Nitrogen 3 Flashcards

1
Q

What are inherited metabolic disorders?

A

Group of genetic diseases involving metabolic defects

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What are interited metabolic disorders usually due to?

A

A single gene

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What do inherited metabolic disorders usually result in?

A

Deficiencies of key enzymes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What does the deficiency of key enzymes cause?

A

Abnormal synthesis of proteins, amino acids, carbohydrates or lipids

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Are inherited metabolic disorders common?

A

No, they are typically rare

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What are the consequences of a key enzyme defect?

A

Decreased formation of desired product

Accumulation of substance before the enzyme with the defect

Increase formation of other, unwanted metabolites

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What kind of inheritance do most inherited metabolic disorders show?

A

Autosomal reccesive inheritance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What does autosomal dominance inheritance look like?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What does autosomal recessive inheritance look like?

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What are some common clinical features of inherited metabolic disorder presening in childhood?

A

Acidosis

Failure to thrive

Vomiting

CNS dysfunction

Hypoglycaemia

Unusual odour

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Why do proteins need to be immedietely metabolised?

A

There is no storage facility like carbohydrates

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Where does the urea cycle happen?

A

Split between the mitochondrial matrix and cytosol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What happens in the urea cycle?

A

Ammonia goes in and urea comes out

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What are urea cycle defects?

A

Defects in any of the 6 enzymes involved

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

How many inherited disorders of the urea cycle are there?

A

6

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the most common inherited urea cycle defect?

A

OTC deficiency

17
Q

What kind of inheritance is OTC dificiency?

A

X linked inheritance

18
Q

What inherited urea cycle defects have autosomal inheritance?

A

All of them apart from OTC dificiency

19
Q

What does OTC dificiency cause?

A

Hyperammoniaemia, which is elevated blood ammonia which is highly toxic

20
Q

What could amino acids be metabolised into?

A

Other amino acids

Hormones

Pigments

Neurotransmitters

21
Q

What do inherited gene defects cause?

A

Decreased enzyme activity

22
Q

What does decreased enzyme activity cause?

A

Decreased product

Increased precurder

Alternative metabolic products that may be toxic

23
Q

What is phenylketonuria (PKU)?

A

Absence/dificiency of phenylalanine hydroxylase (PAH)

24
Q

What kind of inherited disorder is PKU?

A

Autosomal recessive disorder

25
Q

What does PKU cause?

A

Increased phenylalanine levels which is toxic, and the production of alternative metabolic products

26
Q

What happens to untreated people with PKU?

A

Impaired brain development

27
Q
A
28
Q

What can the alternative metabolic products produced due to PKU do?

A

Cross the blood brain barrier and cause irreversible neurological damage

29
Q

What are clinical factors of PKU?

A

Normal at birth

Phenylalanine rises rapidly after feeding is established

Delayed brain development visible by 6 months

30
Q

How is PKU diagnosed?

A

Screening test

Confirmation of increased phenylalanine in the lab

Decreased blood tyrosine levels

31
Q

What is the treatment of PKU?

A

Low protein diet

Maintain bloody phenylalanine levels

Maintain blood tyrosine levels at the upper limit