Displaying publications 1 - 20 of 8266 in total

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  1. The incidence of anencephaly in a polytypic population
    Searle AG
    Ann. Hum. Genet., 1959;23:279-288.
    DOI: 10.1111/j.1469-1809.1959.tb01471.x
    1. The incidence of anencephaly in Singapore was determined from hospital records for 1953–56 inclusive. Sixty‐eight cases were found in 88,069 births, or 0.77 per thousand. 2. Analysis of data according to maternal community revealed great heterogeneity (Table 1), with frequencies ranging from 0.0 per thousand in the Hakka group of Chinese to 6.5 per thousand in Sikhs. 3. 48.4 % of anencephalics were males. This unusually high proportion may be connected with the low frequency of primiparity in Singapore and high average birth weight of affected infants, compared with records from elsewhere. Neither maternal age nor parity had a significant effect on the incidence. 4. The causes of anencephaly are discussed. It is suggested that properties of the local external environment (such as type of water supply) are of less importance than dietary and other customs peculiar to different communities, as well as genetical differences. 5. Several reasons are given why anencephaly, and other congenital malformations of the central nervous system, should be regarded as quasi‐continuous variables, due to a threshold effect. A comparison with the ‘curly‐tail’ mutant in the mouse supports this view and also emphasizes the close causal connexion between anencephaly and spina bifida. I am very grateful to Prof. L. S. Penrose, F.R.S., for arousing my interest in this subject and for invaluable advice. I should like to thank Prof. B. H. Sheares, Head of the University of Malaya's Unit at Kandang Kerbau Hospital, and Dr A. Arulanandam, Medical Superintendent, for arranging that I should have access to hospital records. I am greatly indebted to my wife for considerable help in the task of searching through these records. Copyright © 1959, Wiley Blackwell. All rights reserved
    Matched MeSH terms: Genetics
  2. Human genetics and the practice of medicine
    Wong HB
    Family Practitioner, 1986;9:25-34.
    Matched MeSH terms: Genetics
  3. Principles and scope of population genetics in the study of vector mosquitoes
    Yong HS
    Southeast Asian J Trop Med Public Health, 1988 Dec;19(4):657-9.
    PMID: 3070769
    Matched MeSH terms: Anopheles/genetics; Genetics, Population*; Insect Vectors/genetics*
  4. Fulltext Huntingtin and Other Neurodegeneration-Associated Proteins in the Development of Intracellular Pathologies: Potential Target Search for Therapeutic Intervention
    Churkina Taran AS, Shakhov AS, Kotlobay AA, Alieva IB
    Int J Mol Sci, 2022 Dec 08;23(24).
    PMID: 36555175 DOI: 10.3390/ijms232415533
    Neurodegenerative diseases are currently incurable. Numerous experimental data accumulated over the past fifty years have brought us closer to understanding the molecular and cell mechanisms responsible for their development. However, these data are not enough for a complete understanding of the genesis of these diseases, nor to suggest treatment methods. It turns out that many cellular pathologies developing during neurodegeneration coincide from disease to disease. These observations give hope to finding a common intracellular target(s) and to offering a universal method of treatment. In this review, we attempt to analyze data on similar cellular disorders among neurodegenerative diseases in general, and polyglutamine neurodegenerative diseases in particular, focusing on the interaction of various proteins involved in the development of neurodegenerative diseases with various cellular organelles. The main purposes of this review are: (1) to outline the spectrum of common intracellular pathologies and to answer the question of whether it is possible to find potential universal target(s) for therapeutic intervention; (2) to identify specific intracellular pathologies and to speculate about a possible general approach for their treatment.
    Matched MeSH terms: Huntingtin Protein/genetics
  5. Signatures of purifying selection and site-specific positive selection on the mitochondrial DNA of dromedary camels (Camelus dromedarius)
    Bahbahani H, Al-Zoubi S, Ali F, Afana A, Dashti M, Al-Ateeqi A, et al.
    Mitochondrion, 2023 Mar;69:36-42.
    PMID: 36690316 DOI: 10.1016/j.mito.2023.01.004
    The two species of the Old World Camelini tribe, dromedary and Bactrian camels, show superior adaptability to the different environmental conditions they populate, e.g. desert, mountains and coastal areas, which might be associated with adaptive variations on their mitochondrial DNA. Here, we investigate signatures of natural selection in the 13-mitochondrial protein-coding genes of different dromedary camel populations from the Arabian Peninsula, Africa and southwest Asia. The full mitogenome sequences of 42 dromedaries, 38 domestic Bactrian, 29 wild Bactrian camels and 31 samples representing the New World Lamini tribe reveal species-wise genetic distinction among Camelidae family species, with no evidence of geographic distinction among dromedary camels. We observe gene-wide signals of adaptive divergence between the Old World and New World camels, with evidence of purifying selection among Old World camel species. Upon comparing the different Camelidae tribes, 27 amino acid substitutions across ten mtDNA protein-coding genes were found to be under positive selection, in which, 24 codons were defined to be under positive adaptive divergence between Old World and New World camels. Seven codons belonging to three genes demonstrated positive selection in dromedary lineage. A total of 89 codons were found to be under positive selection in Camelidae family based on investigating the impact of amino acid replacement on the physiochemical properties of proteins, including equilibrium constant and surrounding hydrophobicity. These mtDNA variants under positive selection in the Camelidae family might be associated with their adaptation to their contrasting environments.
    Matched MeSH terms: Mitochondria/genetics
  6. Isolation, identification and characterisation of Pseudomonas koreensis CM-01 isolated from diseased Malaysian mahseer (Tor tambroides)
    Lau MML, Kho CJY, Chung HH, Zulkharnain A
    Fish Shellfish Immunol, 2024 May;148:109518.
    PMID: 38513913 DOI: 10.1016/j.fsi.2024.109518
    Pseudomonas species are one of the most threatening fish pathogens which reside a wide range of environments. In this study, the dominant bacteria were isolated from diseased Malaysian mahseer (Tor tambroides) and tentatively named CM-01. It was identified as Pseudomonas koreensis based on its biochemical, morphological, genetic and physiological information. Its pathogenicity was found to be correlated with twelve virulence genes identified including iron uptake, protease, acylhomoserine lactone synthase gacS/gacA component regulation system, type IV secretion system, hydrogen cyanide production, exolysin, alginate biosynthesis, flagella and pili. The median lethal dose (LD50) for the CM-01 isolate on Malaysian mahseer was documented at 5.01 × 107 CFU/mL. The experimental infection revealed that CM-01 led to significant histological lesions in the fish, ultimately resulting in death. These lesions comprise necrosis, tissue thickening and aggregation. Drug sensitivity tests had shown its susceptibility to beta-lactam combination agents and further suggest its drug of choice. Its growing features had shown its growth at optimal temperature and pH. To the best of our knowledge, this is the first report of P. koreensis linked to diseased T. tambroides. STATEMENT OF RELEVANCE: In this research, a novel strain of Pseudomonas koreensis, CM-01 was isolated from diseased T. tambroides for the first time. The antimicrobial susceptibility, pathogenicity, virulence genes and growth characteristics of CM-01 were studied. These findings established a scientific foundation for the recognition of P. koreensis and the management of fish infections caused by this pathogen.
    Matched MeSH terms: Pseudomonas/genetics
  7. Fulltext DNA Barcoding, Phylogenetic Analysis and Secondary Structure Predictions of Nepenthes ampullaria, Nepenthes gracilis and Nepenthes rafflesiana
    Saidon NA, Wagiran A, Samad AFA, Mohd Salleh F, Mohamed F, Jani J, et al.
    Genes (Basel), 2023 Mar 11;14(3).
    PMID: 36980969 DOI: 10.3390/genes14030697
    Nepentheceae, the most prominent carnivorous family in the Caryophyllales order, comprises the Nepenthes genus, which has modified leaf trap characteristics. Although most Nepenthes species have unique morphologies, their vegetative stages are identical, making identification based on morphology difficult. DNA barcoding is seen as a potential tool for plant identification, with small DNA segments amplified for species identification. In this study, three barcode loci; ribulose-bisphosphate carboxylase (rbcL), intergenic spacer 1 (ITS1) and intergenic spacer 2 (ITS2) and the usefulness of the ITS1 and ITS2 secondary structure for the molecular identification of Nepenthes species were investigated. An analysis of barcodes was conducted using BLASTn, pairwise genetic distance and diversity, followed by secondary structure prediction. The findings reveal that PCR and sequencing were both 100% successful. The present study showed the successful amplification of all targeted DNA barcodes at different sizes. Among the three barcodes, rbcL was the least efficient as a DNA barcode compared to ITS1 and ITS2. The ITS1 nucleotide analysis revealed that the ITS1 barcode had more variations compared to ITS2. The mean genetic distance (K2P) between them was higher for interspecies compared to intraspecies. The results showed that the DNA barcoding gap existed among Nepenthes species, and differences in the secondary structure distinguish the Nepenthes. The secondary structure generated in this study was found to successfully discriminate between the Nepenthes species, leading to enhanced resolutions.
    Matched MeSH terms: DNA, Plant/genetics
  8. Fulltext Heritable variation in swimming performance in Nile tilapia (Oreochromis niloticus) and negative genetic correlations with growth and harvest weight
    Mengistu SB, Palstra AP, Mulder HA, Benzie JAH, Trinh TQ, Roozeboom C, et al.
    Sci Rep, 2021 May 26;11(1):11018.
    PMID: 34040080 DOI: 10.1038/s41598-021-90418-w
    Nile tilapia is predominantly produced in smallholder ponds without aeration. We hypothesize that Nile tilapia with high oxygen uptake efficiency (O2UE) may perform better under these conditions than Nile tilapia with low O2UE. Critical swimming speed (Ucrit, in cm s-1) is a potential indicator for O2UE. Our objectives were to estimate variance components for Ucrit and fish size at swim testing early in life, and genetic correlations (rg) between Ucrit with harvest weight (HW) and daily growth coefficient (DGC) later after grow-out in a non-aerated pond. Substantial heritability was found for absolute Ucrit (0.48). The estimated rg between absolute Ucrit and fish size at testing were all strong and positive (range 0.72-0.83). The estimated rg between absolute Ucrit and HW, and absolute Ucrit and DGC were - 0.21 and - 0.63 respectively, indicating that fish with higher absolute Ucrit had lower growth in the non-aerated pond as compared to fish with lower absolute Ucrit. These results suggest a juvenile trade-off between swimming and growth performance where fish with high Ucrit early in life show slower growth later under conditions of limited oxygen availability. We conclude that Ucrit in Nile tilapia is heritable and can be used to predict growth performance.
    Matched MeSH terms: Oxygen Consumption/genetics
  9. Human papilloma virus 18 detection in oral squamous cell carcinoma and potentially malignant lesions using saliva samples
    Goot-Heah K, Kwai-Lin T, Froemming GR, Abraham MT, Nik Mohd Rosdy NM, Zain RB
    Asian Pac J Cancer Prev, 2012;13(12):6109-13.
    PMID: 23464414
    BACKGROUND: Oral cancer has become one of the most prevalent cancers worldwide and human Papillomavirus is one of the risk factors for developing oral cancer. For this study HPV18 was chosen as it is one of the high risk HPV types and may lead to carcinogenesis. However, prevalence of HPV18 infection in Oral Squamous Cell Carcinoma in Malaysia remains unclear.

    OBJECTIVE: This study aimed to investigate the viral load of HPV18 DNA in OSCC and potentially malignant lesions using saliva samples.

    MATERIALS AND METHODS: Genomic DNAs of thirty saliva samples of normal subjects and thirty saliva samples compromised of 16 samples from potentially malignant lesions and 14 of OSCC patients were amplified for HPV18 DNA using a nested polymerase chain reaction analysis. All PCR products were then analyzed using the Bioanalyzer to confirm presence of HPV18 DNA.

    RESULT: From thirty patients examined, only one of 30 (3.3%) cases was found to be positive for HPV18 in this study.

    CONCLUSION: The finding of this study revealed that there is a low viral detection of HPV18 in Malaysian OSCC by using saliva samples, suggesting that prevalence of HPV18 may not be important in this group of Malaysian OSCC.

    Matched MeSH terms: DNA, Viral/genetics; Mouth Neoplasms/genetics; Papillomaviridae/genetics
  10. Letter regarding Xiao WZ et al. entitled "Relationships between PTEN gene mutations and prognosis in glioma: a meta-analysis"
    Dai W, Chen J, Guo X, Su Z
    Tumour Biol., 2015 Jun;36(6):4089.
    PMID: 26025112 DOI: 10.1007/s13277-015-3481-4
    With great interest, we read the article "Relationships between PTEN gene mutations and prognosis in glioma: a meta-analysis" (by Xiao et al. Tumor Biol 35(7):6687-6693, 2014), which has reached important conclusions that the phosphatase and tensin homolog (PTEN) gene mutations were closely related to poor prognosis of glioma patients. Through quantitative analysis, the investigators (Xiao WZ et al.) showed that glioma patients with PTEN gene mutations exhibited a significantly shorter overall survival (OS) than those without PTEN gene mutations (HR = 3.66, 95 % CI = 2.02∼5.30, P  0.05). The meta-analysis results are encouraging. Nevertheless, some deficiencies still existed that we would like to raise.
    Matched MeSH terms: Brain Neoplasms/genetics*; Glioma/genetics*; PTEN Phosphohydrolase/genetics*
  11. Fulltext Whole mitochondrial genome sequencing of Malaysian patients with cardiomyopathy
    Kuan SW, Chua KH, Tan EW, Tan LK, Loch A, Kee BP
    PeerJ, 2022;10:e13265.
    PMID: 35441061 DOI: 10.7717/peerj.13265
    Cardiomyopathy (CMP) constitutes a diverse group of myocardium diseases affecting the pumping ability of the heart. Genetic predisposition is among the major factors affecting the development of CMP. Globally, there are over 100 genes in autosomal and mitochondrial DNA (mtDNA) that have been reported to be associated with the pathogenesis of CMP. However, most of the genetic studies have been conducted in Western countries, with limited data being available for the Asian population. Therefore, this study aims to investigate the mutation spectrum in the mitochondrial genome of 145 CMP patients in Malaysia. Long-range PCR was employed to amplify the entire mtDNA, and whole mitochondrial genome sequencing was conducted on the MiSeq platform. Raw data was quality checked, mapped, and aligned to the revised Cambridge Reference Sequence (rCRS). Variants were named, annotated, and filtered. The sequencing revealed 1,077 variants, including 18 novel and 17 CMP and/or mitochondrial disease-associated variants after filtering. In-silico predictions suggested that three of the novel variants (m.8573G>C, m.11916T>A and m.11918T>G) in this study are potentially pathogenic. Two confirmed pathogenic variants (m.1555A>G and m.11778G>A) were also found in the CMP patients. The findings of this study shed light on the distribution of mitochondrial mutations in Malaysian CMP patients. Further functional studies are required to elucidate the role of these variants in the development of CMP.
    Matched MeSH terms: DNA, Mitochondrial/genetics; Mitochondria/genetics; Mutation/genetics
  12. Fulltext Changes in Mitochondrial Epigenome in Type 2 Diabetes Mellitus
    Low HC, Chilian WM, Ratnam W, Karupaiah T, Md Noh MF, Mansor F, et al.
    Br J Biomed Sci, 2023;80:10884.
    PMID: 36866104 DOI: 10.3389/bjbs.2023.10884
    Type 2 Diabetes Mellitus is a major chronic metabolic disorder in public health. Due to mitochondria's indispensable role in the body, its dysfunction has been implicated in the development and progression of multiple diseases, including Type 2 Diabetes mellitus. Thus, factors that can regulate mitochondrial function, like mtDNA methylation, are of significant interest in managing T2DM. In this paper, the overview of epigenetics and the mechanism of nuclear and mitochondrial DNA methylation were briefly discussed, followed by other mitochondrial epigenetics. Subsequently, the association between mtDNA methylation with T2DM and the challenges of mtDNA methylation studies were also reviewed. This review will aid in understanding the impact of mtDNA methylation on T2DM and future advancements in T2DM treatment.
    Matched MeSH terms: DNA, Mitochondrial/genetics; Mitochondria/genetics; Epigenesis, Genetic/genetics
  13. A link between long non-coding RNA (lncRNA) and thalassaemia: A review
    Sumera A, Radhakrishnan AK, Aziz Baba A, George E
    Malays J Pathol, 2020 Dec;42(3):323-332.
    PMID: 33361713
    The long non-coding RNAs (lncRNAs) are the most prevalent and functionally diverse member of the non-coding RNA (ncRNA). The lncRNA has previously been considered to be a form of transcriptional "noise" but recent studies have found that the lncRNA to be associated with various disease conditions. It has also been found to play important roles in various physiological processes such as haemopoiesis, where lncRNA is reported to act as a fine-tuner of this very important process. To date, the effects of dysregulated lncRNA in thalassaemia has not been fully explored. This review article focuses on the possible roles of dysregulated lncRNAs in the pathogenesis of thalassaemia.
    Matched MeSH terms: Thalassemia/genetics*; RNA, Long Noncoding/genetics*
  14. Covid-19 variants: Impact on transmissibility and virulence
    Malik YA
    Malays J Pathol, 2022 Dec;44(3):387-396.
    PMID: 36591708
    The genetic evolution of SARS-CoV-2 began in February 2020, with G614 spike protein strains superseding D614 strains globally. Since then with each subsequent mutations, the SARS-CoV-2 variants of concern, namely Alpha, Beta, Gamma, Delta and Omicron, superseded the previous one to become the dominant strain during the pandemic. By the end of November 2022, the Omicron variant and its descendent lineages account for 99.9% of sequences reported globally. All five VOCs have mutations located in the RBD of the spike protein, resulting in increased affinity of the spike protein to the ACE2 receptors resulting in enhanced viral attachment and its subsequent entry into the host cells. In vitro studies showed the mutations in spike protein help increase the viral fitness, enhancing both transmissibility and replication. In general, Alpha, Beta, Gamma, and Delta variants, were reported with higher transmissibility of 43-90%, around 50%, 170-240%, or 130-170% than their co-circulating VOCs, respectively. The Omicron however was found to be 2.38 times and 3.20 times more transmissible than Delta among the fully-vaccinated and boostervaccinated households. Even the SARS-Cov-2 Omicron subvariants appear to be inherently more transmissible than the ones before. With the broader distribution, enhanced evasion, and improved transmissibility, SARS-CoV-2 variants infection cause severe diseases due to immune escape from host immunity and faster replication. Reports have shown that each subsequent VOC, except Omicron, cause increased disease severity compared with those infected with other circulating variants. The Omicron variant infection however, appears to be largely associated with a lower risk of hospitalisation, ICU admission, mechanical ventilation, and even a shorter length of hospital stay. It has been shown that the relatively much slower replication of the Omicron variants in the lung, resulted in a less severe disease.
    Matched MeSH terms: Virulence/genetics; Spike Glycoprotein, Coronavirus/genetics
  15. Fulltext Development and characterization of microsatellite markers for population genetics of the cocoa pod borer Conopomorpha cramerella (Snellen) (Lepidoptera: Gracillaridae)
    Purificacion M, Shah RBM, De Meeûs T, Bakar SB, Savantil AB, Yusof MM, et al.
    PLoS One, 2024;19(4):e0297662.
    PMID: 38603675 DOI: 10.1371/journal.pone.0297662
    The cocoa pod borer (CPB) Conopomorpha cramerella (Snellen) (Lepidoptera: Gracillaridae) is one of the major constraints for cocoa production in South East Asia. In addition to cultural and chemical control methods, autocidal control tactics such as the Sterile Insect Technique (SIT) could be an efficient addition to the currently control strategy, however SIT implementation will depend on the population genetics of the targeted pest. The aim of the present work was to search for suitable microsatellite loci in the genome of CPB that is partially sequenced. Twelve microsatellites were initially selected and used to analyze moths collected from Indonesia, Malaysia, and the Philippines. A quality control verification process was carried out and seven microsatellites found to be suitable and efficient to distinguish differences between CPB populations from different locations. The selected microsatellites were also tested against a closely related species, i.e. the lychee fruit borer Conopomorpha sinensis (LFB) from Vietnam and eight loci were found to be suitable. The availability of these novel microsatellite loci will provide useful tools for the analysis of the population genetics and gene flow of these pests, to select suitable CPB strains to implement the SIT.
    Matched MeSH terms: Genetics, Population; Microsatellite Repeats/genetics
  16. Differentiation of osteoblasts: the links between essential transcription factors
    Khotib J, Marhaeny HD, Miatmoko A, Budiatin AS, Ardianto C, Rahmadi M, et al.
    J Biomol Struct Dyn, 2023 Nov;41(19):10257-10276.
    PMID: 36420663 DOI: 10.1080/07391102.2022.2148749
    Osteoblasts, cells derived from mesenchymal stem cells (MSCs) in the bone marrow, are cells responsible for bone formation and remodeling. The differentiation of osteoblasts from MSCs is triggered by the expression of specific genes, which are subsequently controlled by pro-osteogenic pathways. Mature osteoblasts then differentiate into osteocytes and are embedded in the bone matrix. Dysregulation of osteoblast function can cause inadequate bone formation, which leads to the development of bone disease. Various key molecules are involved in the regulation of osteoblastogenesis, which are transcription factors. Previous studies have heavily examined the role of factors that control gene expression during osteoblastogenesis, both in vitro and in vivo. However, the systematic relationship of these transcription factors remains unknown. The involvement of ncRNAs in this mechanism, particularly miRNAs, lncRNAs, and circRNAs, has been shown to influence transcriptional factor activity in the regulation of osteoblast differentiation. Here, we discuss nine essential transcription factors involved in osteoblast differentiation, including Runx2, Osx, Dlx5, β-catenin, ATF4, Ihh, Satb2, and Shn3. In addition, we summarize the role of ncRNAs and their relationship to these essential transcription factors in order to improve our understanding of the transcriptional regulation of osteoblast differentiation. Adequate exploration and understanding of the molecular mechanisms of osteoblastogenesis can be a critical strategy in the development of therapies for bone-related diseases.Communicated by Ramaswamy H. Sarma.
    Matched MeSH terms: Cell Differentiation/genetics; Osteogenesis/genetics
  17. Fulltext Morpho-anatomical characterization and DNA barcoding of Artemesia vulgaris L
    Wahyuni DK, Indriati DT, Ilham M, Murtadlo AAA, Purnobasuki H, Junairiah, et al.
    Braz J Biol, 2024;84:e278393.
    PMID: 38422290 DOI: 10.1590/1519-6984.278393
    Artemisia vulgaris L. belongs to Asteraceae, is a herbal plant that has various benefits in the medical field, so that its use in the medical field can be explored optimally, the plant must be thoroughly identified. This study aims to identify A. vulgaris both in terms of descriptive morpho-anatomy and DNA barcoding using BLAST and phylogenetic tree reconstruction. The morpho-anatomical character was observed on root, stem, and leaf. DNA barcoding analysis was carried out through amplification and alignment of the rbcL and matK genes. All studies were conducted on three samples from Taman Husada (Medicinal Plant Garden) Graha Famili Surabaya, Indonesia. The anatomical slide was prepared by the paraffin method. Morphological studies revealed that the leaves of A. vulgaris both on the lower-middle part and on the upper part of the stem have differences, especially in the character of the stipules, petioles, and incisions they have. Meanwhile, from the study of anatomy, A. vulgaris has an anomocytic type of stomata and its distribution is mostly on the ventral part of the leaves. Through the BLAST process and phylogenetic tree reconstruction, the plant sequences being studied are closely related to several species of the genus Artemisia as indicated by a percentage identity above 98% and branch proximity between taxa in the reconstructed phylogenetic tree.
    Matched MeSH terms: Plant Leaves/genetics; DNA, Plant/genetics
  18. PpBZR1, a BES/BZR transcription factor, enhances cold stress tolerance by suppressing sucrose degradation in peach fruit
    Zhang S, Cao K, Wei Y, Jiang S, Ye J, Xu F, et al.
    Plant Physiol Biochem, 2023 Sep;202:107972.
    PMID: 37611487 DOI: 10.1016/j.plaphy.2023.107972
    Brassinosteroids (BRs) are phytohormones that play numerous roles in a plant's response to environmental stress. While BES/BZR transcription factors are essential components in BR signaling, their role in regulating postharvest fruit responses to cold stress is largely unknown. In this study, the application of 24-epibrassinolide (EBR) to peaches alleviated chilling injury (CI) during postharvest cold storage. We further characterized a key BES/BZR gene, PpBZR1, which regulates peach cold resistance. Transient expression PpBZR1 in peaches showed that PpBZR1 inhibits PpVIN2 expression and VIN activity, resulting in an elevated level of sucrose, which protects fruit from CI. Arabidopsis thaliana expressing PpBZR1 that had a high germination and seedling survival rate at low temperatures, which may be due to higher level of sucrose and lower oxidative damage. Mechanistically, we confirmed that PpBZR1 directly binds to the PpVIN2 promoter and functions as a negative regulator for sucrose metabolism. In addition, PpCBF1/5/6 were induced by EBR treatment and AtCBFs were upregulated in PpBZR1 transgenic Arabidopsis thaliana. Combined with previous findings, we hypothesize that PpBZR1 regulates PpVIN2 and may also be mediated by CBF. In conclusion, PpBZR1 expression is induced by EBR treatment during cold storage, which futher inhibite sucrose degradation gene PpVIN2 transcription via direct binding its promoter and indirectly regulating PpVIN2, resulting in slower sucrose degradation and higher chilling tolerance of peach.
    Matched MeSH terms: Fruit/genetics; Transcription Factors/genetics
  19. Fulltext An ecological transcriptome approach to capture the molecular and physiological mechanisms of mass flowering in Shorea curtisii
    Suhaimi AH, Kobayashi MJ, Satake A, Ng CC, Lee SL, Muhammad N, et al.
    PeerJ, 2023;11:e16368.
    PMID: 38047035 DOI: 10.7717/peerj.16368
    Climatic factors have commonly been attributed as the trigger of general flowering, a unique community-level mass flowering phenomenon involving most dipterocarp species that forms the foundation of Southeast Asian tropical rainforests. This intriguing flowering event is often succeeded by mast fruiting, which provides a temporary yet substantial burst of food resources for animals, particularly frugivores. However, the physiological mechanism that triggers general flowering, particularly in dipterocarp species, is not well understood largely due to its irregular and unpredictable occurrences in the tall and dense forests. To shed light on this mechanism, we employed ecological transcriptomic analyses on an RNA-seq dataset of a general flowering species, Shorea curtisii (Dipterocarpaceae), sequenced from leaves and buds collected at multiple vegetative and flowering phenological stages. We assembled 64,219 unigenes from the transcriptome of which 1,730 and 3,559 were differentially expressed in the leaf and the bud, respectively. Differentially expressed unigene clusters were found to be enriched with homologs of Arabidopsis thaliana genes associated with response to biotic and abiotic stresses, nutrient level, and hormonal treatments. When combined with rainfall data, our transcriptome data reveals that the trees were responding to a brief period of drought prior to the elevated expression of key floral promoters and followed by differential expression of unigenes that indicates physiological changes associated with the transition from vegetative to reproductive stages. Our study is timely for a representative general flowering dipterocarp species that occurs in forests that are under the constant threat of deforestation and climate change as it pinpoints important climate sensitive and flowering-related homologs and offers a glimpse into the cascade of gene expression before and after the onset of floral initiation.
    Matched MeSH terms: Reproduction/genetics; Flowers/genetics
  20. Population genetic structure of Anopheles maculatus in Thailand
    Rongnopaurt P, Rodpradit P, Kongsawadworakul P, Sithiprasasna R, Linthicum KJ
    J Am Mosq Control Assoc, 2006 Jun;22(2):192-7.
    PMID: 17014059
    Anopheles (Cellia) maculatus Theobald is a major malaria vector in southern Thailand and peninsular Malaysia, and previous population genetic studies suggested that mountain ranges act as barriers to gene flow. In this study, we examine the genetic variance among 12 collections of natural populations in southern Thailand by analyzing 7 microsatellite loci. Based on analysis of molecular variance (AMOVA), three geographic populations of An. maculatus are suggested. The southern population exists in western Thailand north of 12 degrees north latitude. Mosquitoes to the south fall into two genetic populations: 1) the middle southern collections located on the west side of the Phuket mountain range between 8 degrees and 10 degrees north latitude, and 2) the southern collections located on the east of the Phuket mountain range located between approximately 6.5 degrees and 11.5 degrees north latitude. AMOVA revealed significant genetic differentiation between northern and middle southern and southern populations. The middle southern population was moderately differentiated from the southern population. Furthermore, gene flow was restricted between proximal collections located on different sides of the Phuket mountain range. Collections separated by 50 km exhibited restriction of gene flow when separated by geographic barriers, whereas greater gene flow was evident among collections 650 km apart but without geographic barriers.
    Matched MeSH terms: Anopheles/genetics*; DNA/genetics; Genetics, Population; Microsatellite Repeats/genetics
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