keyword
MENU ▼
Read by QxMD icon Read
search

AMY1

keyword
https://www.readbyqxmd.com/read/28568243/rethinking-the-starch-digestion-hypothesis-for-amy1-copy-number-variation-in-humans
#1
EDITORIAL
Catalina I Fernández, Andrea S Wiley
Alpha-amylase exists across taxonomic kingdoms with a deep evolutionary history of gene duplications that resulted in several α-amylase paralogs. Copy number variation (CNV) in the salivary α-amylase gene (AMY1) exists in many taxa, but among primates, humans appear to have higher average AMY1 copies than nonhuman primates. Additionally, AMY1 CNV in humans has been associated with starch content of diets, and one known function of α-amylase is its involvement in starch digestion. Thus high AMY1 CNV is considered to result from selection favoring more efficient starch digestion in the Homo lineage...
June 1, 2017: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/28539377/dietary-starch-intake-modifies-the-relation-between-copy-number-variation-in-the-salivary-amylase-gene-and-bmi
#2
Gull Rukh, Ulrika Ericson, Johanna Andersson-Assarsson, Marju Orho-Melander, Emily Sonestedt
Background: Studies have shown conflicting associations between the salivary amylase gene (AMY1) copy number and obesity. Salivary amylase initiates starch digestion in the oral cavity; starch is a major source of energy in the diet.Objective: We investigated the association between AMY1 copy number and obesity traits, and the effect of the interaction between AMY1 copy number and starch intake on these obesity traits.Design: We first assessed the association between AMY1 copy number (genotyped by digital droplet polymerase chain reaction) and obesity traits in 4800 individuals without diabetes (mean age: 57 y; 60% female) from the Malmö Diet and Cancer Cohort...
May 24, 2017: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28537471/characteristics-of-labial-gland-mesenchymal-stem-cells-of-healthy-individuals-and-patients-with-sj%C3%A3-gren-syndrome-a-preliminary-study
#3
Shiqin Wang, Hong Hua, Yixiang Wang
Sjögren's Syndrome (SS) is a systemic autoimmune disease characterized by focal lymphocytic infiltration into exocrine organs such as salivary and lacrimal glands, resulting in dry mouth and eyes, and other systemic injuries. The mesenchymal stem cells (MSCs) in the salivary glands of healthy individuals and patients with SS have not been extensively studied. The aim of this study was to eluciadate the characteristics of MSCs from the labial glands of healthy controls and of those from patients with SS in order to elucidate the related pathogenesis and uncover potential avenues for novel clinical interventions...
May 24, 2017: Stem Cells and Development
https://www.readbyqxmd.com/read/28485843/amylin
#4
REVIEW
Debbie L Hay
Amylin is a 37 amino acid peptide hormone that is closely related to calcitonin gene-related peptide (CGRP). Amylin and CGRP share a receptor and are reported to have several similar biological actions. Given the important role of CGRP in migraine and intense efforts to develop drugs against this target, it is important to consider potential areas of overlap between the amylin and CGRP systems. This short review provides a brief introduction to amylin biology, the use of an amylin analog to treat diabetes, and consideration of whether amylin could have any role in headache disorders...
May 2017: Headache
https://www.readbyqxmd.com/read/28317098/cgrp-receptor-activity-in-mice-with-global-expression-of-human-receptor-activity-modifying-protein-1
#5
Keegan J Bohn, Baolin Li, Xiaofang Huang, Bianca N Mason, Anne-Sophie Wattiez, Adisa Kuburas, Christopher S Walker, Peiyi Yang, Jianliang Yu, Beverly A Heinz, Kirk W Johnson, Andrew F Russo
BACKGROUND AND PURPOSE: CGRP is a potent vasodilator and nociceptive neuropeptide linked to migraine. CGRP receptors are heterodimers of receptor activity modifying protein 1 (RAMP1) and either calcitonin receptor-like receptor (CLR; forms canonical CGRP receptor) or calcitonin receptor (CT receptor; forms AMY1 receptor). The goal of this study was to test whether transgenic mice globally expressing human RAMP1 have increased CGRP receptor activity and whether the receptors are sensitive to human selective antagonist telcagepant...
June 2017: British Journal of Pharmacology
https://www.readbyqxmd.com/read/28228143/relationship-between-salivary-pancreatic-amylase-and-body-mass-index-a-systems-biology-approach
#6
Amélie Bonnefond, Loïc Yengo, Aurélie Dechaume, Mickaël Canouil, Maxime Castelain, Estelle Roger, Frédéric Allegaert, Robert Caiazzo, Violeta Raverdy, Marie Pigeyre, Abdelilah Arredouani, Jean-Michel Borys, Claire Lévy-Marchal, Jacques Weill, Ronan Roussel, Beverley Balkau, Michel Marre, François Pattou, Thierry Brousseau, Philippe Froguel
BACKGROUND: Salivary (AMY1) and pancreatic (AMY2) amylases hydrolyze starch. Copy number of AMY1A (encoding AMY1) was reported to be higher in populations with a high-starch diet and reduced in obese people. These results based on quantitative PCR have been challenged recently. We aimed to re-assess the relationship between amylase and adiposity using a systems biology approach. METHODS: We assessed the association between plasma enzymatic activity of AMY1 or AMY2, and several metabolic traits in almost 4000 French individuals from D...
February 23, 2017: BMC Medicine
https://www.readbyqxmd.com/read/28219410/copy-number-variation-of-human-amy1-is-a-minor-contributor-to-variation-in-salivary-amylase-expression-and-activity
#7
Danielle Carpenter, Laura M Mitchell, John A L Armour
BACKGROUND: Salivary amylase in humans is encoded by the copy variable gene AMY1 in the amylase gene cluster on chromosome 1. Although the role of salivary amylase is well established, the consequences of the copy number variation (CNV) at AMY1 on salivary amylase protein production are less well understood. The amylase gene cluster is highly structured with a fundamental difference between odd and even AMY1 copy number haplotypes. In this study, we aimed to explore, in samples from 119 unrelated individuals, not only the effects of AMY1 CNV on salivary amylase protein expression and amylase enzyme activity but also whether there is any evidence for underlying difference between the common haplotypes containing odd numbers of AMY1 and even copy number haplotypes...
February 20, 2017: Human Genomics
https://www.readbyqxmd.com/read/28165287/cgrp-receptor-antagonist-activity-of-olcegepant-depends-on-the-signalling-pathway-measured
#8
Christopher S Walker, Ann C Raddant, Michael J Woolley, Andrew F Russo, Debbie L Hay
Background Calcitonin gene-related peptide (CGRP) is a neuropeptide that acts in the trigeminovascular system and is believed to play an important role in migraine. CGRP activates two receptors that are both present in the trigeminovascular system; the CGRP receptor and the amylin 1 (AMY1) receptor. CGRP receptor antagonists, including olcegepant (BIBN4096BS) and telcagepant (MK-0974), can treat migraine. This study aimed to determine the effectiveness of these antagonists at blocking CGRP receptor signalling in trigeminal ganglia (TG) neurons and transfected CGRP and AMY1 receptors in Cos7 cells, to better understand their mechanism of action...
January 1, 2017: Cephalalgia: An International Journal of Headache
https://www.readbyqxmd.com/read/28125683/differences-in-amy1-gene-copy-numbers-derived-from-blood-buccal-cells-and-saliva-using-quantitative-and-droplet-digital-pcr-methods-flagging-the-pitfall
#9
Delicia Shu Qin Ooi, Verena Ming Hui Tan, Siong Gim Ong, Yiong Huak Chan, Chew Kiat Heng, Yung Seng Lee
INTRODUCTION: The human salivary (AMY1) gene, encoding salivary α-amylase, has variable copy number variants (CNVs) in the human genome. We aimed to determine if real-time quantitative polymerase chain reaction (qPCR) and the more recently available Droplet Digital PCR (ddPCR) can provide a precise quantification of the AMY1 gene copy number in blood, buccal cells and saliva samples derived from the same individual. METHODS: Seven participants were recruited and DNA was extracted from the blood, buccal cells and saliva samples provided by each participant...
2017: PloS One
https://www.readbyqxmd.com/read/28101908/recurrent-rearrangements-of-human-amylase-genes-create-multiple-independent-cnv-series
#10
Nzar A A Shwan, Sandra Louzada, Fengtang Yang, John A L Armour
The human amylase gene cluster includes the human salivary (AMY1) and pancreatic amylase genes (AMY2A and AMY2B), and is a highly variable and dynamic region of the genome. Copy number variation (CNV) of AMY1 has been implicated in human dietary adaptation, and in population association with obesity, but neither of these findings has been independently replicated. Despite these functional implications, the structural genomic basis of CNV has only been defined in detail very recently. In this work, we use high-resolution analysis of copy number, and analysis of segregation in trios, to define new, independent allelic series of amylase CNVs in sub-Saharan Africans, including a series of higher-order expansions of a unit consisting of one copy each of AMY1, AMY2A, and AMY2B...
May 2017: Human Mutation
https://www.readbyqxmd.com/read/27959860/using-genotype-based-recall-to-estimate-the-effects-of-amy1-copy-number-variation-in-substrate-metabolism
#11
Paul W Franks, Frida Renström
No abstract text is available yet for this article.
November 2016: Diabetes
https://www.readbyqxmd.com/read/27853181/selective-sweep-on-human-amylase-genes-postdates-the-split-with-neanderthals
#12
Charlotte E Inchley, Cynthia D A Larbey, Nzar A A Shwan, Luca Pagani, Lauri Saag, Tiago Antão, Guy Jacobs, Georgi Hudjashov, Ene Metspalu, Mario Mitt, Christina A Eichstaedt, Boris Malyarchuk, Miroslava Derenko, Joseph Wee, Syafiq Abdullah, François-Xavier Ricaut, Maru Mormina, Reedik Mägi, Richard Villems, Mait Metspalu, Martin K Jones, John A L Armour, Toomas Kivisild
Humans have more copies of amylase genes than other primates. It is still poorly understood, however, when the copy number expansion occurred and whether its spread was enhanced by selection. Here we assess amylase copy numbers in a global sample of 480 high coverage genomes and find that regions flanking the amylase locus show notable depression of genetic diversity both in African and non-African populations. Analysis of genetic variation in these regions supports the model of an early selective sweep in the human lineage after the split of humans from Neanderthals which led to the fixation of multiple copies of AMY1 in place of a single copy...
November 17, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27436124/metabolomic-profile-of-low-copy-number-carriers-at-the-salivary-%C3%AE-amylase-gene-suggests-a-metabolic-shift-toward-lipid-based-energy-production
#13
Abdelilah Arredouani, Matteo Stocchero, Nicola Culeddu, Julia El-Sayed Moustafa, Jean Tichet, Beverley Balkau, Thierry Brousseau, Marco Manca, Mario Falchi
Low serum salivary amylase levels have been associated with a range of metabolic abnormalities, including obesity and insulin resistance. We recently suggested that a low copy number at the AMY1 gene, associated with lower enzyme levels, also increases susceptibility to obesity. To advance our understanding of the effect of AMY1 copy number variation on metabolism, we compared the metabolomic signatures of high- and low-copy number carriers. We analyzed, using mass spectrometry and nuclear magnetic resonance (NMR), the sera of healthy normal-weight women carrying either low-AMY1 copies (LAs: four or fewer copies; n = 50) or high-AMY1 copies (HAs: eight or more copies; n = 50)...
November 2016: Diabetes
https://www.readbyqxmd.com/read/27233639/identification-and-characterization-of-a-novel-nac-like-gene-in-chrysanthemum-dendranthema-lavandulifolium
#14
Yanfang Yang, Kai Zhu, Jian Wu, Liqing Liu, Guiling Sun, Yanbiao He, Fadi Chen, Deyue Yu
A NAC -like gene named DlNAC1 was identified in chrysanthemum and characterized; it may be involved in regulation of response to abiotic stressors, especially in tolerance to drought and salinity. NAC transcription factors in plants play crucial roles in tolerance to abiotic stressors, and overexpression of the NAC gene in Arabidopsis has been demonstrated to lead to improved drought tolerance. Functions of the NAC genes in chrysanthemum, however, remain poorly understood. In this study, a NAC-like gene named DlNAC1 was identified in chrysanthemum (Dendranthema lavandulifolium) and characterized...
August 2016: Plant Cell Reports
https://www.readbyqxmd.com/read/27149670/low-amy1-gene-copy-number-is-associated-with-increased-body-mass-index-in-prepubertal-boys
#15
M Loredana Marcovecchio, Rosalba Florio, Fabio Verginelli, Laura De Lellis, Cristian Capelli, Delfina Verzilli, Francesco Chiarelli, Angelika Mohn, Alessandro Cama
BACKGROUND: Genome-wide association studies have identified more than 60 single nucleotide polymorphisms associated with Body Mass Index (BMI). Additional genetic variants, such as copy number variations (CNV), have also been investigated in relation to BMI. Recently, the highly polymorphic CNV in the salivary amylase (AMY1) gene, encoding an enzyme implicated in the first step of starch digestion, has been associated with obesity in adults and children. We assessed the potential association between AMY1 copy number and a wide range of BMI in a population of Italian school-children...
2016: PloS One
https://www.readbyqxmd.com/read/27139251/synthesis-and-amylin-receptor-activity-of-glycomimetics-of-pramlintide-using-click-chemistry
#16
Lauren R Yule, Rebekah L Bower, Harveen Kaur, Renata Kowalczyk, Debbie L Hay, Margaret A Brimble
Pramlintide (Symlin®), a synthetic analogue of the neuroendocrine hormone amylin, is devoid of the tendency to form cytotoxic amyloid fibrils and is currently used in patients with type I and type II diabetes mellitus as an adjunctive therapy with insulin or insulin analogues. As part of an on-going search for a pramlintide analogue with improved pharmacokinetic properties, we herein report the synthesis of mono- and di-glycosylated analogues of pramlintide and their activity at the AMY1(a) receptor. Introduction of N-glycosylated amino acids into the pramlintide sequence afforded the native N-linked glycomimetics whilst use of Cu(i)-catalysed azide-alkyne 1,3-dipolar cycloaddition (click) chemistry delivered 1,2,3-triazole linked glycomimetics...
June 21, 2016: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/27081662/reply-to-comment-on-a-second-trigeminal-cgrp-receptor-function-and-expression-of-the-amy1-receptor
#17
Christopher S Walker, Debbie L Hay
No abstract text is available yet for this article.
April 2016: Annals of Clinical and Translational Neurology
https://www.readbyqxmd.com/read/27081661/comment-on-a-second-trigeminal-cgrp-receptor-function-and-expression-of-the-amy1-receptor
#18
Kristian Agmund Haanes, Ka Yi Chan, Antoinette MaassenVanDenBrink
No abstract text is available yet for this article.
April 2016: Annals of Clinical and Translational Neurology
https://www.readbyqxmd.com/read/27068483/complex-copy-number-variation-of-amy1-does-not-associate-with-obesity-in-two-east-asian-cohorts
#19
Rita Y Y Yong, Su'Aidah B Mustaffa, Pavandip S Wasan, Liang Sheng, Christian R Marshall, Stephen W Scherer, Yik-Ying Teo, Eric P H Yap
The human amylase gene locus at chromosome 1p21.1 is structurally complex. This region contains two pancreatic amylase genes, AMY2B, AMY2A, and a salivary gene AMY1. The AMY1 gene harbors extensive copy number variation (CNV), and recent studies have implicated this variation in adaptation to starch-rich diets and in association to obesity for European and Asian populations. In this study, we showed that by combining quantitative PCR and digital PCR, coupled with careful experimental design and calibration, we can improve the resolution of genotyping CNV with high copy numbers (CNs)...
July 2016: Human Mutation
https://www.readbyqxmd.com/read/27022442/low-serum-amylase-and-obesity-diabetes-and-metabolic-syndrome-a-novel-interpretation
#20
REVIEW
Kei Nakajima
For the last decade, low serum amylase (hypoamylasemia) has been reported in certain common cardiometabolic conditions such as obesity, diabetes (regardless of type), and metabolic syndrome, all of which appear to have a common etiology of insufficient insulin action due to insulin resistance and/or diminished insulin secretion. Some clinical studies have shown that salivary amylase may be preferentially decreased in obese individuals, whereas others have revealed that pancreatic amylase may be preferentially decreased in diabetic subjects with insulin dependence...
March 25, 2016: World Journal of Diabetes
keyword
keyword
41430
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"