B2B W4T2P2

Question 1

What is the significance of single nucleotide polymorphisms (SNPs) in schizophrenia research?

Answer 1

SNPs act as biological markers to help identify genes associated with disease

SNPs are DNA sequence variations occurring when a single nucleotide in the genome differs within the population.

Question 2

How many schizophrenia-associated genetic loci were identified in the genome-wide association analysis?

Answer 2

108

These loci contain genes associated with different pathways related to schizophrenia.

Question 3

What are de novo mutations and their relevance to schizophrenia?

Answer 3

New mutations not inherited from parents, often occurring in genes coding for synaptic proteins

They suggest that synaptic networks may be altered in some cases of schizophrenia.

Question 4

What common link among different neurodevelopmental disorders is highlighted in recent findings?

Answer 4

Deficits in cognition

Cognition may be at the core of schizophrenia and other disorders.

Question 5

What are copy-number variants (CNVs) and their association with schizophrenia?

Answer 5

DNA segments that are repeated, conferring risk of autism or schizophrenia

CNVs affect cognition in controls.

Question 6

What role do GABAergic interneurons play in cognitive function?

Answer 6

They are critical for the synchrony of pyramidal cells

Disruption in GABAergic signalling may link cognitive deficits in schizophrenia.

Question 7

What changes have been observed in gamma oscillatory rhythms in schizophrenia patients?

Answer 7

Changes compared to controls, related to cognitive function deficits

Modulated by parvalbumin-expressing GABAergic interneurons.

Question 8

What synaptic markers show a decrease in schizophrenia patients?

Answer 8

• GABA-transporter GAT-1
• GAD67

These markers belong to fast-spiking interneurons that are altered in schizophrenia.

Question 9

What is the relationship between glutamate levels and GABA in schizophrenia?

Answer 9

Increased glutamate levels suggest a decrease in GABA

This leads to an imbalance between excitation and inhibition.

Question 10

What genetic alterations are linked to susceptibility to schizophrenia?

Answer 10

• Neuregulins 1 and 3
• ErbB4 receptor

Neuregulins are trophic factors that signal by interacting with ErbB4 receptor tyrosine kinases.

Question 11

What effect do rare mutations in the ErbB4 gene have on schizophrenia?

Answer 11

They lead to the expression of a truncated protein affecting the kinase domain

A deletion in ErbB4 has been linked to intellectual disability.

Question 12

Could a genetic alteration affecting ErbB4 signalling impact the development of interneurons?

Answer 12

Yes, it could underlie the pathophysiology of schizophrenia

This suggests a potential mechanism linking genetic factors to the disorder.