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Lytico-bodig disease

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was up to 3 mg/250 ml. Cox also observed decline in fruit bat consumption matching the decline in lytico-bodig. Support for the BMAA theory of the Guam disease came from the finding reported in 2016 that chronic dietary exposure of vervet monkeys homozygous for the APOE4 gene (which in humans increases risk of Alzheimer's disease) to the cyanobacterial toxin BMAA produces dense neurofibrillary tangles and sparse amyloid plaques similar to that found in the brains of Chamorro villagers in Guam who died from lytico-bodig.
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and some non-Chamorro who moved to the island and followed the culture did develop it. Targeted high-throughput sequencing in a relatively small sample demonstrates that disease in many patients can be explained by pathogenic mutations in known genes for neurodegeneration. This includes parkinsonism-dementia due to PINK1 homozygous mutations, a DCTN1 mutation that may be causal for Perry syndrome, Huntington's disease due to HTT expansions, and FUS and ALS2 mutations.
534: 425: 182: 383:(beta-Methylamino-L-alanine). Initial laboratory results found low levels of free BMAA in cycad flour. The cycad hypothesis was abandoned a second time, because the acute toxicity shown by Spencer and Nunn was due to BMAA concentrations orders of magnitude higher. Further laboratory analysis, which included protein-bound BMAA, found significant levels in 368:, was a potent toxin; it was discovered in the 1950s. As toxic as it was, it was incapable of causing of the symptoms of lytico-bodig. Not only that, after nearly two decades of NIH-funded research, animal models failed to reproduce chronic Lytico-Bodig, and the hypothesis was rejected for the first time. 297:
The doctor visited a patient who had just suddenly come down with a virulent form. His symptoms had begun 18 months before, starting with a strange immobility and a loss of initiative and spontaneity; he found he had to make a huge effort to walk, to stand, and to make the least movement—his body was
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Genetics was first hypothesized due to the situation on Guam. Lytico-bodig was found in great numbers among members of the Chamorro community, so genetic factors were possible. The disease was shown to be familial but not genetic. Chamorro who grew up outside of Guam had not developed the disease,
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was given to patients to alleviate some of the symptoms of bodig, but this only gave the patients one or two hours of freedom from the complete paralysis and rigidity of limbs. It seems in the case of the Chamorros, family members are the primary caregivers, and they have accepted those who are ill
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BMAA in their fat, and eating even a few bats would cause a dose of BMAA similar to levels that produced disease symptoms in the earlier animal models. The content of free BMAA in fruit bats was up to 3 mg/g (approximately 30 mM), while that in the broth in which the fruit bats had been cooked
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While neurofibrillary degeneration is a potential cause of lytico-bodig, much is still undiscovered as to what causes the symptoms, what governs the severity, and how the onset of symptoms progresses. Similar symptoms of Postencephalitic Parkinsonism patients and Alzheimer's patients could account
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are viewed under microscope. "Many of the cells are pale and depigmented. There's a lot of glial reaction, and bits of loose pigment. Shifting to a higher power, he saw a huge number of neurofibrillary tangles, densely staining, convoluted masses, harshly evident within the destroyed nerve cells."
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Age of onset seems to be increasing with no more teenage cases and almost no patients in their twenties. Presentation also varies between years. One form of the disease will present itself chiefly in one decade and then another form predominates in the next.
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The advanced progression presents as profound motionlessness, or catatonia, accompanied with tremors or rigidity. Except in cases with concurrent dementia, most patients are capable of lucid thought and speech throughout the disease's physical progression.
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Patients in the most virulent stage present with mouths hanging open, with excessive salivation; their tongues hang motionless, rendering speech and swallowing impossible. The patient's arms and legs become severely spastic and bent in immovable tension.
168:, in their body fat. The hypothesis suggests that consumption of the bats by the Chamorro exposed them to BMAA, contributing to or causing their condition. Decline in consumption of the bats has been linked to a decline in the incidence of the disease. 505:
Looking at other samples of hypothalamus, spinal cord, and cortex, all were full of neurofibrillary tangles. Neurofibrillary degeneration was everywhere. These slides were similar in appearance to those taken from postencephalitic parkinsonism.
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Diaphragm and respiratory accessory muscles can become paralyzed necessitating mechanical ventilation to facilitate breathing. Saliva must be suctioned from the mouth to prevent aspiration. This form of lytico-bodig is fatal in all cases.
129:. The frequency of cases grew amongst the Chamorro until it was the leading cause of adult death between 1945 and 1956. The incidence rate was 200 per 100,000 per year and it was 100 times more prevalent than in the rest of the world. 364:, and the flour is then used to make flatbread and dumplings. The flour is soaked and washed several times, as the seed in its natural form is extremely toxic. Ample research on the cycad hypothesis found a component of the seeds, 379:, Marjorie Whiting, a nutritional anthropologist, asked Arthur Bell, a plant biochemist, to test cycad seeds for their chemical constituents. Bell and his colleagues discovered another toxic substance in the seeds, 1034:
Steele JC, Guella I, Szu-Tu C, Lin MK, Thompson C, Evans DM, Sherman HE, Vilariño-Güell C, Gwinn K, Morris H, Dickson DW, Farrer MJ (2015). "Defining neurodegeneration on Guam by targeted genomic sequencing".
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Patient presentations include muscle atrophy, maxillofacial paralysis, inability to speak or swallow and subsequent choking. Some patients retain mental lucidity throughout the illness until death, much like
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Morris HR, Al-Sarraj S, Schwab C, Gwinn-Hardy K, Perez-Tur J, Wood NW, Hardy J, Lees AJ, McGeer PL, Daniel SE, Steele JC (November 2001). "A clinical and pathological study of motor neurone disease on Guam".
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Kisby GE, Ellison M, Spencer PS (July 1992). "Content of the neurotoxins cycasin (methylazoxymethanol beta-D-glucoside) and BMAA (beta-N-methylamino-L-alanine) in cycad flour prepared by Guam Chamorros".
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Duncan MW, Steele JC, Kopin IJ, Markey SP (May 1990). "2-Amino-3-(methylamino)-propanoic acid (BMAA) in cycad flour: an unlikely cause of amyotrophic lateral sclerosis and parkinsonism-dementia of Guam".
402:, after re-examining aspects of the Chamorro diet. Cox and his colleagues found that BMAA is produced by symbiotic cyanobacteria found in the coralloid roots of cycads. Other than that, fruit bats or 955:
Monson CS, Banack SA, Cox PA (2003). "Conservation implications of Chamorro consumption of flying foxes as a possible cause of amyotrophic lateral sclerosis-parkinsonism dementia complex in Guam".
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and restless, and demonstrate irrational behavior, such as violence, and deep emotions at odd intervals. Patients experience manic highs and lows, giggling one minute and screaming the next.
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for the similarities in symptoms of lytico and bodig. Lytico-bodig, postencephalitis, and Alzheimer's could possibly be the same disease taking three different forms.
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disobedient. The immobility attacked with frightening speed, and within a year, he was unable to stand alone and could not control his posture (2006).
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No standard form of bodig has been reported and the documented cases of the disease manifested in many different clinical presentations.
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Bradley WG, Mash DC (2009). "Beyond Guam: the cyanobacteria/BMAA hypothesis of the cause of ALS and other neurodegenerative diseases".
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Banack SA, Murch SJ, Cox PA (June 2006). "Neurotoxic flying foxes as dietary items for the Chamorro people, Marianas Islands".
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Brody JA, Chen K (1969). "Changing epidemiologic patterns of Amyotrophic Lateral Sclerosis and Parkinsonism-Dementia on Guam".
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Vega A, Bell EA (1967). "Alpha-amino-beta-methylaminopropionic acid, a new amino acid from seeds of cycas circinalis".
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As with bodig, the symptoms and forms of lytico present themselves differently from patient to patient.
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Miller G (July 2006). "Neurodegenerative disease. Guam's deadly stalker: on the loose worldwide?".
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Cheng R, Banack SA (2009). "Previous studies underestimate BMAA concentrations in cycad flour".
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seeds is consumed in the traditional Chamorro diet. The seeds are ground to make a flour called
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Progressive dementia is also characteristic of bodig. Those who experience dementia are often
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Banack SA, Cox PA (2003). "Biomagnification of cycad neurotoxins in flying foxes".
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Golbe LI (September 2000). "Progressive supranuclear palsy in the molecular age".
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No treatment has been found to cure lytico-bodig. In some cases, the drug
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Guam disease, amyotrophic lateral sclerosis-parkinsonism-dementia, ALS-PDC
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feed on cycad seeds, and were a common food for the Chamorros. The bats
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Steele JC (August 2005). "Parkinsonism-dementia complex of Guam".
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The mechanism is complex and poorly understood. During autopsies,
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Cox PA, Davis DA, Mash DC, Metcalf JS, Banack SA (January 2016).
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and provide home care for all those inflicted with lytico-bodig.
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Some hypotheses as to the cause of the disease include genetics,
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are found in the brain which are congruent to the brain of an
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words for two different manifestations of the same condition.
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made at settlements with a higher incidence of lytico-bodig.
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Motor Neuron Diseases Research on ALS and Related Disorders
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and colleagues in 1961, reflects its resemblance to
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amyotrophic lateral sclerosis-parkinsonism-dementia
37: 32: 242:Lytico-bodig disease presents itself in two ways: 246:Lytico is a cortical degeneration that resembles 256:Bodig is a subcortical degeneration resembling 121:First reports of the disease surfaced in three 855: 853: 798:Cox PA, Banack SA, Murch SJ (November 2003). 8: 453:. Unsourced material may be challenged and 337:(BMAA) from the consumption of fruit bats. 210:. Unsourced material may be challenged and 125:on Guam in 1904 which made some mention of 1369: 29: 1343: 950: 948: 885: 833: 823: 473:Learn how and when to remove this message 230:Learn how and when to remove this message 723: 721: 719: 717: 640: 638: 394:The cycad hypothesis was resurrected by 765: 763: 591: 371:In 1967, following studies that linked 793: 791: 7: 451:adding citations to reliable sources 208:adding citations to reliable sources 150:had been feeding on Federico nuts ( 1289:10.1212/01.wnl.0000078320.18564.9f 136:detailed this disease in his book 25: 496:The following is an excerpt from 977:10.1046/j.1523-1739.2003.02049.x 532: 423: 180: 262:progressive supranuclear palsy 1: 1100:10.1016/s0031-9422(00)86018-5 613:10.1016/S0140-6736(00)02672-6 248:amyotrophic lateral sclerosis 108:amyotrophic lateral sclerosis 923:10.1126/science.313.5786.428 804:Proc. Natl. Acad. Sci. U.S.A 772:The Island of the Colorblind 684:Moisse, Katie (2013-09-24). 387:; the levels were higher in 303:The Island of the Colorblind 139:The Island of the Colorblind 354:The starch from indigenous 252:frontotemporal degeneration 1459: 774:. New York: Random House. 335:beta-Methylamino-L-alanine 1254:10.1016/j.jep.2005.12.032 1211:10.3109/17482960903273528 1013:10.1093/brain/124.11.2215 860:Holtcamp W (March 2012). 738:10.3109/17482960903286009 649:. 20 Suppl 12: S99–S107. 72:neurodegenerative disease 866:Environ. Health Perspect 688:. Scientificamerican.com 498:Island of the Colorblind 146:subsequently wrote that 1203:Amyotroph Lateral Scler 825:10.1073/pnas.2235808100 730:Amyotroph Lateral Scler 487:neurofibrillary tangles 1443:Neurological disorders 1336:10.1098/rspb.2015.2397 770:Sacks, Oliver (2006). 541:This section is empty. 500:, in which samples of 307: 305:, Vintage Books, 1996 1438:Corticobasal syndrome 1172:10.1212/wnl.42.7.1336 295: 1205:. 10 Suppl 2: 41–3. 1128:10.1212/wnl.40.5.767 957:Conservation Biology 878:10.1289/ehp.120-a110 732:. 10 Suppl 2: 7–20. 447:improve this section 333:seeds, and ingested 204:improve this section 156:) and concentrating 33:Lytico-bodig disease 18:Lytico-Bodig disease 1092:1967PChem...6..759V 1037:Annals of Neurology 969:2003ConBi..17..678M 816:2003PNAS..10013380C 116:Alzheimer's disease 112:Parkinson's disease 102:, a term coined by 1402:External resources 1007:(Pt 11): 2215–22. 341:Genetic hypothesis 172:Symptoms and signs 123:death certificates 1425: 1424: 1049:10.1002/ana.24346 655:10.1002/mds.20547 573: 561: 560: 483: 482: 475: 357:Cycas micronesica 240: 239: 232: 161: 153:Cycas micronesica 96:Chamorro language 82:of the island of 45: 44: 27:Medical condition 16:(Redirected from 1450: 1370: 1358: 1357: 1347: 1315: 1309: 1308: 1272: 1266: 1265: 1242:J Ethnopharmacol 1237: 1231: 1230: 1198: 1192: 1191: 1154: 1148: 1147: 1110: 1104: 1103: 1075: 1069: 1068: 1031: 1025: 1024: 995: 989: 988: 952: 943: 942: 917:(5786): 428–31. 906: 900: 899: 889: 857: 848: 847: 837: 827: 795: 786: 785: 767: 758: 757: 725: 712: 711: 703: 697: 696: 694: 693: 681: 675: 674: 642: 633: 632: 596: 571: 556: 553: 543:You can help by 536: 529: 502:substantia nigra 478: 471: 467: 464: 458: 427: 419: 350:Cycad hypothesis 235: 228: 224: 221: 215: 184: 176: 164:(BMAA), a known 159: 30: 21: 1458: 1457: 1453: 1452: 1451: 1449: 1448: 1447: 1428: 1427: 1426: 1421: 1420: 1397: 1396: 1381: 1367: 1362: 1361: 1324:Proc. 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Disord 552:August 2021 491:Alzheimer's 131:Neurologist 104:Asao Hirano 38:Other names 1432:Categories 692:2013-09-28 586:References 281:patients. 250:(ALS) and 166:neurotoxin 1277:Neurology 1160:Neurology 1116:Neurology 525:Diagnosis 493:patient. 434:does not 415:Mechanism 373:lathyrism 191:does not 127:paralysis 1411:Orphanet 1354:26791617 1330:(1823). 1305:38943437 1297:12913204 1262:16457975 1227:40589338 1219:19929730 1188:71620280 1144:25006038 1065:20492783 1057:25558820 1021:11673323 985:84948326 939:34147464 931:16873621 896:22382274 844:14612559 754:41622254 746:19929726 710:: 61–79. 671:28721189 663:16092098 629:44344682 621:11036887 574:-alanine 564:See also 162:-alanine 76:etiology 1345:4795023 1180:1620343 1136:2330104 1088:Bibcode 965:Bibcode 911:Science 887:3295368 812:Bibcode 455:removed 440:sources 366:cycasin 311:aphasic 212:removed 197:sources 110:(ALS), 100:ALS-PDC 70:) is a 68:ALS-PDC 56:disease 1392:105500 1352:  1342:  1303:  1295:  1260:  1225:  1217:  1186:  1178:  1142:  1134:  1063:  1055:  1019:  983:  937:  929:  894:  884:  842:  835:263822 832:  778:  752:  744:  669:  661:  627:  619:  601:Lancet 576:(BMAA) 518:L-DOPA 389:fadang 385:fadang 362:fadang 269:Lytico 114:, and 88:Lytigo 50:(also 1416:90020 1301:S2CID 1223:S2CID 1184:S2CID 1140:S2CID 1061:S2CID 1001:Brain 981:S2CID 935:S2CID 750:S2CID 667:S2CID 625:S2CID 331:cycad 325:Cause 289:Bodig 92:bodig 62:, or 1387:OMIM 1350:PMID 1293:PMID 1258:PMID 1215:PMID 1176:PMID 1132:PMID 1053:PMID 1017:PMID 927:PMID 892:PMID 840:PMID 776:ISBN 742:PMID 659:PMID 617:PMID 438:any 436:cite 398:and 381:BMAA 377:ODAP 260:and 195:any 193:cite 148:bats 94:are 90:and 84:Guam 1340:PMC 1332:doi 1328:283 1285:doi 1250:doi 1246:106 1207:doi 1168:doi 1124:doi 1096:doi 1045:doi 1009:doi 1005:124 973:doi 919:doi 915:313 882:PMC 874:doi 870:120 830:PMC 820:doi 808:100 734:doi 651:doi 609:doi 605:356 547:. 449:by 375:to 279:ALS 206:by 1434:: 1414:: 1390:: 1348:. 1338:. 1326:. 1322:. 1299:. 1291:. 1281:61 1279:. 1256:. 1244:. 1221:. 1213:. 1182:. 1174:. 1164:42 1162:. 1138:. 1130:. 1120:40 1118:. 1094:. 1084:16 1082:. 1059:. 1051:. 1041:77 1039:. 1015:. 1003:. 979:. 971:. 961:17 959:. 947:^ 933:. 925:. 913:. 890:. 880:. 868:. 864:. 852:^ 838:. 828:. 818:. 806:. 802:. 790:^ 762:^ 748:. 740:. 716:^ 665:. 657:. 637:^ 623:. 615:. 603:. 118:. 58:, 54:) 1379:D 1356:. 1334:: 1307:. 1287:: 1264:. 1252:: 1229:. 1209:: 1190:. 1170:: 1146:. 1126:: 1102:. 1098:: 1090:: 1067:. 1047:: 1023:. 1011:: 987:. 975:: 967:: 941:. 921:: 898:. 876:: 846:. 822:: 814:: 784:. 756:. 736:: 695:. 673:. 653:: 631:. 611:: 572:L 554:) 550:( 476:) 470:( 465:) 461:( 457:. 443:. 264:. 233:) 227:( 222:) 218:( 214:. 200:. 160:L 66:( 20:)

Index

Lytico-Bodig disease
neurodegenerative disease
etiology
Chamorro people
Guam
Chamorro language
Asao Hirano
amyotrophic lateral sclerosis
Parkinson's disease
Alzheimer's disease
death certificates
paralysis
Neurologist
Oliver Sacks
The Island of the Colorblind
Paul Alan Cox
bats
Cycas micronesica
β-methylamino-L-alanine
neurotoxin

cite
sources
improve this section
adding citations to reliable sources
removed
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amyotrophic lateral sclerosis
frontotemporal degeneration
parkinsonism

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