The world's scientific and social network for malaria professionals
Subscribe to free Newsletter | 11148 malaria professionals are enjoying the free benefits of MalariaWorld today


Genetic polymorphism of the extracellular region in surface associated interspersed 1.1 gene of Plasmodium falciparum field isolates from Thailand

August 18, 2021 - 16:27 -- Open Access
Natpasit Chaianantakul, Tippawan Sungkapong, Jirapinya Changpad, Keawalin Thongma, Sasiwimon Sim-ut and Morakot Kaewthamasorn
Malaria Journal 2021 20:343, 16 August 2021

A novel variable surface antigens (VSAs), Surface-associated interspersed proteins (SUFRINs), is a protein that is modified on the surface of infected red blood cell (iRBC). Modified proteins on the iRBC surface cause severe malaria, which can lead to death throughout the life cycle of a malaria parasite. Previous study suggested that SURFIN1.1 is an immunogenic membrane-associated protein which was encoded by using the surf1.1 gene expressed during the trophozoite and schizont stages. This study aimed to identify the regions of SURFIN1.1 and investigate the genetic diversity of the extracellular region of the surf1.1 gene.

Chloroquine and Hydroxychloroquine Interact Differently with ACE2 Domains Reported to Bind with the Coronavirus Spike Protein: Mediation by ACE2 Polymorphism

February 2, 2021 - 16:25 -- Open Access
Badraoui R, Adnan M, Bardakci F, Alreshidi MM
Molecules. 2021 Jan 28;26(3):673

The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection inducing coronavirus disease 2019 (COVID-19) is still an ongoing challenge. To date, more than 95.4 million have been infected and more than two million deaths have been officially reported by the WHO. Angiotensin-converting enzyme (ACE) plays a key role in the disease pathogenesis.

Three signatures of adaptive polymorphism exemplified by malaria-associated genes

November 18, 2020 - 10:58 -- Open Access
Tennessen JA, Duraisingh MT
Mol Biol Evol. 2020 Nov 13:msaa294

Malaria has been one of the strongest selective pressures on our species. Many of the best-characterized cases of adaptive evolution in humans are in genes tied to malaria resistance. However, the complex evolutionary patterns at these genes are poorly captured by standard scans for non-neutral evolution. Here we present three new statistical tests for selection based on population genetic patterns that are observed more than once among key malaria resistance loci.

Genetic polymorphism of vir genes of Plasmodium vivax in Myanmar

November 4, 2020 - 15:18 -- Open Access
Na BK, Kim TS, Lin K, Baek MC, Chung DI, Hong Y, Goo YK
Parasitol Int. 2020 Oct 31:102233

The Plasmodium vivax variant proteins encoded by vir genes are highly polymorphic antigens and are considered as one of key proteins of P. vivax for host immune evasion via antigenic variations. Because genetic diversity of these antigens is a critical hurdle in the development of an effective vaccine, understanding the genetic nature of the vir genes in natural population is important.

Population genetic and biophysical evidences reveal that purifying selection shapes the genetic landscape of Plasmodium falciparum RH ligands in Chhattisgarh and West Bengal, India

October 15, 2020 - 08:19 -- Open Access
Sharmistha Ghoshal, Pramita Chowdhury, Sanhita Ray, Mitashree Mitra, Sumana Datta Kanjilal, Srikanta Sen, Anjan Kr. Dasgupta and Sanghamitra Sengupta
Malaria Journal 2020 19:367,14 October 2020

Reticulocyte binding protein-like homologs (RHs) are currently being evaluated as anti-erythrocytic stage vaccine targets against Plasmodium falciparum malaria. Present study explores the possible evolutionary drivers shaping the genetic organization of Pfrhs in Indian parasite population. It simultaneously evaluates a putative gain-of-function variant of PfRH5, a keystone member of PfRH family.

Single-nucleotide polymorphism characterization of gametocyte development 1 gene in Plasmodium falciparum isolates from Baringo, Uasin Gishu, and Nandi Counties, Kenya

March 17, 2020 - 15:12 -- Open Access
Bungei JK, Mobegi VA, Nyanjom SG
Heliyon. 2020 Mar 3; 6(3):e03453

Plasmodium falciparum relies on gametocytogenesis to transmit from humans to mosquitoes. Gametocyte development 1 (Pfgdv1) is an upstream activator and epigenetic controller of gametocytogenesis. The emergence of drug resistance is a major public health concern and this requires the development of new strategies that target the transmission of malaria. As a putative drug target, Pfgdv1 has not been characterized to identify its polymorphisms and alleles under selection and how such polymorphisms influence protein structure.

NOT Open Access | MiRNA-146a Polymorphism Was Not Associated with Malaria in Southern India

March 9, 2020 - 14:35 -- NOT Open Access
van Loon W, Gai PP, Kulkarni SS, Rasalkar R, Siegert K, Wedam J, Boloor A, Baliga S, Kumar A, Jain A, Mahabala C, Shenoy D, Devi R, Gai P, Mockenhaupt FP
Am J Trop Med Hyg. 2020 Mar 2

Micro-RNAs (miRNAs) play a crucial role in immune regulation, and a common miRNA-146a polymorphism (rs2910164) increased the odds of falciparum malaria in pregnant African women. Here, we examined whether this association holds true in a different population, that is, 449 mainly male and adult malaria patients and 666 community controls in southwestern India. Plasmodium vivax malaria (67%) predominated over falciparum malaria (11%) and mixed species infections (22%).

Analysis of Plasmodium falciparum Rh2b deletion polymorphism across different transmission areas

February 11, 2020 - 15:51 -- Open Access
Yaw Aniweh, Jonathan Suurbaar, Gordon A. Awandare, et al.
Sci Rep. 2020; 10:1498.

Despite significant progress in controlling malaria, the disease remains a global health burden. The intricate interactions the parasite Plasmodium falciparum has with its host allows it to grow and multiply in human erythrocytes. The mechanism by which P. falciparum merozoites invade human erythrocytes is complex, involving merozoite proteins as well as erythrocyte surface proteins. Members of the P. falciparum reticulocyte binding-like protein homolog (PfRh) family of proteins play a pivotal role in merozoite invasion and hence are important targets of immune responses.

NOT Open Access | MHC Class II (DRB) Promoter Polymorphism and Its Role in Parasite Control among Malaria Patients

January 27, 2020 - 13:21 -- NOT Open Access
Sar P, Agarwal A, Vadodariya DH, Kariya H, Khuman J, Dalai S
J Immunol January 15, 2020, ji1900558

MHC class II (MHCII) molecules are cell surface glycoproteins that play an important role to develop adaptive immune responses. MHCII-disease association is not restricted to structural variation alone but also may extend to genetic variations, which may modulate gene expression. The observed variations in class II gene expression make it possible that the association of MHCII polymorphism with diseases may relate to the level of gene expression in addition to the restriction of response to Ag.

NOT Open Access | Polymorphism and natural selection in the merozoite surface protein 3F2 (PVX_97710) locus of Plasmodium vivax among field isolates

November 12, 2019 - 15:56 -- NOT Open Access
Napaporn Kuamsab, Chaturong Putaporntip, Somchai Jongwutiwes
Infection, Genetics and Evolution, November 2019, 104058

Plasmodium vivax, the chronic relapsing human malaria parasite with the most widespread distribution, possesses proteins associated with the merozoite surface that could be targets for host immune responses and potential vaccine candidates. Of these, the merozoite surface protein 3 of P. vivax (PvMSP3) is an attractive vaccine target as well as a genetic marker for epidemiological surveillance.

Subscribe to RSS - polymorphism