Aplastic Anemia and bone marrow failure syndromes Flashcards
What are the physical features seen in Fanconi aplastic anemia?
Thumb abnormalities, short stature, microcephaly, patchy brown pigmentation.
What is the underlying abnormality in Fanconi Anemia (what genes are involved)?
Most patients have mutations involving FANCA or FANCC which are involved in DNA repair.
What is characteristic about the DNA in Fanconi anemia patients?
Their DNA is hypersensitive to damage induced by DNA crosslinking agents (e.g. DEB and mitomycin C).
What is the mode of inheritance for most patients with Fanconi Anemia?
Autosomal recessive
How do you diagnose Fanconi Anemia?
By doing chromosome breakage study, the report will tell you the percentage of cells with chromosome aberrations.
How do patients with short telomere syndromes present?
Nail dystrophy, skin hyperpigmentation, early graying of hair, and oral leukoplakia.
What are the modes of inheritance seen with short telomere syndrome? What is the defect seen here?
Autosomal dominant, autosomal recessive, and X-linked. The teleomerase enzyme is missing to add telomeres.
What malignancies are patients with Fanconi Anemia at risk for?
MDS/AML! Also at risk for squamous cell carcinoma of the Head/neck, esophageal, and vulvar/vaginal tumors. Also hepatocellular carcinoma
What are some complications seen in short telomere syndrome?
Pulmonary Fibrosis, cirrhosis, vascular complications (AV malformations), hepatopulmonary syndrome.
What malignancies are short telomere patients at risk of?
Squamous cell carcinoma of head/neck, anogenital, and GI cancers.
What treatment can you offer for short telomere syndrome besides allogeneic transplant?
Androgens-oxymetholone or danazol.
What is the defect seen in GATA 2 deficiency?
A GATA 2 mutation causes loss of expression or function of the Zinc finger transcription factor required for hematopoiesis and lymphatic development.
What are some clinical features seen in GATA 2 deficiency?
Congenital deafness, lymphedema, autism/ADHD, interstitial lung dx, warts, frequent infections (mycobacteria infections), w/wo cytopenias.
What cytogenetic abnormality is commonly seen in GATA 2 def and what does this suggest?
Monosomy 7 and trisomy 8, can suggest development of MDS/AML.
What are the clinical features of SMAD 9/9L?
Ataxia, adrenal hypoplasia, ambiguous genitalia