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Choroba Leigha Utwórz PDF Drukuj Wyślij znajomemu

Źródło: http://www.answers.com/topic/leigh-s-disease?cat=health

Tłumaczenie: Dominika Gonsierowska

Opracowanie: Hanna Maciejewska

Definicja

Zespół Leigha powstaje w wyniku zaburzenia mitochondria ( mitochondria – małe organella znajdujące się w większości komórek organizmu). Ujawnia się we wczesnym dzieciństwie i odpowiada na produkcją energii skierowanej do komórek oraz tkanek)

Opis

Zespół Leigha  ( encelopatia martwicza)  należy do bardzo rzadkich chorób o podłożu genetycznym,  polegającym na zaburzonych procesach oddychania komórkowego, co prowadzi do zaburzeń zaopatrzenia tkanek w energię.
Przyczyny występowania choroby  Leigha:
- zaburzenia w DNA jądrowym bądź w mniejszym,
- mniej znanym DNA mitochondrialnym. Geny z obydwu genomów wpływają na poprawne funkcjonowanie mitochondriów.
- mutacje w genach DNA jądrowego i mitochondrialnego są odpowiedzialne za powstawanie zespołu Leigha.
Na poziomie komórkowym osoby z zespołem Leigha nie są w stanie produkować ATP. Tkanki, które nie są zaopatrywane w odpowiednią dawkę energii zazwyczaj obumierają. Pierwsze nieodwracalne zmiany mogą dotyczyć komórek wymagających dużej ilości energii, takich jak mózg,  co jest przyczyną  upośledzenia umysłowego i opóźnienia rozwoju. W zespole Leigha wiele części mózgu dotkniętych jest przez brak ATP, wliczając jądra podstawne, których funkcja związana jest z kontrolą ruchów, pień mózgu odpowiedzialny za funkcję oddychania, połykania, widzenie i słyszenie; oraz móżdżek, który odpowiada za utrzymanie równowagi ciała oraz zależne od woli ruchy mięśni. Mimo to, że w niektórych badaniach wykazano, iż zespół Leigha występuje częściej u mężczyzn niż u kobiet, większość badaczy skłania się do tezy, że dotyka on w taką  samą częstotliwością  u obu płci.

Przyczyny i objawy

Zespół Leigha ujawnia się najczęściej w pierwszym roku życia, lub rzadziej – późniejszych latach dzieciństwa.

Objawy

- hipotonia (obniżone napięcie mięśniowe);
- wymioty;
- ataksja (zaburzenie równowagi bądź koordynacji ruchów);
- mały przyrost;
- opóźnienie rozwoju;
- padaczka;
- kwasica mleczanowa nadmiar kwasu mlekowego, produktu metabolizmu
   węglowodanowego ciała);
- zaburzenia oddychania;
- zaburzenie funkcji nerek;
- zaburzenia widzenia;
- oftalmoplegia (porażenie niektórych lub wszystkich mięśni oka); jest typowym objawem wraz z atrofią optyczną (zwyrodnienie nerwu wzrokowego) oraz retinopatia barwnikowa, która w konsekwencji prowadzi do ślepoty.
 W zespole Leigha, chory nie jest w stanie produkować  ATP (źródło energii w komórce) w mitochondriach.

Diagnoza

Wykrywalność zespołu Leigha jest trudne, ze względu na dużą różnorodność objawów klinicznych oraz odpowiedzialnych za jej występowanie zaburzeń genetycznych. Pomocne w postawieniu właściwej diagnozy są testy genetyczny i mitochondrialne w obrębie jądra DNA. Również  wykonując biopsję mięśniową można ustalić, w obrębie mitochondriów występujące nieprawidłowości. Często wykrywalny jest również niedobór kompleksu białkowego, (oksydaza cytochromowa (COX ), odpowiedzialnego za produkcję energii i  kojarzonego z występowaniem zespołu Leigha, chociaż może oznaczać inne zaburzenia mitochondrialne.

Leczenie

Nie znaleziono dotąd leku, z pomocą którego udało by się spowolnić rozwój zespołu Leigha. Często choroba postępuje w szybki tempie, często podaje się witaminę B1 oraz tiaminę. W celu leczenia kwasicy mleczanowej zaleca się przyjmowanie sody oczyszczonej. Opieka nad osobą z zespołem Leigha głównie polega na łagodzeniu występujących objawów. Osoba ta wymaga opieki neurologicznej, pediatrycznej, genetyka klinicznego, psychologicznej, terapeutycznej i fizjoterapeutycznej, a pod opieką psychologiczną powinna pozostawać cała rodzina osoby z zespołem Leigha .
Prognozy są złe. Wkrótce po wystąpieniu objawów choroby, jej postęp jest wyjątkowo szybki. Śmierć następuje zazwyczaj w skutek zaburzenia oddychania w przeciągu dwóch lat od pojawienia się pierwszych objawów choroby i zazwyczaj dzieje się to przed szóstym rokiem życia.


Źródło: http://www.bbc.co.uk

Tłumaczenie: Dominika Gonsierowska

Co wywołuje chorobę

Zespół Leigh’a jest spowodowany zaburzeniami w mitochondriach – pełniących rolę „elektrowni” w każdej komórce, co prowadzi do szybko postępującej degeneracji ośrodkowego układu nerwowego. Wraz z obumieraniem komórek degeneracja zaczyna obejmować także kolejne części mózgu..
Objawy
Choroba Leigha objawia się zazwyczaj we wczesnym dzieciństwie – między trzecim miesiącem a drugim rokiem życia. Pierwszymi objawami są:
- słaby odruch ssania,
- utrata umiejętności trzymania główki,
- utrata nabytych zdolności motorycznych lub gestów.
- dodatkowo wystąpić może brak apetytu, wymioty, drażliwość, nieustanny płacz.
 W miarę postępu choroby, mogą wystąpić dodatkowe objawy :
- ogólne osłabienie,
- brak napięcia mięśniowego,
- przypadki kwasicy mlekowej, która może prowadzić do upośledzenia funkcji oddechowej i pracy nerek.
- wystąpić mogą także problemy z sercem.

Rokowania są złe.

Śmierć następuje zazwyczaj w przeciągu kilku lat, chociaż niektóre dzieci dożywają okresu nastoletniego.
W rzadkich przypadkach zespół Leigha ujawnia się dopiero w późnym okresie dojrzewania lub wczesnej dorosłości przy czym rozwój choroby jest wolniejszy niż w przypadku jej klasycznej postaci.
 
Kto jest narażony na zachorowanie?

Zespół Leigha związany jest z zaburzeniami w mitochondriach i jest dziedziczony na trzy różne sposoby:
1. Sprzężony z chromosomem X genetyczny niedobór enzymu zwanego kompleksem dehydrogenazy priogrionanowej (PDH-Elx). Chłopcy mogą odziedziczyć chorobę po matce nosicielce. Dziewczynki mogą być nosicielkami. 
2. Autosomalny, dziedziczona recesywnie choroba, która wpływa na gromadzenie się enzymu zwanego oksydazą cytochromową (COX), która jest potrzebna w użyciu tlenu w komórce. W obrębie genu SURF-1 występuje mutacja, która normalnie koduje białko znane jako czynnik składania SURF-1.
Jeśli gen występuje u obojga rodziców, istnieje 25 procentowa szansa, że dziecko będzie dotknięte chorobą.
3. Mutacje w DNA mitochondrialnym także mogą prowadzić do niedoboru dehydrogenazy priogrionanowej, choć zdarza się to dużo rzadziej. Tak jak w DNA tak i w jądrze komórki istnieje niewielka ilość materiału genetycznego zawartego w mitochondriach. Oksydaza cytochromowa składa się z 13-tu podzespołów, niektóre z nich kodowane są przez geny w DNA jądrowym, a niektóre przez mitochondria DNA. DNA mitochondrialne jest  dziedziczone w lini matki, tak więc w tym przypadku, matka może być dotknięta chorobą, a wszystkim dzieciom grozi odziedziczenie genu.
Sposób wykrywania choroby
Diagnoza stawiana jest na podstawie objawów klinicznych, nieprawidłowości w biochemii, oraz tomogramie mózgu przedstawiającym symetryczne zmiany. W niektórych przypadkach występowanie nieprawidłowego genu potwierdzić mogą testy genetyczne. Możliwe jest przeprowadzanie screeningu prenatalnego.
Jak przebiega leczenie
Nie istnieje lek na zespół Leigh’a, a możliwości leczenia są ograniczone i tylko częściowo skuteczne. Zalicza się do nich dietę dostosowaną indywidualnie do pacjenta, przyjmowanie witamin takich jak tiaminy i witaminy B, fizjoterapię, terapię zawodową oraz logopedyczną.
Leki mogą być przydatne w przypadku padaczki, problemów z poruszaniem się oraz powikłań sercowych lub zaburzeniach funkcji nerek.

 


Źródło: http://www.ninds.nih.gov

Tłumaczeni: Dominika Gonsierowska

Zespół Leigha jest rzadką dziedziczą neurometaboliczną chorobą w której zniszczeniu ulega ośrodkowy system nerwowy. Zespół Leigha może być spowodowany mutacjami w DNA mitochondrialnym lub niedoborem enzymu zwanego dehydrogenazą priogronianiową. Objawy zaczynają się zazwyczaj między 3 miesiącem a 2 rokiem życia a postęp choroby jest bardzo szybki. U większości dzieci pierwszymi symptomami jest słaby odruch ssania, problemu z utrzymaniem główki oraz brak zdolności motorycznych. Objawom tym może towarzyszyć utrata apetytu, wymioty, drażliwość, nieprzerwany płacz oraz napady. W trakcie rozwoju choroby występuje także ogólne osłabienie, brak napięcia mięśniowego, okazjonalna kwasica mleczanowa, która może prowadzić do uszkodzenia funkcji oddechowej i funkcji nerek. Pojawić się mogą także problemy z sercem. W rzadkich przypadach choroba Leigha zaczyna się w późnym dzieciństwie lub wczesnej dorosłości a jej rozwój może być wolniejszy. 
Czy można leczyć chorobę Leigha?

Do najpopularniejszych leków w chorobie Leigha zalicza się tiaminę oraz witaminę B1. U pacjentów, którzy cierpią na niedobór dehydrogenazy priogronianiowej, zaleca się ubogą w węglowodany dietę wysokotłuszczową. Doustne podawanie sody oczyszczonej lub sodę oczyszczoną zalecaną  w celu leczenia kwasicy mleczanowej. Obecnie w tym samym celu używa się także eksperymentalnie kwas dwuchlorooctowy (dichloroacetate).
Jakie są prognozy?

Prognozy osób z zespołem Leigha są bardzo pesymistyczne. Osoby, u których stwierdza się niedobór kompleksu białkowego IV oraz te, u których w niedoborze jest dehydrogenaza priogronionowa są w najgorszej sytuacji i umierają zazwyczaj w ciągu kilku lat. Chorzy z częściowymi zaburzeniami mają większe szanse i mogą żyć do 6 lub 7 roku życia. Niektórym osobom udaje się przeżyć kilkanaście lat. 
Jakie prowadzi się obecnie badania?

NINDS wspiera i inicjuje szeroko zakrojone badania kliniczne i podstawowe w zakresie chorób neurogenetycznych takich jak zespół Leigha. Celem tych badań jest próba zrozumienia, co powoduje chorobę oraz wykorzystanie tych informacji w nowych metodach diagnozowania, leczenia a także w zapobieganiu tych chorób.

 

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