpha-globin chain.
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Adolescent↗
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Genetic polymorphism of the vitamin D binding protein and another post-albumin protein in horse serum.
Horizontal polyacrylamide gel electrophoreses, on 10% separation gel, of horse serum revealed polymorphism of the vitamin D binding protein (Gc protein) and another post-albumin protein (Pa). Family data supported the hypothesis that Gc and Pa types were controlled by autosomal codominant alleles. For both Gc and Pa proteins, the homozygous types showed a single fraction while the heterozygous type had two fractions. Pa types were found to be identical to the post-albumin types reported earlier by starch gel electrophoresis. Two Gc alleles, GcF and GcS, and three Pa alleles, Pa D, Pa F and Pa S, were observed in samples from Swedish (four breeds), Lipizzaner and Arab horses. The frequency of the more common allele at the two loci, i.e. GcF and PaF, ranged from 0.72-0.93 and from 0.58-0.99, respectively, in the different breeds studied. Plasma samples showed an extra protein fraction near the GcS fraction and thus were found unsuitable for Gc typing.
Alpha-Globulins↗
Genetic polymorphism and isoenzyme patterns of lactate dehydrogenase in tench (Tinca tinca), crucian carp (Carassius carassius) and carp (Cyprinus carpio).
Isoenzyme patterns and the polymorphism of lactate dehydrogenase (LDH) were investigated in 3 fish species of family Cyprinidae, i.e. tench (Tinca tinca), crucian carp (Carassius carassius) and carp (Cyprinus carpio). The isoenzyme patterns were tissue and species specific. In crucian carp subunits with different electrophoretic mobility are present, which are genetically controlled from the B1, B2, A1, A2 and C loci, while the set of loci in carp is B1, B2, A, C1 and C2 and in tench B, A, C. The locus B of LDH in tench, the locus B2 in crucian carp, and the loci B1, C1 and C2 in carp are polymorphic and have two different alleles in each case. The polymorphism did not affect the total LDH activity in the tissues. All the populations investigated were in Hardy-Weinberg equilibrium. The genetic control of the polymorphism in B1 and C1 loci in carp was proved by test matings. The polymorphism in B loci tested in erythrocytes may be utilized as genetic markers in the fish breeding.
Animals↗
Genetic polymorphisms affecting telomere length and their association with cardiovascular disease in the Heinz-Nixdorf-Recall study.
Short telomeres are associated with cardiovascular disease (CVD). We aimed to investigate, if genetically determined telomere-length effects CVD-risk in the Heinz-Nixdorf-Recall study (HNRS) population. We selected 14 single-nucleotide polymorphisms (SNPs) associated with telomere-length (p<10-8) from the literature and after exclusion 9 SNPs were included in the analyses. Additionally, a genetic risk score (GRS) using these 9 SNPs was calculated. Incident CVD was defined as fatal and non-fatal myocardial infarction, stroke, and coronary death. We included 3874 HNRS participants with available genetic data and had no known history of CVD at baseline. Cox proportional-hazards regression was used to test the association between the SNPs/GRS and incident CVD-risk adjusting for common CVD risk-factors. The analyses were further stratified by CVD risk-factors. During follow-up (12.1±4.31 years), 466 participants experienced CVD-events. No association between SNPs/GRS and CVD was observed in the adjusted analyses. However, the GRS, rs10936599, rs2487999 and rs8105767 increase the CVD-risk in current smoker. Few SNPs (rs10936599, rs2487999, and rs7675998) showed an increased CVD-risk, whereas rs10936599, rs677228 and rs4387287 a decreased CVD-risk, in further strata. The results of our study suggest different effects of SNPs/GRS on CVD-risk depending on the CVD risk-factor strata, highlighting the importance of stratified analyses in CVD risk-factors.
Humans↗
Genetic polymorphism in Plasmodium falciparum MSPDBL1 and MSPDBL2 and their impact on B- and T-cell immunodominant epitopes in Brazilian malaria-endemic areas.
Merozoite Surface Protein Duffy Binding-like 1 and 2 (MSPDBL1 and MSPDBL2) are involved in erythrocyte invasion by Plasmodium falciparum. Antibodies targeting PfMSPDBL1 and PfMSPDBL2 show strong opsonizing and growth-inhibitory activities, supporting their potential as asexual blood-stage vaccine candidates. Given that the extensive genetic diversity of P. falciparum contributes to immune evasion, identifying polymorphisms in regions encoding PfMSPDBL1 and PfMSPDBL2 is essential to assess their relevance as vaccine targets. In this study, we investigated polymorphisms in the pfmspdbl1 and pfmspdbl2 genes and their impact on potentially antigenic regions within the Duffy Binding-like (DBL) and Secreted Polymorphic Antigen Associated with Merozoite (SPAM) domains. Blood samples were collected from 47 P falciparum-infected individuals from three malaria-endemic areas of the Brazilian Amazon. Genomic DNA was extracted, PCR-amplified, and sequenced. Intrapopulation genetic diversity and Tajima's D values were estimated using bioinformatics tools. Linear B- and T-cell epitopes were predicted using BCPreds and IEDB (Immune Epitope Database), respectively. Two and thirty-two polymorphisms were identified in pfmspdbl1 within the SPAM and DBL domains, respectively, whereas pfmspdbl2 presented two polymorphisms across both domains and a 12 bp insertion in the SPAM domain. Tajima's D values were positive across domains, except for the DBL domain of pfmspdbl2 in Mâncio Lima. Fifteen B-cell and fifteen T-cell epitopes were predicted, with polymorphisms in three B-cell epitopes affecting Vaxijen scores. Together, these findings reveal contrasting evolutionary patterns between PfMSPDBL1 and PfMSPDBL2, with potential implications for antigenicity, and highlight PfMSPDBL2 as a potential candidate for further evaluation in multicomponent blood-stage malaria vaccine development.
Genetic diversity↗
Evidence for a relationship between genetic polymorphisms of the L-DOPA transporter LAT2/4F2hc and risk of hypertension in the context of chronic kidney disease.
BACKGROUND: Chronic kidney disease (CKD) and hypertension are chronic diseases affecting a large portion of the population frequently coexistent and interdependent. The inability to produce/use adequate renal dopamine may contribute to the development of hypertension and renal dysfunction. The heterodimeric amino acid transporter LAT2/4F2hc (SLC7A8/SLC3A2 genes) promotes the uptake of L-DOPA, the natural precursor of dopamine. We examined the plausibility that SLC7A8/SLC3A2 gene polymorphisms may contribute to hypertensive CKD by affecting the L-DOPA uptake. METHODS: 421 subjects (203 men and 218 women, mean age of 78.9 ± 9.6 years) were recruited and divided in four groups according to presence/absence of CKD, defined as reduced estimated glomerular filtration rate (eGFR < 60 ml/min/m2) calculated using the creatinine-based Berlin Initiative Study-1 (BIS1) equation, and to presence/absence of hypertension (systolic blood pressure ≥ 140 and/or diastolic blood pressure ≥ 90 mmHg). Subjects were analysed for selected SNPs spanning the SLC7A8 and SLC3A2 loci by Sequenom MassARRAY iPLEX platform. RESULTS: The most significant SNP at the SLC3A2 (4F2hc) locus was rs2282477-T/C, with carriers of the C-allele having a lower chance to develop hypertension among CKD affected individuals [OR = 0.33 (CI 0.14-0.82); p = 0.016]. A similar association with hypertensive CKD was found for the SLC7A8 (LAT2) rs3783436-T/C, whose C-allele resulted associated with decreased risk of hypertension among subjects affected by CKD [OR = 0.56 (95% CI 0.35-0.90; p = 0.017]. The two variants were predicted to be potentially functional. CONCLUSIONS: The association between SLC3A2 and SLC7A8 variants to hypertension development in patients with renal failure could be linked to changes in L-DOPA uptake and consequently dopamine synthesis. Although the associations do not survive correction for Bonferroni multiple testing, and additional research is needed, our study opens new avenues for future basic and translational research in the field of hypertensive CKD.
Aged↗
Human pancreatic amylase polymorphism: formal genetics and population genetics.
The genetically determined polymorphism of human pancreatic amylase (E.C. 3.2.1.1), AMY2, is demonstrated in serum specimens by agarose gel electrophoresis. We investigated 325 mother-child pairs and 2594 unrelated individuals from southwestern Germany. This study confirms the formal hypothesis of two common alleles AMY1/2, AMY2/2 and possibly two rare alleles AMY3/2, AMY4/2 at an autosomal locus AMY2. The frequency of the AMY1/2 allele was calculated as 0.951; AMY3/2 and AMY4/2 seem to have a frequency of 0.001 in this sample.
Alleles↗
[Pathobiochemistry of alcoholism].
Liver alcohol dehydrogenase (ADH) represents the main enzyme of normal alcohol metabolism. Total activity of this enzyme varies largely due to the occurrence of isoenzymes and of genetic polymorphisms. One genetic variant, called "atypical", is characterized by a higher specific activity. In carriers of this variant enzyme an initially faster rate of ethanol metabolism leads to higher blood acetaldehyde levels. Acetaldehyde, as a toxic intermediary metabolite, causes tachycardia, nausea and flushing of the face. A high frequency for "atypical" ADH is observed in mongolid races and consequently a hypersensitivity to alcohol is often observed in Orientals. Hence, certain genetically determined enzyme patterns may represent an aversive factor with regard to alcohol consumption. In Caucasians the phenotypes with "atypical" ADH are less frequent. However, in individuals with the "atypical" variant regular intake of alcohol may lead to an increased organotoxicity due to acetaldehyde.
Acetaldehyde↗
Polymorphism of apolipoprotein E. II. Genetics of hyperlipoproteinemia type III.
Apolipoprotein E from human serum shows a genetic polymorphism determined by two autosomal codominant alleles, Apo En and Apo Ed. Homozygosity for the gene Apo Ed (phenotype Apo E-D) results in primary dysbetalipoproteinemia, but only some individuals with this phenotype develop gross hyperlipidemia (hyperlipoproteinemia type III). Vertical transmission of dysbetalipoproteinemia represents pseudodominance due to the high frequency of the gene Apo Ed. Dysbetalipoproteinemia is already expressed in childhood. To assess the influence of other genes on the expression of hyperlipidemia in phenotype Apo E-D, comparative studies were carried out in kindreds of hypercholesterolemic (group A) and normo- or hypocholesterolemic probands with dysbetalipoproteinemia (group B). This demonstrated the occurrence of familial (non-type III) forms of hyperlipidemia in group A but not in group B kindreds. Distribution of lipoprotein phenotypes in five of the group A kindreds was consistent with the occurrence of familial combined hyperlipidemia. Apo E phenotypes and hyperlipidemia segregated independently. It is concluded that primary dysbetalipoproteinemia is a frequent monogenic variant of lipoprotein metabolism, but not a disease. Coincidence in one individual of genes for this specific dyslipoproteinemia with any of the genes for monogenic or polygenic forms of familial hyperlipidemia results in hyperlipoproteinemia type III. Hence hyperlipoproteinemia type III is caused by at least two non-allelic genes and is a polygenic disorder.
Adolescent↗
Whole genome sequencing of Yersinia pestis isolates from Central Asian natural plague foci revealed the role of adaptation to different hosts and environmental conditions in shaping specific genotypes.
The genetic diversity and biovar classification of Yersinia isolates from Central Asia were investigated using whole-genome sequencing. In total, 98 isolates from natural plague foci were sequenced using the MiSeq platform. Computational pipelines were developed for accurate assembly of Y. pestis replicons, including small cryptic plasmids, and for identifying genetic polymorphisms. A panel of 99 diagnostic polymorphisms was established, enabling the distinction of dominant Medievalis isolates derived from desert and upland regions. Evidence of convergent evolution was observed in polymorphic allele distributions across genetically distinct Y. pestis biovars, Y. pseudotuberculosis, and other Y. pestis strains, likely driven by adaptation to similar environmental conditions. Genetic polymorphisms in the napA, araC, ssuA, and rhaS genes, along with transposon and CRISPR-Cas insertion patterns, were confirmed as suitable tools for identifying Y. pestis biovars, although their homoplasy suggests limited utility for phylogenetic inference. Notably, a novel cryptic plasmid, pCKF, previously associated with the strain of the population 2.MED0 from the Central-Caucasus high-altitude autonomous plague focus, was detected in a genetically distinct isolate of 2.MED1 population from the Ural-Embi region, indicating potential plasmid transfer across the 2.MED lineage. These findings emphasize the need for ongoing genomic surveillance to monitor the spread of virulence-associated genetic elements and to improve our understanding of Y. pestis evolution and ecology.
Yersinia pestis↗
Genetic protein polymorphisms in human saliva: an interpretive review.
The purpose of this review is to summarize recent progress in the field of genetic protein polymorphisms found in human saliva since 1972. Prior to 1972 most of the investigations were related to amylase. The genetics of salivary amylase will not be considered here, since it has recently been thoroughly reviewed elsewhere (Merritt and Karn, 1977). In this review, special attention will be devoted to the complex interrelationships of the proline-rich (Pr), double-band (Db), acidic protein (Pa), and peroxidase (SAPX) systems. The biochemically related Pr, Db, and Pa systems show distinctive genetic patterns, and there are associations between the phenotypes indicating linkage relationships. There is also evidence for probable interaction of products of the Pa and SAPX loci. Electrophoretic properties of these proteins can be defined in several gel systems, permitting an accurate definition of phenotypes. The usefulness and limitations of the different gel systems in the interpretation of these electrophoretic patterns will be illustrated. Allelic frequencies of the systems to be discussed are given in Table I. To aid comprehension, the systems will be discussed in logical rather than historical sequence.
Acid Phosphatase↗
The band 3 protein of the human red cell membrane: a review.
Band 3 is the predominant polypeptide and the purported mediator of anion transport in the human erythrocyte membrane. Against a background of minor and apparently unrelated polypeptides of similar electrophoretic mobility, and despite apparent heterogeneity in its glycosylation, the bulk of band 3 exhibits uniform and characteristic behavior. This integral glycoprotein appears to exist as a noncovalent dimer of two approximately 93,000-dalton chains which span the membrane asymmetrically. The protein is hydrophobic in its composition and in its behavior in aqueous solution and is best solubilized and purified in detergent. It can be cleaved while membrane-bound into large, topographically defined segments. An integral, outer-surface, 38,000-dalton fragment bears most of the band 3 carbohydrate. A 17,000-dalton, hydrophobic glycopeptide fragment spans the membrane. A approximately 40,000-dalton hydrophilic segment represents the cytoplasmic domain. In vitro, glyceraldehyde 3-P dehydrogenase and aldolase bind reversibly, in a metabolie-sensitive fashion, to this cytoplasmic segment. The cytoplasmic domain also bears the amino terminus of this polypeptide, in contrast to other integral membrane proteins. Recent electron microscopic analysis suggests that the poles of the band 3 molecule can be seen by freeze-etching at the two original membrane surfaces, while freeze-fracture reveals the transmembrane disposition of band 3 dimer particles. There is strong evidence that band 3 mediates 1:1 anion exchange across the membrane through a conformational cycle while remaining fixed and asymmetrical. Its cytoplasmic pole can be variously perturbed and even excised without a significant alteration of transport function. However, digestion of the outer-surface region leads to inhibition of transport, so that both this segment and the membrane-spanning piece (which is selectively labeled by covalent inhibitors of transport) may be presumed to be involved in transport. Genetic polymorphism has been observed in the structure and immunogenicity of the band 3 polypeptide but this feature has not been related to variation in anion transport or other band 3 activities.
Amino Acids↗
Nucleoside phosphorylase 2 (Np-2) of mice.
Isozyme patterns of nucleoside phosphorylase (NP) in 16 inbred strains, two recombinant inbred, one congenic, and three species of wild mice were studied. Evidence is provided for a genetic locus, Np-2, encoding an electrophoretic variant which is expressed exclusively in erythrocytes of certain inbred strains. This finding establishes the occurrence of genetic polymorphism of NP among inbred strains of mice. In addition, the Npla allele previously reported only in inbred strains has been observed in one of the species of wild mice (Mus musculus castaneus) studied.
Animals↗
Human salivary proline-rich (Pr) proteins: a posttranslational derivation of the phenotypes.
The acidic proline-rich proteins (Pr) showing genetic polymorphism were purified from human parotid salivas by gel filtration and ion exchange chromatography. Molecular weight determinations, amino acid composition analyses, and polypeptide mapping experiments indicate that the Pr 3 protein is a fragment of the Pr 1 protein. Studies of a parotid saliva factor capable of converting Pr 1 to Pr 3 and Pr 2 to Pr 4 indicate that Pr 3 and Pr 4 are generated from Pr 1 and Pr 2, respectively. Evidence suggests that the converting factor is a protease capable of posttranslationally cleaving Pr 1 and Pr 2, the primary or derived products of alleles Pr1 and Pr2.
Amino Acids↗
Tryptic and elastolytic inhibitory capacities of serum from various Pi phenotypes.
Alpha-1-antitrypsin deficiency is responsible for emphysema in adults. The genetic polymorphism of this protein (Pi system) is used to detect these deficiencies. The relationship between the serum protease inhibitory capacities and M, MZ and Z Pi phenotypes was investigated. 120 sera including 31 M, 33 MZ and 56 Z were studied. The alpha-1-antitrypsin concentration varied according to the Pi phenotype, the sex and the health of the subject. The alpha-2-macroglobulin level did not depend on the Pi phenotype. The trypsin inhibitory capacity fluctuated with the age and the health of the subject, but did not faithfully represent the Pi phenotype. In contrast, the elastase inhibitory capacity depended only on the Pi phenotype. The relationship between alpha-1-antitrypsin levels and the serum elastase inhibitory capacities was linear. Canonical analysis was employed to determine the relative contributions of each antiprotease to the two inhibitory capacities. It appeared that the elastase inhibitory capacity was influenced more by the alpha-1-antitrypsin level while the trypsin inhibitory capacity was more sensitive to alpha-2-macroglobulin.
Adult↗
Red cell uridine monophosphate kinase: effects of red cell aging on the activity of two UMPK gene products.
We have previously reported that uridine monophosphate kinase (UMPK) is genetically polymorphic in man, and that the UMPK2 gene product has less activity than that of UMPK1 when measured in normal red cells. In this paper we present evidence that the activity of UMPK, like that of many other enzymes, declines during red cell aging, and that the lower activity of UMPK 2, as compared with UMPK 1, is best explained by its more rapid catabolism.
Erythrocyte Aging↗
[The use of the erythrocyte adenylate kinase system in paternity suits].
Authors describe genetically determined polymorphisms, genetical feature and pattern of inheritance of the system of AK. Results and methods used in their studies first in the Hungarian population are reported. On the basis of examination of 1734 persons the incidence of the AK phenotypes was found as follows: AK 1 = 93,59%, AK 2 = 0,05%, and AK 2-1 6,34%. Values of gene frequency: AK1-0,9676, AK2-0,0322. According to the authors findings the maximal (theoretical) chance of the exclusion of paternity on the basis of AK system was 3,02%. In 844 cases of discussed paternity beside the investigation of the systems of A1A2BO, MN, Hp, Rh, Gm/a, x, b), InV(1), Gc, Ss, Kk, Fy(ab), VSP, PGM1, GPT and ADA the system of AK was also studied. In 191 cases (22,62%) the paternity could have been excluded. In 8 cases (0,94%) exclusion of the paternity have been based on the findings of the examination of AK system. In cases of discussed paternity authors recommend the examination of the AK system.
Adenylate Kinase↗
[Gene dosage and chromosome enzymatic markers].
Data are tabulated on the number of nomenclature current abbreviations, the occurence of multiple gene loci and corresponding polypeptide chains, and chromosomal assignment of 114 enzymes. Gene dose effect measurement is dependent upon several properties of the enzyme which are also listed: tissue and subcellular distribution, subunit number, interloci hybrids, genetic polymorphism, qualitative and quantitative methods of detection. The possibilities and limits of the concept of a gene-dose relationship, for the detection of carriers of chromosomal aberrations, and also for chromosomal assignment are discussed.
Chromosome Mapping↗