<\/span><\/h2>\nDIRA has been diagnosed only in a very small number of children. It occurs at birth or in the first days of life. Cases of families originating from Puerto Rico, Newfoundland (Canada), the Netherlands and Lebanon have been identified.<\/p>\n
DIRA is a autosomal<\/span> recessive genetic disorder, that is, each child of two carrier<\/span> Parents have a 25% chance of DIRA.<\/p>\n<\/span>\nMolecular<\/span> biology and genetics<\/span><\/h3>\nDIRA is due to homozygous<\/span> point mutations<\/span> at gene<\/span> IL1RN (2q14.2) or a large genomic deletion that affects this gene and others in the IL family in chromosome<\/span> 2. the same mutation<\/span> it is detected in all patients originating from a certain area, suggesting a different founder effect in each region. Normal control studies from the same areas found carrier rates for the 0.2% mutation in Newfoundland and 1.3% in Puerto Rica. These mutations, when homozygous, result in the complete absence of functional interleukin-1 receptor antagonist protein. Therefore, interleukin-1 has unopposed effects on the receptor. Interleukin-1 receptor stimulation is a potent activator of inflammatory pathways.<\/p>\n\n
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<\/span>Clinical characteristics of DIRA<\/span><\/h2>\nThe distinctive features of this syndrome are present at birth, or within days of birth, and are due to inflammatory changes in the skin and bones in the absence of fever<\/span>.<\/p>\nIn the first days of life, common presentation features include:<\/p>\n
\n- Fetal suffering<\/li>\n
- \nPustular<\/span> eruption<\/span>\n<\/li>\n
- Oral lesions<\/li>\n
- Joint inflammation<\/li>\n
- Painful movement<\/li>\n
- Enlarged liver and spleen (hepatosplenomegaly<\/span>)<\/li>\n<\/ul>\n
All affected children develop a pustular rash, in which there may be discreet<\/span> crops of pustules<\/span> or a severe generalized<\/span> pustular eruption<\/span> It may resemble generalized pustular psoriasis.<\/p>\nOther skin \/mucous membrane<\/span> reported changes included:<\/p>\n\n- Generalized ichthyosis<\/span>-like changes<\/li>\n
- Nail changes bites<\/span>, separation of the nail from the nail bed, such as nail psoriasis\n<\/li>\n
- \nStomatitis<\/span> - can blister<\/li>\n
- Mouth ulcers<\/span><\/li>\n
- \nConjunctivitis<\/span> (eye pain)<\/li>\n
- \nPyoderma<\/span> gangrenous (one case)<\/li>\n<\/ul>\n
All children develop inflammation<\/span> in the bones, causing painful movements and swelling of the joints. Changes in radiographs are characteristic.<\/p>\nOther features noted in individual cases have included:<\/p>\n
\n- Inflammation of blood vessels<\/span> in the brain (cerebral<\/span> vasculitis<\/span>)<\/li>\n
- \nPulmonary<\/span> hemosiderosis<\/span> (iron statement<\/span> in the lungs) with progressive<\/span> interstitial<\/span> fibrosis<\/span> (scars)<\/li>\n
- \nHypotonia<\/span> (weak muscle tone)<\/li>\n
- Not prosper<\/li>\n<\/ul>\n
High fever is not a typical feature.<\/p>\n
Left untreated, DIRA results in multiple organ failure and death in childhood.<\/p>\n
<\/span>How is DIRA diagnosed?<\/span><\/h2>\nThe presenting features of DIRA suggest a severe acute systemic infection (neonatal<\/span> septicemia<\/span><\/span>) and \/ or bone infection (osteomyelitis<\/span>); However, all infection investigations are negative.<\/p>\nThe following table describes the results of the investigations.<\/p>\n
\n\nUseful tests in the diagnosis of DIRA?<\/caption>\n<\/tbody>\n\n\n| Blood test<\/td>\n | \n\n- increased erythrocytes<\/span> sedimentation rate (ESR<\/span>)<\/li>\n
- increased C-reactive protein<\/span> (CRP<\/span>)<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n
\n| Skin biopsy<\/span><\/td>\n | \n\n- \nepidermal<\/span> neutrophilic<\/span> pustules<\/li>\n
- \npustule<\/span> training throughout hair<\/span> follicles<\/span>\n<\/li>\n
- epidermal acanthosis<\/span> (thickening of the skin)<\/li>\n
- \nhyperkeratosis<\/span> (climbing<\/span>)<\/li>\n
- heavy neutrophils<\/span> infiltrate<\/span> of dermis<\/span>\n<\/li>\n
- clot formationthrombosis<\/span>) in the blood vessels (a child)<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n
\n| X-rays<\/td>\n | \n\n- balloon-shaped swelling of the ends of the ribs (all children)<\/li>\n
- periosteal elevation along multiple long bones<\/li>\n
- heterotopic ossification around the hip<\/li>\n
- multifocal osteolytic lesions (can result in vertebral crush fracture)<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n
\n| Bone biopsy<\/td>\n | \n\n- \npurulent<\/span> osteomyelitis, but not infectious organisms<\/span>\n<\/li>\n
- fibrosis<\/li>\n
- sclerosis<\/span><\/li>\n
- vasculitis in adjacent<\/span> fat and connective tissue<\/span>\n<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n
\n| Cerebral Magnetic resonance<\/span>\n<\/td>\n | \n\n- evidence of vasculitis \/vasculopathy<\/span> (Child)<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n
\n| \nDNA<\/span> analysis<\/td>\n | \n\n- point mutations or large genomic deletion involving the IL1RN gene resulting in the absence of a functional interleukin-1 receptor antagonist<\/li>\n<\/ul>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
<\/span>DIRA Treatment<\/span><\/h2>\nChildren with DIRA can be effectively treated with anakinra, a biological agent that is a recombinant form of the interleukin-1 receptor antagonist, the protein that these children lack. It had recently been made available to treat rheumatoid. arthritis<\/span> when DIRA was first described and characterized in detail.<\/p>\nDiary subcutaneous<\/span> Administration of anakinra replaces the missing protein with an excellent response, particularly in those children with point mutations. In the initial reported case series, complete and rapid resolution of symptoms and signs occurred. The skin changes responded in a few days and the bone radiographs normalized in months. Blood markers of inflammation also returned to normal levels. The response in children with large genomic deletion was less dramatic since blood markers did not normalize. The anakinra dose was started at 1 mg \/ kg \/ day, and increased by 0.5 mg \/ kg \/ day until the response was achieved. Resolution of symptoms and signs has been reported to be long-lasting, with rapid deterioration within 36 hours after discontinuation of anakinra treatment. Therefore, the treatment will be for life. Local reactions at the injection site (redness, itching, swelling) are a common adverse effect, but treatment is well tolerated. Long-term monitoring is not yet available.<\/p>\nNote: Anakinra is not registered or subsidized in New Zealand. In other countries, such as the US and Europe, its registered indication is rheumatoid arthritis.<\/p>\n<\/section>","protected":false},"excerpt":{"rendered":" \u00bfQu\u00e9 es la deficiencia de la interleucina-1 receptor antagonista (DIRA)? La deficiencia del antagonista del receptor de interleucina-1 (DIRA) (MIM 612852) es muy rara gen\u00e9tico autoinflamatorio s\u00edndrome que se presenta…<\/p>","protected":false},"author":8,"featured_media":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","format":"standard","meta":{"footnotes":""},"categories":[204],"tags":[],"class_list":["post-7862","wiki","type-wiki","status-publish","format-standard","category-glosario-definiciones"],"_links":{"self":[{"href":"https:\/\/doctorhoogstra.com\/en\/wp-json\/wp\/v2\/wiki\/7862","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/doctorhoogstra.com\/en\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/doctorhoogstra.com\/en\/wp-json\/wp\/v2\/types\/wiki"}],"author":[{"embeddable":true,"href":"https:\/\/doctorhoogstra.com\/en\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/doctorhoogstra.com\/en\/wp-json\/wp\/v2\/comments?post=7862"}],"version-history":[{"count":0,"href":"https:\/\/doctorhoogstra.com\/en\/wp-json\/wp\/v2\/wiki\/7862\/revisions"}],"wp:attachment":[{"href":"https:\/\/doctorhoogstra.com\/en\/wp-json\/wp\/v2\/media?parent=7862"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/doctorhoogstra.com\/en\/wp-json\/wp\/v2\/categories?post=7862"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/doctorhoogstra.com\/en\/wp-json\/wp\/v2\/tags?post=7862"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}} | | | | | |