Final Review Flashcards
Which of the following nail deformities is most associated with Psoriasis?
Clubbing
1
Koilonychia
2
Splinter Haemorrhage
3
Beau’s Lines
4
Nail Pitting
5
Which of the following nail deformities is most associated with Psoriasis?
Clubbing
1
Koilonychia
2
Splinter Haemorrhage
3
Beau’s Lines
4
Nail Pitting
5
Dx? [1]
Tx - if non severe? [4] or severe? [2]
top: trophozoite infecting a reticulocyte
bottom: trophozoite infecting an RBC with Schuffner’s dots (eosinophilic) with preserved cell morphology
suggestive of plasmodium vivax - similar to ovale but without RBC shape change
treated with **oral artemeter + lumefantrine or quinine sulphate or doxycyline **
consider artesunate + quinine dihydrochloride IV if severe infection
Dx
classic findings associated with plasmodium malariae which only affects senescent RBCs
What is the most common primary immunodeficiency syndrome? [1]
Selective IgA deficiency
Defect in moving material into lysosomes X Giant granules = ?
Defect in moving material into lysosomes x Giant granules = ?
Chediak-higashi syndrome
For symptomatic classical CGD the mainstay of treatment is []
For symptomatic classical CGD the mainstay of treatment is definitive correction i.e. HSCT
Name 3 x-linked dominant diseases [3]
retinitis pigmentosa
chrondrodysplasia
alport syndrome (type IV collagen gene defect)
What is the definition of incidence?
Incidence = number of new cases (or deaths) of a disease per 100,000 people per year
Describe the pathophysiology of Fragile-X syndrome
Fragile X syndrome is caused by a mutation in the FMR1 (fragile X mental retardation 1) gene on the X chromosome.
The FMR1 gene codes for the fragile X mental retardation protein, which plays a role in cognitive development in the brain.
Long ears; thin face
Describe the inheritence of Fragile-X mental retardation [1]
It is X-linked dominant
Males are always affected, but females can vary in how much they are affected.
This is because females have a spare normal copy of the FMR1 gene on their other X chromosome.
Describe the features of Fragile X syndrome in males and females
Features in males
* learning difficulties
* large low set ears, long thin face, high arched palate
* macroorchidism
* hypotonia
* autism is more common
* mitral valve prolapse
Features in females (who have one fragile chromosome and one normal X chromosome)
* range from normal to mild
What is the inheritence pattern of Hypophosphatamic rickets? [1]
Hereditary hypophosphataemic rickets.
- The most common form is x-linked dominant, however it also has other modes of inheritance.
- There is a rare form of rickets caused by genetic defects that result in low phosphate in the blood
Describe the pathophysiology of X-linked dominant-Hypophosphatamic rickets [3]
- Suggested that the phosphate regulating endopeptidase X-linked (PHEX) enzyme regulates fibroblast growth factor 23 (FGF23).
- This protein normally inhibits the kidneys’ ability to reabsorb phosphate into the bloodstream.
- There is an increase of FGF23 in patients but no direct link yet between the proteins.
Describe how APP and PSEN genes contribute to AD pathophysiology [2]
APP: when cleaved by B & Y secretases get ABP - accumulates to cause amyloid plaques in brain
PSEN [1&2] function as part of the complex the cleaves in the y site - so if have hyperfunction of PSEN then causes AD
Name a gene that has been found to be a suppressor gene for AD [1]
BACE2
Describe the features of:
* Trisomy 13 (Patau’s syndrome)
* Trisomy 18 (Edwards syndrome)
Trisomy 13 (Patau’s syndrome):
* Microcephalic, small eyes
* Cleft lip/palate
* Polydactyly
* Scalp lesions
Trisomy 18 (Edwards syndrome):
* Micrognathia
* Low-set ears
* Rocker bottom feet
* Overlapping of fingers
47, XXY refers to which sex chromosome aneuploidy? [1]
Describe the features of this syndrome [+]
47, XXY: Klinefelter syndrome
* Taller height
* Wider hips
* Gynaecomastia
* Weaker muscles
* Small testicles
* Reduced libido
* Shyness
* Infertility
* Subtle learning difficulties (particularly affecting speech and language)
Describe the pathophysiology of Rieger syndrome [1]
A deletion of REIG gene from chromosome 4
When gene gets moved to chromosome 12, becomes less active (and acts like a deletion)
Iris of the eye fails to develop - may lead to blindness later in life
- typically develop raised intra-ocular pressure and glaucoma
What is the genetic and pathophysiological features of Tay-Sachs? [3]
Tay-Sachs disease is caused by mutations in the HEXA gene located on chromosome 15
- causes progressive damage to the nerve cells, particularly neurons in the brain, causing the characteristic neurological symptoms of the disease
- Tay-Sachs disease follows an autosomal recessive pattern of inheritance
- Symptoms of Tay-Sachs disease typically manifest in early infancy, usually around 3 to 6 months of age.
What is the genetic and pathophysiological features of achondroplasia? [3]
Achondroplasia is an autosomal dominant disorder associated with short stature. It is caused by a mutation in the fibroblast growth factor receptor 3 (FGFR-3) gene. This results in abnormal cartilage giving rise to:
* short limbs (rhizomelia) with shortened fingers (brachydactyly)
* large head with frontal bossing and narrow foramen magnum
* midface hypoplasia with a flattened nasal bridge
* ‘trident’ hands
* lumbar lordosis
In most cases (approximately 70%) it occurs as a sporadic mutation. The main risk factor is advancing parental age at the time of conception. Once present it is typically inherited in an autosomal dominant fashion.
Retinitis pigmentosa primarily affects [] cells in the retina, particularly [], which are responsible for peripheral and night vision.
Retinitis pigmentosa primarily affects photoreceptor cells in the retina, particularly rods, which are responsible for peripheral and night vision.
What are the features of Retinitis pigmentosa? [3]
Features
* night blindness is often the initial sign
* tunnel vision due to loss of the peripheral retina (occasionally referred to as funnel vision)
* fundoscopy: black bone spicule-shaped pigmentation in the peripheral retina, mottling of the retinal pigment epithelium