Tiktaalik roseae é a única espécie conhecida de Tiktaalik, um género de peixes sarcopterígeos, extintos no período Devoniano tardio e com muitas características típicas de tetrápodes. É um exemplo de várias linhas de sarcopterígeos antigos que desenvolveram adaptações aos habitats pobres em oxigénio das águas pouco profundas presentes no seu tempo, e que levaram à evolução dos primeiros anfíbios. Fósseis bem preservados foram encontrados na Ilha Ellesmere em Nunavut, Canadá.
Introdução
O que você precisa saber de cara
Polidactilia pós-axial tipo B é uma anomalia congênita caracterizada pela presença de um ou mais dedos extras na borda ulnar da mão ou pé. Geralmente, esses dedos são rudimentares e podem estar unidos ao dedo adjacente.
Escala de raridade
<1/50kMuito rara
1/20kRara
1/10kPouco freq.
1/5kIncomum
1/2k
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Entender a doença
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Sinais e sintomas
O que aparece no corpo e com que frequência cada sintoma acontece
Linha do tempo da pesquisa
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Genética e causas
O que está alterado no DNA e como passa nas famílias
Genes associados
2 genes identificados com associação a esta condição. Padrão de herança: Autosomal dominant.
Acts as a transcriptional activator (PubMed:10806483, PubMed:19706761, PubMed:19878745, PubMed:24076122, PubMed:24217340, PubMed:24311597). Binds to the DNA consensus sequence 5'-GACCACCCA-3' (PubMed:2105456, PubMed:24217340, PubMed:8378770). Regulates the transcription of specific genes during normal development (PubMed:19706761). Plays a role in craniofacial development and digital development, as well as development of the central nervous system and gastrointestinal tract. Mediates SHH signal
CytoplasmNucleus
Polydactyly, postaxial, A8
A form of postaxial polydactyly, a condition characterized by the occurrence of supernumerary digits in the upper and/or lower extremities. In postaxial polydactyly type A, the extra digit is well-formed and articulates with the fifth or a sixth metacarpal/metatarsal. PAPA8 is an autosomal recessive condition characterized by the presence of postaxial extra digits (hexadactyly) on the hands and/or the feet.
Has a dual function as a transcriptional activator and a repressor of the sonic hedgehog (Shh) pathway, and plays a role in limb development. The full-length GLI3 form (GLI3FL) after phosphorylation and nuclear translocation, acts as an activator (GLI3A) while GLI3R, its C-terminally truncated form, acts as a repressor. A proper balance between the GLI3 activator and the repressor GLI3R, rather than the repressor gradient itself or the activator/repressor ratio gradient, specifies limb digit num
NucleusCytoplasmCell projection, cilium
Greig cephalo-poly-syndactyly syndrome
Autosomal dominant disorder affecting limb and craniofacial development. It is characterized by pre- and postaxial polydactyly, syndactyly of fingers and toes, macrocephaly and hypertelorism.
Variantes genéticas (ClinVar)
404 variantes patogênicas registradas no ClinVar.
Classificação de variantes (ClinVar)
Distribuição de 682 variantes classificadas pelo ClinVar.
Vias biológicas (Reactome)
6 vias biológicas associadas aos genes desta condição.
Diagnóstico
Os sinais que médicos procuram e os exames que confirmam
Tratamento e manejo
Remédios, cuidados de apoio e o que precisa acompanhar
Onde tratar no SUS
Hospitais de referência no Brasil e o protocolo oficial do SUS (PCDT)
🇧🇷 Atendimento SUS — Polidactilia pós-axial tipo B
Selecione um estado ou use sua localização para ver resultados.
Dados de DATASUS/CNES, SBGM, ABNeuro e Ministério da Saúde. Sempre confirme a disponibilidade diretamente com o estabelecimento.
Pesquisa ativa
Ensaios clínicos abertos e novidades científicas recentes
Pesquisa e ensaios clínicos
Nenhum ensaio clínico registrado para esta condição.
Publicações mais relevantes
Cost Effectiveness of Hand Postaxial Polydactyly Type B Excision in the Office Versus Operating Room.
Postaxial polydactyly type B of the hand can be excised in the office with local anesthesia or in the operating room under general anesthesia. Existing studies have not described the cost difference between these treatments. We compared charges, reimbursements, and outcomes of office and operating room excision. All cases of postaxial polydactyly type B excision at a children's hospital from fiscal year 2018-2023 were included. Independent t tests and Fisher exact tests were performed to compare the charges and outcomes of office and operating room excisions. Random-effects models were used to compare differences in reimbursements since these data were obtained as summary statistics (mean [SD]) by fiscal year. Of 620 total patients, 30 (4.8%) underwent operating room excisions (22 bilateral and 8 unilateral), and 590 (95%) had office excisions (346 bilateral and 244 unilateral). Average total charges were 78% and 84% less for bilateral and unilateral excisions, respectively, in the office than in the operating room. Insurance companies paid $7800 more for bilateral operating room excisions and $7600 more for unilateral operating room excisions. Surgeons received $2300 more for bilateral operating room excisions and $1300 more for unilateral operating room excisions. The treatment strategy did not impact outcomes. Given the cost efficacy and safety of office excision, operating room excision should be limited to patient-specific factors requiring general anesthesia. Prognosis IIb.
Elective Terminations Because of Fetal Abnormalities: Findings in A Tertiary Maternity Center Over 41 Years (1972-2012).
Finding abnormalities in a fetus by prenatal testing during pregnancy is a common reason why parents choose to terminate a pregnancy. A malformations surveillance program of all births at a tertiary center in Boston was used to identify each elective termination because of a malformation detected prenatally. A severity scale of malformations was used: lethal (anencephaly), severe-handicapping (Down syndrome; myelomeningocele), moderate-fixable (omphalocele) and mild (postaxial polydactyly, type B). Demographic characteristics and the findings in prenatal testing were recorded. Six hundred and sixty-nine elective terminations because of fetal abnormalities were identified. A destructive procedure (dilation and evacuation; D&E) was the primary method used to end the pregnancy. The gestational age at the time of termination was 18 to 19 weeks. The two most common sequences of events were: (1) imaging by ultrasound established the diagnosis; (2) imaging by ultrasound led to amniocentesis which established the diagnosis. Ninety-four percent of the abnormalities were either lethal or severe-handicapping. The discovery of a fetal abnormality was a surprise to 98% of the parents. Single women differed from married women in being younger, less well-educated, less likely to have health insurance, and more likely to terminate a pregnancy with moderate-fixable malformations.
Postaxial polydactyly: A case report highlighting genetic context, epidemiological trends, and management options.
This case report examines a newborn with bilateral postaxial polydactyly type B, delivered by a 42-year-old mother with a history of third-degree consanguinity. The mother, having had no prior live births and one abortion, presented at 39 weeks gestation. The absence of prenatal care is noted, with its potential impact on prenatal diagnosis not assessed. The newborn, a healthy girl, weighed 3400 g with an Apgar score of 9/10. Radiographic and physical examination revealed vestigial sixth digits with rudimentary phalanges, influencing the surgical approach. This report underscores the importance of genetic counseling in cases of consanguinity and illustrates the multidisciplinary strategy necessary for managing polydactyly, from surgical considerations to genetic evaluation.
Surgical Excision of Postaxial Polydactyly Type B in the Office Setting.
Simple postaxial polydactyly (type B) is a common congenital hand malformation often treated by suture or clip ligation. We present a case series of patients with simple postaxial polydactyly treated by surgical excision using local anesthesia in an office setting. The procedure was performed on 78 digits in 48 children with a mean age of 10.2 weeks. There were no intraoperative or early postoperative complications. A follow-up by phone interview was performed at an average of 3.2 years postoperatively. All patients were reported to be pain-free and have normal function without a perceived range of motion deficits. All parents selected the highest level of satisfaction regarding cosmetic outcomes and overall experience with the procedure. These results demonstrate that an office-based surgical excision is a safe, effective, and economical treatment option and has developed into our standard of care for this common condition.
Novel Variant in Exon 3 of the BMP4 Gene Resulted in Ectopic Posterior Pituitary, Craniocervical Junction Dysmorphism and Limb Anomaly.
Introduction. Pituitary differentiation involves a large number of transcription factors. In particular, BMP4 expression is fundamental for pituitary gland commitment from the ventral diencephalon, suppressing Shh expression in Rathke's pouch. Pathogenic variants in BMP4 are reported in the literature with a broad phenotypic spectrum, including pituitary and brain malformations. Case Presentation. A five-year-old girl came to medical attention following a mild cervical trauma with onset of cervical pain. On clinical examination at birth, postaxial polydactyly type B of the left hand was observed and removed at 10 months of age. A cervical radiography was performed, and a suspicion of craniocervical junction malformation was made. A magnetic resonance imaging of the cervical spine was made, showing an ectopic posterior pituitary, associated with dysmorphism of the craniocervical junction. The anthropometric parameters were pubertal Tanner stage 1, weight 16 kg (z-score: -1.09), height 107 cm (z-score: -0.76), and BMI 14 kg/m2 (z-score: -0.92). Normal hormonal assessment was detected. Genetic analysis via next generation sequencing showed a novel de novo heterozygous variant (c.277 G > T, p.Glu93 ∗ ) in exon 3 of BMP4. Discussion. We described a novel mutation in BMP4, resulting in ectopic posterior pituitary with normal hormonal assessment, associated to craniocervical junction dysmorphism and limb anomaly. It is important to monitor patient's growth and puberty and to screen the onset of symptoms related to the deficiency of one or more anterior as well as posterior pituitary hormones.
Publicações recentes
Cost Effectiveness of Hand Postaxial Polydactyly Type B Excision in the Office Versus Operating Room.
Elective Terminations Because of Fetal Abnormalities: Findings in A Tertiary Maternity Center Over 41 Years (1972-2012).
Postaxial polydactyly: A case report highlighting genetic context, epidemiological trends, and management options.
Surgical Excision of Postaxial Polydactyly Type B in the Office Setting.
Current Treatment and Billing Trends of Postaxial Polydactyly Type B.
📚 EuropePMC194 artigos no totalmostrando 12
Cost Effectiveness of Hand Postaxial Polydactyly Type B Excision in the Office Versus Operating Room.
Journal of hand surgery global onlineElective Terminations Because of Fetal Abnormalities: Findings in A Tertiary Maternity Center Over 41 Years (1972-2012).
American journal of medical genetics. Part APostaxial polydactyly: A case report highlighting genetic context, epidemiological trends, and management options.
SAGE open medical case reportsSurgical Excision of Postaxial Polydactyly Type B in the Office Setting.
Journal of pediatric orthopedicsCurrent Treatment and Billing Trends of Postaxial Polydactyly Type B.
Plastic and reconstructive surgery. Global openNovel Variant in Exon 3 of the BMP4 Gene Resulted in Ectopic Posterior Pituitary, Craniocervical Junction Dysmorphism and Limb Anomaly.
Case reports in pediatricsCase Report: Biallelic Variant in the tRNA Methyltransferase Domain of the AlkB Homolog 8 Causes Syndromic Intellectual Disability.
Frontiers in geneticsLimited surface examination to evaluate potential teratogens in a resource-limited setting.
Birth defects researchLocal Anesthesia Alone for Postaxial Polydactyly Surgery in Infants.
Hand (New York, N.Y.)A novel missense in GLI3 possibly affecting one of the zinc finger domains may lead to postaxial synpolydactyly: case report.
BMC medical geneticsCauses of Congenital Malformations.
Birth defects researchPolydactyly, postaxial, type B.
Birth defects researchAssociações
Organizações que acompanham esta doença — pra ter apoio e orientação
Ainda não temos associações cadastradas para Polidactilia pós-axial tipo B.
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Comunidades
Grupos ativos de quem convive com esta doença aqui no Raras
Ainda não existe comunidade no Raras para Polidactilia pós-axial tipo B
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Referências e fontes
Bases de dados externas citadas neste artigo
Publicações científicas
Artigos indexados no PubMed ligados a esta doença no grafo RarasNet — título, periódico e PMID direto da fonte, sem intermediação de IA.
- Cost Effectiveness of Hand Postaxial Polydactyly Type B Excision in the Office Versus Operating Room.
- Elective Terminations Because of Fetal Abnormalities: Findings in A Tertiary Maternity Center Over 41 Years (1972-2012).
- Postaxial polydactyly: A case report highlighting genetic context, epidemiological trends, and management options.
- Surgical Excision of Postaxial Polydactyly Type B in the Office Setting.
- Novel Variant in Exon 3 of the BMP4 Gene Resulted in Ectopic Posterior Pituitary, Craniocervical Junction Dysmorphism and Limb Anomaly.
- Current Treatment and Billing Trends of Postaxial Polydactyly Type B.
Bases de dados e fontes oficiais
Identificadores e referências canônicas usadas para montar este verbete.
- ORPHA:93335(Orphanet)
- MONDO:0019674(MONDO)
- GARD:16818(GARD (NIH))
- Variantes catalogadas(ClinVar)
- Busca completa no PubMed(PubMed)
- Q56014346(Wikidata)
Dados compilados pelo RarasNet a partir de fontes abertas (Orphanet, OMIM, MONDO, PubMed/EuropePMC, ClinicalTrials.gov, DATASUS, PCDT/MS). Este conteúdo é informativo e não substitui avaliação médica.
Conteúdo mantido por Agente Raras · Médicos e pesquisadores podem colaborar
