sollte vermutet werden genetischer Mosaikismus wenn der Patient Folgendes vorstellt:
- Asymmetrische Wachstumsstörung.
- Kombiniert mit Pigmentläsionen der Haut mit fleckiger Verteilung (z. B. Café-au-lait-Flecken, Nävus usw.), insbesondere wenn sie eine Verteilung gemäß den Blaschko-Linien aufweisen.
- Kombiniert mit Gefäßfehlbildungen.

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1.
Biesecker LG, Spinner NB. Eine genomische Betrachtung von Mosaizismus und menschlichen Erkrankungen. Nat Rev Genet [Internet]. Mai 2013 [zitiert am 2. Oktober 2015];14(5):307–20. Verfügbar unter: http://www.nature.com/nrg/journal/v14/n5/abs/nrg3424.html
Kutaner Mosaikismus und mosaikartige neurokutane Erkrankungen.
- Das Vorhandensein von pigmentiertem Hautmosaik ist ein Risikofaktor für neurologische Entwicklungsstörungen (bei bis zu 56 % treten extrakutane Manifestationen auf, die neurologischer, skelettaler, endokrinologischer usw. Natur sein können).
- Mosaikkrankheiten können verschiedene genetische Ursachen haben, von Punktmutationen bis hin zu Chromosomenumlagerungen.
- Die Differenzialdiagnose der verschiedenen Arten von Mosaikerkrankungen ist schwierig. Sie zeichnen sich dadurch aus, dass sie ein sehr breites phänotypisches Spektrum mit einem hohen Grad an klinischer Variabilität aufweisen, da das Wesen des Mosacismus die Kombination mehrerer Zellpopulationen mit unterschiedlichen genetischen Codes ist und deren Verteilung und Anteil zufällig sind.
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1.
Kromann AB, Ousager LB, Ali IKM, Aydemir N, Bygum A. Pigmentmosaik: Eine Übersicht über die Originalliteratur und Empfehlungen für den künftigen Umgang. Orphanet Journal of Rare Diseases [Internet]. 5. März 2018 [zitiert am 20. Juli 2019];13(1):39. Verfügbar unter: https://doi.org/10.1186/s13023-018-0778-6
Mosaik-chromosomale Umlagerungen (CNV).
- Es gibt einige Syndrome mit ausschließlich mosaikartigem Erscheinungsbild, wie z Pallister-Killian-Syndrom.
- Der Ito-Hypomelanose Es handelt sich um eine klassische neurokutane Erkrankung, bei der eine durch Biopsie erkennbare Chromosomenumlagerung vorliegt (die mehrere verschiedene Chromosomenregionen betreffen kann) und Pigmentveränderungen verursacht, indem sie die Entwicklung der Neuralleiste beeinträchtigt (Neurokristopathie).
Monogenetische Mosaikkrankheiten.
- Dabei handelt es sich um Erkrankungen mit autosomal-dominantem Erbgang.
- Einige von ihnen sind in ihrer konstitutionellen Darstellung nicht mit dem Leben vereinbar (sie führen zu Abtreibungen oder zum Tod des Fötus, wie zum Beispiel dem CHILD-Syndrom), da das betroffene Gen von hoher evolutionärer Bedeutung ist und daher nur Mosaike mit einem abgeschwächten Phänotyp überleben.
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1.
Ruggieri M, Praticò PD, Happle R. Mosaikartige neurokutane Erkrankungen und ihre Ursachen. Seminars in Pediatric Neurology [Internet]. 13. November 2015 [zitiert am 13. November 2015]; verfügbar unter: http://www.sciencedirect.com/science/article/pii/S1071909115000765
Gehirnmosaik und Gehirnfehlbildungen:
- Es gibt einige Fehlbildungen des Gehirns, die auf eine Mosaikmutation zurückzuführen sind.
- Die anatomische Verteilung der Fehlbildung kann dabei helfen, darauf zu schließen, dass es sich um eine Mosaikerkrankung handelt. Daher ist eine bildgebende Untersuchung hilfreich, um die genetische Untersuchung zu planen.



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1.
Rodin RE, Walsh CA. Somatische Mutationen bei neurologischen Erkrankungen im Kindesalter. Pediatric Neurology [Internet]. 2018 [zitiert am 4. Dezember 2018];87:20–2. Verfügbar unter: https://linkinghub.elsevier.com/retrieve/pii/S0887899418308580
Diagnosetechniken für zerebralen Mosaikismus.
Genetische Mosaike sind im peripheren Blut häufig nicht nachweisbar und es ist notwendig, eine Untersuchung im betroffenen Gewebe durchzuführen.

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1.
Ye Z, McQuillan L, Poduri A, Green TE, Matsumoto N, Mefford HC, et al. Somatische Mutation: Die verborgene Genetik von Hirnfehlbildungen und fokalen Epilepsien. Epilepsieforschung [Internet]. 2019 [zitiert am 20. August 2019];155:106161. Erhältlich bei: https://linkinghub.elsevier.com/retrieve/pii/S0920121119301810
Vererbung und genetische Beratung im Mosaikismus.

- Mosaikkrankheiten entstehen aufgrund einer postzygotischen De-novo-Mutation, die beim Individuum selbst aufgetreten ist, und werden (per Definition) nicht vererbt.
- Eine Übertragung ist nur möglich, wenn die betroffene Person Träger der Keimbahnmutation (Keimbahnmosaikismus) ist.
- Wenn die Krankheit übertragen wird, wird das klinische Erscheinungsbild bei den Nachkommen nicht mosaikartig sein, sondern in Form einer konstitutionellen Mutation.
Spezifische Behandlung
- Für einige Mosaikerkrankungen, insbesondere solche, die die Gene des PI3K/AKT-Signalwegs und des RAS/RAF-Signalwegs betreffen, gibt es spezifische Behandlungsalternativen.
Diagnoseprotokoll
🧠🧬 Klinischer Algorithmus: Pigmentärer Hautmosaikismus → Risiko für neurologische Entwicklungsstörungen
1️⃣ Bestätigen, dass es sich bei dem Hautmuster tatsächlich um ein Blaschkoid-Muster handelt
Klinische Schlüsselpunkte:
- „S“-förmige Linien am Rumpf, „V“-förmige Linien am Rücken, geschwungene Linien an den Gliedmaßen
- Beachtet Mittellinien (nicht dermatomisch, nicht vaskulär)
- Segmentale Hyper- oder Hypopigmentierung
👉 Ja nein Blaschko-Typ → geringere Wahrscheinlichkeit eines relevanten genetischen Mosaikismus.
2️⃣ Anfängliche Einstufung des neurologischen Risikos
🔴 Hohes Risiko (≥1 Kriterium):
- Ausgedehnte oder beidseitige Läsionen
- Betroffenheit im Gesichtsbereich oder auf der Kopfhaut
- Im Zusammenhang mit:
- Entwicklungsverzögerung
- Epilepsie
- Hypotonie / Spastik
- Makro-/Mikrozephalie
- Dysmorphe Merkmale
- Körperliche Asymmetrie
➡️ Direkt zur erweiterten neurologischen und genetischen Untersuchung übergehen.
🟡 Mittleres Risiko:
- Begrenzte Verletzungen
- Kind ohne Symptome oder mit leichten Entwicklungsverzögerungen
- Normale neurologische Untersuchung
➡️ Strukturierte Nachsorge + neuropsychologisches Screening.
🟢 Geringes Risiko:
- Kleine, lokal begrenzte Verletzung
- Keine weiteren Befunde
- Eindeutig normale Entwicklung
➡️ Klinische Nachsorge ohne anfängliche invasive Untersuchungen.
3️⃣ Neurologische Untersuchung empfohlen
🔹 Immer
- Ausführliche Entwicklungsgeschichte
- Gezielte neurologische Untersuchung
- Sprach- und Exekutivfunktions-Screening
🔹 Bei klinischem Verdacht
- EEG:
- Krise, Rückgang, TDL mit Schwankungen
- MRT des Gehirns (wenn möglich 3T):
- Epilepsie
- Gesamtverzögerung
- Neurologische Asymmetrie
- Verdacht auf eine kortikale Fehlbildung
📌 Die MRT kann auch bei zerebralem Mosaikismus unauffällig sein → Normalbefund ≠ Ausschluss.
4️⃣ Genetische Untersuchungen: Was sollte untersucht werden und aus welchem Gewebe?
❌ Was NICHT ausreicht
- Array oder Exom nur im Blut (häufiges falsch-negatives Ergebnis)
✔️ Empfohlene Strategie (gestaffelt)
Stufe 1
- Array-CGH oder SNP-Array im Blut
- Erkennt Aneuploidien oder CNVs mit hohem Prozentsatz
- Nützlich bei Fehlbildungen oder einer allgemeinen Entwicklungsverzögerung
Stufe 2 (falls der Verdacht weiterhin besteht)
- Genetische Untersuchung der betroffenen Hautstelle
- Stanzbiopsie
- Im Idealfall:
- Gezielte NGS
- Klinisches Exom mit hoher Sequenztiefe
- Vergleich zwischen betroffener Haut und Blut
Stufe 3 (spezifischer Phänotyp)
- Klinisch orientierte Panels:
- Epilepsie (PI3K-AKT-mTOR, mTOR, PIK3CA)
- Pigmentstörungen / neurokutane Störungen
- ASD + Makrozephalie
📌 Mosaike <10 % erfordern eine Tiefe von >300×.
5️⃣ Hautmuster mit der stärksten neurologischen Korrelation
| Hautmuster | Neurologisches Risiko |
|---|---|
| Ausgedehnte Ito-Hypomelanose | 🔴 Hoch |
| Bilaterale Blaschko-Linie | 🔴 Hoch |
| Verletzungen mit körperlicher Asymmetrie | 🔴 Hoch |
| Lokalisierte Segmentierung | 🟡 Variable |
| Kleiner, vereinzelter Fleck | 🟢 Niedrig |
6️⃣ Überwachung der neurologischen Entwicklung
Auch wenn Sie keine Symptome haben:
- Entwicklungsbeurteilung alle 6–12 Monate
- Sprache, Aufmerksamkeit, Koordination
- Niedrige Schwelle für frühzeitige Maßnahmen
👉 Viele Phänotypen sind evolutiv, keine vollständigen angeborenen Fehlbildungen.
7️⃣ Wichtige Botschaften für die Familie (sehr wichtig)
- ❌ Dies bedeutet weder eine Schuld noch einen Kausalzusammenhang mit der IVF
- ✔️ Es handelt sich um einen frühen biologischen Befund
- ✔️ Die meisten Kinder entwickeln keine schwere Behinderung
- ✔️ Früherkennung Verbesserung der funktionellen Prognose

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1.
Kinsler VA. Mosaikstörungen mit Auswirkungen auf die Pigmentierung – Teil 2: Wie stellt man eine genetische Diagnose? Br J Dermatol [Internet]. 1. Dezember 2025 [zitiert am 20. Dezember 2025];193(6):1047–55. Verfügbar unter: https://doi.org/10.1093/bjd/ljaf224
