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Pachyonychia congenita

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68: 40: 323:, or natal teeth. Since PC is inherited in an autosomal dominant fashion in 70% of individuals, it should especially be suspected in patients with symptoms who also have a parent with similar symptoms. Histopathological analysis of skin or nail tissue is not helpful in diagnosis of PC, but can be used to rule out some related diseases. If there is a clinical suspicion for PC, 352:
Hyperkeratosis can be treated with keratolytic emollients while cysts may be treated with incision and drainage. Patients with hyperhidrosis may need to wear moisture-wicking socks and ventilated shoes. Any secondary infection may need to be treated with antibiotics, though infection can often be prevented with appropriate grooming and vinegar or bleach baths.
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Pachyonychia congenita type II (also known as "Jackson–Lawler pachyonychia congenita" and "Jackson–Sertoli syndrome") is an autosomal dominant keratoderma presenting with a limited focal plantar keratoderma that may be very minor, with nails changes that may be evident at birth, but more commonly
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Palmoplantar keratoderma can be treated with consistent grooming, including trimming back the callus, applying emollients, and draining blisters. Plantar pain is often treated by reducing pressure on the feet by minimizing walking, wearing cushioned footwear, or using wheelchairs or crutches.
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Pachyonychia congenita is a rare disorder with an unknown prevalence. As of 2018, the International PC Research Registry has identified approximately 774 individuals with the disease, but prevalence is estimated to be 5,000–10,000 worldwide. The disease affects both males and females.
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McLean W, Rugg E, Lunny D, Morley S, Lane E, Swensson O, Dopping-Hepenstal P, Griffiths W, Eady R, Higgins C, Navsaria H, Leigh I, Strachan T, Kunkeler L, Munro C (1995). "Keratin 16 and keratin 17 mutations cause pachyonychia congenita".
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Pachyonychia Congenita Project is a non-profit dedicated to finding a cure for PC. The organization houses a genetic registry (the International PC Research Registry) and offers free genetic testing for individuals suspected to have PC.
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In order to clinically diagnose pachyonychia congenita, the clinical triad of toenail thickening, plantar keratoderma, and plantar pain must be present. This triad is present in 97% of individuals with PC by the age of 10 years old.
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Smith, Frances JD; Hansen, C. David; Hull, Peter R.; Kaspar, Roger L.; McLean, WH Irwin; O’Toole, Edel; Sprecher, Eli (1993), Adam, Margaret P.; Ardinger, Holly H.; Pagon, Roberta A.; Wallace, Stephanie E. (eds.),
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Eliason, Mark J.; Leachman, Sancy A.; Feng, Bing-jian; Schwartz, Mary E.; Hansen, C. David (October 2012). "A review of the clinical phenotype of 254 patients with genetically confirmed pachyonychia congenita".
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Pachyonychia congenita can be suspected in patients who do not have the complete clinical triad but who exhibit other symptoms such as cysts, oral leukokeratosis, follicular hyperkeratosis, palmoplantar
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There is currently no cure for pachyonychia congenita. Treatment focuses on symptom relief for any plantar pain, hyperkeratoses, cysts, leukokeratosis, hyperhidrosis, or secondary infections.
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skin disorders that are caused by a mutation in one of five different keratin genes. Pachyonychia congenita is often associated with thickened toenails, plantar keratoderma, and plantar pain.
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Smith FJ, Jonkman MF, Van Goor H, Coleman CM, Covello SP, Uitto J, McLean WH (1998). "A Mutation in Human Keratin K6b Produces a Phenocopy of the K17 Disorder Pachyonychia Congenita Type 2".
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biologics. Pachyonychia Congenita Project houses a list of clinical trials and assists with clinical trial recruitment from patients enrolled in their International PC Research Registry.
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that principally involves the plantar surfaces, but also with nails changes that may be evident at birth, but more commonly develop within the first few months of life.
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Pachyonychia congenita consists of five sub-types, each named after its corresponding genetic mutation and each associated with distinguishing clinical features:
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Before the genetic basis of Pachyonychia congenita was identified and described, the disease was historically divided into the following sub-types:
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Bowden PE, Haley JL, Kansky A, Rothnagel JA, Jones DO, Turner RJ (1995). "Mutation of a type II keratin gene (K6a) in pachyonychia congenita".
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Goldberg, I.; Fruchter, D.; Meilick, A.; Schwartz, M.E.; Sprecher, E. (2013-01-30). "Best treatment practices for pachyonychia congenita".
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and is the least common sub-type. It is not often associated with the additional features of oral leukokeratosis, cysts, follicular
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Occasionally, however, a solitary case can emerge in a family with no prior history of the disorder due to the occurrence of a new
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The diagnosis of PC can be confirmed by the identification of a mutation in one of the five genes responsible for the condition:
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Pachyonychia congenita is characterized by a clinical triad present in 97% of people with PC by the time they turn 10 years old:
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Pachyonychia congenita follows an autosomal dominant pattern of inheritance, which means the defective gene is located on an
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Plantar pain that may require some patients to use wheelchairs, canes, crutches, and pain medications due to its severity
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and more commonly associated with the presence of cysts, follicular kyperkeratosis, and natal teeth.
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There are several ongoing investigational therapies for pachyonychia congenita, including topical
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Pachyonychia congenita type I (also known as "Jadassohn–Lewandowsky syndrome") is an
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and more commonly associated with an increased age of onset (>14 years).
667:"Pachyonychia Congenita - NORD (National Organization for Rare Disorders)" 647: 604: 561: 515: 1230: 1002: 204: 197: 884: 1659: 1234: 596: 553: 185: 182: 811: 896: 382: 207:(often referred to as a sporadic, spontaneous or de novo mutation). 1704: 178: 972: 939: 719:
Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007).
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Journal of the European Academy of Dermatology and Venereology
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Pachyonychia congenita has an autosomal dominant pattern of
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and is more commonly associated with severe plantar pain.
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GeneReviews/NCBI/NIH/UW entry on Pachyonychia Congenita
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James, William; Berger, Timothy; Elston, Dirk (2005).
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Andrews' Diseases of the Skin: Clinical Dermatology
55: 32: 1761:Papulosquamous hyperkeratotic cutaneous conditions 690: 688: 686: 671:NORD (National Organization for Rare Disorders) 80:(often abbreviated as "PC") is a rare group of 742: 740: 474:Journal of the American Academy of Dermatology 112:Other signs and symptoms found in PC include: 1214: 1074:Congenital malformations and deformations of 1059: 696:Fitzpatrick's Dermatology in General Medicine 8: 772:"International PC Research Registry (IPCRR)" 305:develop within the first few months of life. 1492:Transient bullous dermolysis of the newborn 1482:Recessive dystrophic epidermolysis bullosa 1251: 1221: 1207: 1199: 1066: 1052: 1044: 875: 714: 712: 66: 38: 29: 147:Excessive sweating of the palms and soles 1177:Giant axonal neuropathy with curly hair 415: 399:Unilateral palmoplantar verrucous nevus 1327:Spondyloepiphyseal dysplasia congenita 279:PC-K17 is caused by a mutation in the 269:PC-K16 is caused by a mutation in the 251:PC-K6c is caused by a mutation in the 241:PC-K6b is caused by a mutation in the 227:PC-K6a is caused by a mutation in the 1608:Ullrich congenital muscular dystrophy 1452:Ullrich congenital muscular dystrophy 793: 791: 766: 764: 447:, University of Washington, Seattle, 7: 1689:Congenital stromal corneal dystrophy 661: 659: 657: 433: 431: 429: 427: 425: 423: 421: 419: 234:and more often associated with oral 1573:Otospondylomegaepiphyseal dysplasia 1552:Schmid metaphyseal chondrodysplasia 337:KRT6A, KRT6B, KRT6C, KRT16, KRT17. 25: 1756:Conditions of the skin appendages 1568:Weissenbacher–ZweymĂĽller syndrome 1477:Epidermolysis bullosa dystrophica 1332:Spondyloepimetaphyseal dysplasia, 723:. St. Louis: Mosby. p. 740. 516:"What Is Pachyonychia Congenita?" 164:Fingernail and toenail infections 1668:Junctional epidermolysis bullosa 1031:Pachyonychia congenita recessive 1673:Laryngoonychocutaneous syndrome 850:"Clinical Trials & Studies" 1: 1530:Multiple epiphyseal dysplasia 1152:Sabinas brittle hair syndrome 220:ILDS: Q84.520 ICD-10: Q84.5 1751:Autosomal dominant disorders 404:List of cutaneous conditions 238:and poor feeding in infants. 327:can confirm the diagnosis. 173:The condition is caused by 1777: 1188:Zimmermann–Laband syndrome 698:. (6th ed.). McGraw-Hill. 694:Freedberg, et al. (2003). 486:10.1016/j.jaad.2011.12.009 1721: 721:Dermatology: 2-Volume Set 135:Follicular hyperkeratosis 46: 37: 1167:Uncombable hair syndrome 750:. (10th ed.). Saunders. 628:Human Molecular Genetics 441:"Pachyonychia Congenita" 150:Excess earwax production 1265:Osteogenesis imperfecta 140:Natal or prenatal teeth 130:steatocystoma multiplex 1580:Type XI collagenopathy 1416:Ehlers–Danlos syndrome 1367:Ehlers–Danlos syndrome 1347:Type II collagenopathy 1276:Ehlers–Danlos syndrome 1102:Pachyonychia congenita 78:Pachyonychia congenita 33:Pachyonychia congenita 1699:Urbach–Wiethe disease 1536:(types 2, 3, & 6) 1378:Sack–Barabas syndrome 1282:(types 1, 2, & 7) 940:167210 167200, 167210 116:Thickened fingernails 854:www.pachyonychia.org 776:www.pachyonychia.org 640:10.1093/hmg/7.7.1143 520:www.pachyonychia.org 1630:Bullous pemphigoid 1301:Hypochondrogenesis 1172:Björnstad syndrome 983:External resources 597:10.1038/ng0795-363 554:10.1038/ng0395-273 310:Clinical Diagnosis 296:autosomal dominant 119:Palmar keratoderma 99:Thickened toenails 91:Signs and symptoms 1733: 1732: 1654: 1653: 1646:Knobloch syndrome 1422:(types 1 & 2) 1373:(types 3 & 4) 1322:Marshall syndrome 1317:Stickler syndrome 1196: 1195: 1017: 1016: 812:10.1111/jdv.12098 730:978-1-4160-2999-1 331:Genetic Diagnosis 175:genetic mutations 128:Cysts, including 75: 74: 27:Medical condition 16:(Redirected from 1768: 1726:fibrous proteins 1711:DFNA8/12, DFNB21 1615: 1612: 1604: 1601: 1597:Bethlem myopathy 1577: 1537: 1534: 1515: 1512: 1508:Fuchs' dystrophy 1459: 1456: 1448: 1445: 1441:Bethlem myopathy 1423: 1420: 1374: 1371: 1343:Kniest dysplasia 1338: 1337:(Strudwick type) 1335: 1312: 1309: 1283: 1280: 1272: 1269: 1252: 1247:Collagen disease 1223: 1216: 1209: 1200: 1131:/abnormalities: 1068: 1061: 1054: 1045: 876: 864: 863: 861: 860: 846: 840: 839: 795: 786: 785: 783: 782: 768: 759: 744: 735: 734: 716: 707: 692: 681: 680: 678: 677: 663: 652: 651: 623: 617: 616: 580: 574: 573: 536: 530: 529: 527: 526: 512: 506: 505: 468: 462: 461: 460: 459: 435: 160:Angular chelitis 71: 70: 62:Medical genetics 42: 30: 21: 1776: 1775: 1771: 1770: 1769: 1767: 1766: 1765: 1736: 1735: 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Retrieved 519: 510: 477: 473: 466: 456:, retrieved 445:GeneReviews® 444: 368: 359: 356:Epidemiology 350: 347: 336: 334: 317: 313: 289: 281: 271: 253: 243: 229: 222: 219: 202: 195: 181:that encode 172: 111: 94: 77: 76: 18:Pachyonychia 1140:Monilethrix 1111:Koilonychia 1097:Leukonychia 908:Q84.520), ( 299:keratoderma 264:natal teeth 192:Inheritance 104:keratoderma 49:inheritance 1740:Categories 1237:and other 1162:Pili torti 1106:Onychauxis 957:DiseasesDB 859:2018-08-01 781:2018-08-01 676:2018-08-02 525:2018-08-01 458:2018-08-01 410:References 156:Hoarseness 1724:see also 1092:Anonychia 992:eMedicine 968:SNOMED CT 820:0926-9959 494:1097-6787 371:sirolimus 344:Treatment 211:Diagnosis 82:autosomal 57:Specialty 1614:(type 2) 1603:(type 2) 1514:(type 1) 1458:(type 1) 1447:(type 1) 1311:(type 2) 1231:collagen 1003:Orphanet 997:derm/812 973:39427000 912:Q84.530) 836:29684041 828:23363249 613:26060130 502:22264670 453:20301457 393:See also 387:anti-TNF 365:Research 205:mutation 198:autosome 186:proteins 153:Ear pain 144:Blisters 102:Plantar 85:dominant 1660:Laminin 1235:laminin 951:D009264 648:9618173 605:7545493 570:1873772 562:7539673 383:statins 183:keratin 1639:COL18: 1623:COL17: 1611:  1600:  1590:COL12: 1576:  1561:COL11: 1545:COL10: 1533:  1511:  1455:  1444:  1419:  1370:  1334:  1308:  1279:  1268:  1028:260130 1026:OMIM: 834:  826:  818:  754:  727:  702:  646:  611:  603:  568:  560:  500:  492:  451:  385:, and 262:, and 64:  1705:TECTA 1682:Other 1523:COL9: 1501:COL8: 962:32826 929:757.5 926:703.8 902:Q84.5 832:S2CID 609:S2CID 566:S2CID 375:siRNA 282:KRT17 272:KRT16 254:KRT6C 244:KRT6B 230:KRT6A 179:genes 169:Cause 122:Oral 1468:COL7 1432:COL6 1407:COL5 1388:COL4 1358:COL3 1292:COL2 1256:COL1 1008:2309 946:MeSH 935:OMIM 921:9-CM 910:ILDS 906:ILDS 824:PMID 816:ISSN 752:ISBN 725:ISBN 700:ISBN 644:PMID 601:PMID 558:PMID 498:PMID 490:ISSN 449:PMID 284:gene 274:gene 256:gene 246:gene 232:gene 1035:NIH 1033:at 917:ICD 893:ICD 808:doi 636:doi 593:doi 550:doi 482:doi 1742:: 1233:, 1186:: 1006:: 995:: 971:: 960:: 949:: 938:: 924:: 900:: 897:10 852:. 830:. 822:. 814:. 804:28 802:. 790:^ 774:. 763:^ 739:^ 711:^ 685:^ 669:. 656:^ 642:. 630:. 607:. 599:. 589:10 587:. 564:. 556:. 544:. 518:. 496:. 488:. 478:67 476:. 443:, 418:^ 381:, 377:, 373:, 1582:) 1578:( 1470:: 1434:: 1409:: 1390:: 1360:: 1349:) 1345:( 1294:: 1258:: 1222:e 1215:t 1208:v 1104:/ 1067:e 1060:t 1053:v 919:- 904:( 895:- 885:D 862:. 838:. 810:: 784:. 758:. 733:. 706:. 679:. 650:. 638:: 632:7 615:. 595:: 572:. 552:: 546:9 528:. 504:. 484:: 266:. 51:. 20:)

Index

Pachyonychia

inheritance
Specialty
Medical genetics
Edit this on Wikidata
autosomal
dominant
keratoderma
leukokeratosis
steatocystoma multiplex
Follicular hyperkeratosis
Natal or prenatal teeth
Angular chelitis
genetic mutations
genes
keratin
proteins
autosome
mutation
KRT6A gene
leukokeratosis
KRT6B gene
KRT6C gene
hyperkeratosis
natal teeth
KRT16 gene
KRT17 gene
autosomal dominant
keratoderma

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