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R. Borie et al.

 

 

Table 24.2  Common variants associated with idiopathic pulmonarybrosis

Gene

Single nucleotide polymorphism (SNP)

AKAP13

rs62025270

 

 

ATP11A

rs1278769

 

 

CDKN1A

rs2395655

 

rs733590

DPP9

rs12610495

DSP

rs2076295

 

 

ELMOD2

Unknown

 

 

FAM13A

rs2609255

 

 

HLA-DRB1

rs2395655

IL1RN

rs408392

 

rs419598

 

rs2637988

 

 

IL8

rs4073

 

rs2227307

MAPT

rs1981997

MDGA2

rs7144383

MUC2

rs7934606

 

 

MUC5B

rs35705950

 

 

OBFC1

rs11191865

 

 

SPPL2C

rs17690703

 

 

TERC

rs6793295

TERT

rs2736100

TGFB1

rs1800470

TLR3

rs3775291

TOLLIP

rs111521887

 

rs5743894

 

rs2743890

TP53

rs12951053

 

rs12602273

 

 

Telomere Related Genes

Genetic

Telomeres are regions of non-coding repetitive nucleotide repeats (TTAGGG) at the ends of chromosomes that protect them from deterioration during mitosis or fusion with neighboring chromosomes. The telomerase complex is a group of proteins and RNA that catalyzes the addition of these nucleotide repeats to the ends of chromosomes. There are numerous components to the telomerase complex, including telomerase reverse transcriptase (TERT) and the telomerase RNA component (TERC, encoded by the TERC gene, also known as TR or hTR), which are essential for normal operation and telomere integrity. The telomerase complex also requires the activity of other proteins, such as the regulator of telomere elongation 1 (RTEL1), the poly(A)-speci c ribonuclease (PARN), and the nuclear assembly factor 1 (NAF1). All have been involved in in pulmonary brosis [15, 16]. Numerous other genes have been implicated in telomere maintenance beyond telomerase complex, and they have been grouped in telomere related genes (TRG) group.

ILD at 78

MDS and ILD

at 55

Aplasia at

20

Fig. 24.3  Pedigree suggestive of a telomere-related genes (TRG) mutation. Filled in blue, patients with interstitial lung disease (ILD),lled in green patients with hematological disease (MDS, myelodysplastic syndrome)

Heterozygous mutations of TERT (≈15%), RTEL1 (5–10%), PARN (≈5%), and TERC (≈3%) have been implicated in familial forms of pulmonary brosis. Mutations in DKC1, NAF1, and TINF2 have more rarely been reported (Fig. 24.2) [15, 1725]. Mutations of TERT and TERC were initially found in only about 1–3% of sporadic IPF cases [26, 27]. However, rare variants within TERT, TERC, PARN, and RTEL1 have been reported in 149 (9%) of 1739 IPF patients included in 4 clinical trials (INSPIRE, CAPACITY, ASCEND, and RIFF), 29 (11.3%) of 262 IPF patients evaluated in one center before lung transplantation, 33 (9.3%) of 353 patients with chronic hypersensitivity pneumonitis (HP), and in 11 of 101 patients with rheumatoid arthritis-ILD [2831]. However, for the most part, conformation of the pathogenicity of the genetic variants in these disorders will require further study.

There are no frequent mutations nor hotspots reported in the TRG. Environmental exposure modi es the risk of pulmonary brosis developing in a carrier of TERT, TERC, or RTEL1 mutations (also known as penetrance) [19, 32, 33].

Telomere Length

Telomere length can be measured on circulating leucocytes by Flow-FISH, qPCR, or Southern blot and compared with

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