Empreinte parentale Flashcards

1
Q

Combien de gènes concernés par l’empreinte parentale ?

A

une centaine

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2
Q

4 Sd très fréquents liés aux GSE ?

A

Silver Russel (11)
Beckwith-Wiedeman (11)
Prader Willi (15)
Angelman (15)

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3
Q

Quel processus entraine la fermeture de la chromatine ?

A

METHYLATION

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4
Q

Sd de Prader Willi, quelle empreinte ?

A

GSE maternelle

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5
Q

prader Willi manifestations

A

hydramnios
hypotonie axiale
difficultés succion
puis hyperphagie & obésité (pas de sensation de satiété )

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6
Q

localisation prader willi ?

A

15q11q13

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7
Q

mode de survenue Prader Willi ?

A

délétion : 65%
disomie uniparentale maternelle: 25%

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8
Q

Angelman quelle empreinte ?

A

GSE paternelle !

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9
Q

localisation Angelman ?

A

15q11q13

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10
Q

manifestation clinique Angelman

A

Déficience intellectuelle
pas de langage
microcéphalie
ataxie
jovial
démarche ébrieuse

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11
Q

Prévalence Angelman et Prader Willi ?

A

1/15000 - 1/20 000

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12
Q

Mode de survenue Angelman ?

A

70% délétion chr mat
20% mutation ponctuelle (gène UBE3A)

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13
Q

Manifestations silver russel ?

A

petite taille
incurvation 5eme doigt
difficultés pour manger

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14
Q

Manifestations Beckwith-Wiedeman ?

A

hydramnios
hypoglycémie
croissance ++
organomégalie
omphalocèle

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