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Epilepsy boards > Epilepsy genes > Flashcards

Epilepsy genes Flashcards

1
Q

Genes associated with GEFs+ (3)
Important note on these

A

SCN1A
SCN1B
GABRG2
mutations are seen in only 10-20% of GEFS+ (why genetic testing is not often advised)

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2
Q

Genes associated with Dravet Syndrome

A

SCN1A (70-80%)

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3
Q

Hyperekplexia
AKA:
Onset (2)
Symptoms (3)
Associated genes (2)
Protein
Treatment of choice

A

AKA - Stiff baby syndrome
Onset
- usually infancy
- Can be delayed in adolecence / adulthood
Symptoms
- Generalized stiffness
- Nocturnal myoclonus
tonic spasms usually triggered by auditory or generalized stiffness
Associated genes
- GLRA1
- GLRB
Associated protein
- Inhibitory glycine receptor
Treatment of choice: Clonazepam

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4
Q

Epilepsy Genes - Benign Familial neonatal Seizures
- Inheritance
- Identified Genes (2)
- Affected protein
- Outcome

A

Inheritance: AD
Genes:
- KCNQ2
- KCNQ3
Protein: M-channel subunit of voltage-gated potassium channel
- Benign outcome

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5
Q

Epilepsy Genes: Benign female Neonatal-infantile seizures
- Inheritance
- Identified Gene
- Affected protein
- Outcome/prognosis

A

Inheritance: Autosomal Dominant
Identified Gene: SCN2A
Protein: sodium channel subunit
Outcome/Prognosis: Benign
- normal development
- Seizures from 2 days to 6 months
- Self-resolve

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6
Q

Epilepsy Genes: Ohtahara Syndrome
- Inheritance:
- Identified Genes (2)

A

Inheritance: variable
Genes
- STXBP1
- ARX

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7
Q

Epilepsy Genes: Early-onset Spasms
- Inheritance:
- Genes

A

Inheritance: X-linked (girls only, possibly lethal in males
Gene: CDKL5

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8
Q

Epilepsy Genes: X-linked infantile spasms
- Inheritance
- Gene

A
  • Inheritance: Boys
  • Gene: ARX
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9
Q

Epilepsy Genes: Childhood absence epilepsy with Febrile Seizures
- Inheritance
- Gene
- Protein

A

Inheritance: AD
Gene: GABRG2
Protein: GABAa receptor subunit

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10
Q

Epilepsy Genes: Epilepsy and mental retardation limited to females
Inheritance
Gene
Protein

A

Inheritance: X-linked (only seen in heterozygous females
Gene: PCDH19
Protein: procadherin

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11
Q

Epilepsy Genes, Early onset Absence Epilepsy
Inheritance
Gene
Protein

A

Inheritance: Autosomal Dominant
Gene: SLC2A1
Protein: GLUT1 > treat w/ Keto diet

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12
Q

Epilepsy Genes: Juvenile Myoclonic Epilepsy
Inheritance
Gene (2)
Protein (2)

A

Inheritance: Autosomal Dominant
Genes
- GABRA1 - GABAa receptor
- EFHC1 - EF hand motif protein

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13
Q

Epilepsy Genes: ADNFLE
- Inheritance
- Genes
- affected protein

A

Inheritance: autosomal Dominant
Genes:
- CHRNA4
- CHRNA1
- CHRNB2
Protein: nicotinic acetylcholine receptor subunits

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14
Q

Epilepsy Genes: Autosomal Dominant partial epilepsy with Auditory features (ADPEAF)
- Inheritance
Gene

A

Inheritance: Autosomal Dominant
Gene: LGI1

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15
Q

Epilepsy Genes: Myoclonic Epilepsy with Ragged Red Fibers
- Inheritance
- Gene
- Best confirmation test

A

Inheritance: Mitochondrial
Gene (tRNA)
Diagnosed by muscle biopsy

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16
Q

Epilepsy Genes: Unverricht-Lundborg
- Inheritance
- Gene
- Protein

A

Inheritance: autosomal recessive
- Gene: EPM1 (CSTB)
- protein: Cystatin B

17
Q

Epilepsy Genes: Lafora Disease
Inheritance
Gene (2)
Protein (2)

A

Inheritance: autosomal recessive
Genes
- EPM2A
- NHRC1 (EPM2B)
Proteins
- Laforin
- malin

18
Q

Epilepsy Genes: Neuronal ceroid lipofuscinosis (NCL)
Inheritance (2)
Genes (9)
Type of disorder

A

Inheritance
- Adult onset: Autosomal dominant
- all others: autosomal recessive
Genes
- CLN1-8
- PPT1
Type of disorder: Lysosomal storage disease

19
Q

Epilepsy Genes: Sialidosis
- Inheritance
- Gene
- Affected Protein
- Other test

A

Inheritance: Autosomal recessive
Gene: NEU
Protein: neuraminidase
Other test: increased urinary oligosaccharides

20
Q

Epilepsy Genes: Dentatorubral-pallidoluysian atropy (DRPLA)
- Inheritance
- Gene
- Type of disroder

A

Inheritance: Autosomal dominant
Gene: ATN1
type of disorder: Trinucleotide repeat

21
Q

Epilepsy Genes: Lissencephaly
Inheritance:
Gene
Specifics about this type of Lissencephaly

A

Inheritance: autosomal dominant
Gene: LIS1
Specifcs: Posterior predominant

22
Q

Epilepsy Genes: X-linked lissencephaly / double cortex syndrome / Subcortical band heterotopia
- Inheritance
- Gene

A

Inheritance: X-linked dominant
Gene: DCX

23
Q

DCX mutation presentations:
Males
Females

A

Males
- lissencephaly
- epilepsy
- DMD
Females
- broad heterotopic zone
- Frontally predominant

24
Q

Epilepsy Genes: Periventricular nodular heterotopia
Inheritance:
Genes (2)
Features specific to second gene mutation

A

Inheritance:
- X-linked dominant (FLNA)
- Autosomal recessive (ARFGEF2)
- Also with microcephaly

25
Q

Epilepsy Genes: Mitochondrial encephalopathy, lactic acidosis, and stroke-like episodes (MELAS)

A

Inheritance: mitochondrial
Gene: tRNA - Leu

26
Q

Epilepsy Genes: Alpers Syndrome
- Inheritance
- Gene
- Protein

A

Inheritance: autosomal recessive
Gene: POLG1
Protein: Nuclear gene for DNA polymerase Gamma

27
Q

Epilepsy Genes: Fragile X
Inheritance
Protein
Type of disorder

A

Inheritance: autosomal Dominant
Gene: FMR1
Type of disorder: Trinucleotide repeat

28
Q

Epilepsy Gene: Rett syndrome
- Inheritance
- Gene

A

Inheritance: x-linked
Gene MECP2

29
Q

Epilepsy Genes: Angelman syndrome
Genetic test

A

DNA methylation analysis (UBE3A0

30
Q

Gene mutations found in Childhood absence epilepsy (2)

A

GABRG2
GABRA1

31
Q

Patient with 6 fingers is found to have a hypothalamic hamartoma.
- What condition and gene could be causing this?
- What else should you look for? (4)

A

Pallister Hall syndrome (LGI-1)
Other features
- Fused fingers
- Bifid epiglottis
- Imperforate anus
- kidney abnormalities

32
Q

Glut1 disorder
- diagnostic criteria (3)
- Associated mutation

A

Hypoglycorrhachia with normoglycemia and low-to-normal CSF lactate
- CSF Glucose <60 mg/dL (3.3 mmol/dL) but most cases needs to be <40 mg/dl (2.2 mmol/L)
- CSF: blood glucose ratio <0.4
Associated mutation
- SLC2A1 (90%) - de novo

33
Q

Patient with intractable absence seizures and mild developmental delays. What should you rule out and how (3)? How common is this?

A

GLUT1 deficiency syndrome
Tests
- Low lactate
- Glucose <40
- Gene test for SLC2A1
how common
10% of early-onset absence seizure (<4 years)

34
Q

“buzzword” seizure with ring 20 chromosome syndrome

A

Nocturnal frontal seizures (confusion / wandering)

Epilepsy boards (23 decks)

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