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[Diffuse familial interstitial pulmonary fibrosis. Study of a family]
Abstract:
A study of the genealogy of a 53 year old lady (A.M...) suffering from diffuse interstitial pulmonary fibrosis (FID) has revealed several cases of FID in her forbears and relations. Two brothers of A.M... died of histologically proven FID; FID was also discovered in one of their daughters. A sister died young of some unclassified respiratory problem. Two cousins died likewise at a young age of acute FID proven histologically. The level of spontaneous pneumothorax was particularly elevated in this family which represented a clinical peculiarity when compared to sporadic FID. The most probable mode of transmission of familial FID is autosomal dominant with variable penetrance. The HLA group seen in A.M... showed the A2 and B12 alleles. The B12 allele was also present in the niece of A.M...
Insights
This study reveals a familial pattern of diffuse interstitial pulmonary fibrosis (FID) with a high incidence of spontaneous pneumothorax. Autosomal dominant inheritance with variable penetrance is the likely transmission mode for this familial FID.
Area of Science:
- Pulmonary Medicine
- Genetics
- Immunology
Background:
- Diffuse interstitial pulmonary fibrosis (FID) is a progressive lung disease with varying etiologies.
- Familial cases suggest a genetic predisposition, but specific inheritance patterns are not always clear.
- Understanding familial FID is crucial for diagnosis and genetic counseling.
Observation:
- A genealogical study identified multiple family members with histologically confirmed diffuse interstitial pulmonary fibrosis (FID).
- The proband's family exhibited a notably high rate of spontaneous pneumothorax, a rare occurrence in sporadic FID.
- Affected individuals included siblings, a niece, and cousins, indicating a potential hereditary link.
Findings:
- The familial FID presented with a high prevalence of spontaneous pneumothorax.
- The most probable mode of inheritance is autosomal dominant with variable penetrance.
- Human Leukocyte Antigen (HLA) typing revealed shared alleles (A2, B12) in the proband and a niece, suggesting potential genetic markers.
Implications:
- This family's history strongly supports a genetic basis for certain forms of FID.
- The findings may aid in identifying individuals at risk for familial FID and associated complications like pneumothorax.
- Further research into the genetic and immunological factors could lead to targeted therapies for familial interstitial lung diseases.