title: Rrp1B gene polymorphism (1307T>C) in metastatic progression of breast cancer.
abstract: Rrp1B (ribosomal RNA processing1 homolog B) is a novel candidate metastasis modifier gene in breast cancer. Functional gene assays demonstrated that a physical and functional interaction existing between Rrp1b and metastasis modifier gene SIPA1 causes reduction in the tumor growth and metastatic potential. Ectopic expression of Rrp1B modulates various metastasis predictive extra cellular matrix (ECM) genes associated with tumor suppression. The aim of this study is to determine the functional significance of single nucleotide polymorphism (SNP) in human Rrp1B gene (1307 T>C; rs9306160) with breast cancer development and progression. The study consists of 493 breast cancer cases recruited from Nizam's Institute of Medical Sciences, Hyderabad, and 558 age-matched healthy female controls from rural and urban areas. Genomic DNA was isolated by non-enzymatic method. Genotyping was done by amplification refractory mutation system (ARMS-PCR) method. Genotypes were reconfirmed by sequencing and results were analyzed statistically. We have performed Insilco analysis to know the RNA secondary structure by using online tool m fold. The TT genotype and T allele frequencies of Rrp1B1307 T>C polymorphism were significantly elevated in breast cancer (χ (2); p = <0.008) cases compared to controls under different genetic models. The presence of T allele had conferred 1.75-fold risk for breast cancer development (OR = 1.75; 95% CI = 1.15-2.67). The frequency of TT genotype of Rrp1b 1307T>C polymorphism was significantly elevated in obese patients (χ (2); p = 0.008) and patients with advanced disease (χ (2); p = 0.01) and with increased tumor size (χ (2); p = 0.01). Moreover, elevated frequency of T allele was also associated with positive lymph node status (χ (2); p = 0.04) and Her2 negative receptor status (χ (2); p = 0.006). Presence of Rrp1b1307TT genotype and T allele confer strong risk for breast cancer development and progression.
authors.affiliation: Department of Genetics, Osmania University, Hyderabad, 500007, India.
authors.forename: Santhoshi Rani
authors.initials: SR
authors.lastname: Nanchari
authors.forename: Anuradha
authors.initials: A
authors.lastname: Cingeetham
authors.forename: Phannibhushann
authors.initials: P
authors.lastname: Meka
authors.forename: Surekha
authors.initials: S
authors.lastname: Damineni
authors.forename: Nageshwarao
authors.initials: N
authors.lastname: Tipirisetti
authors.forename: Chiranjeevi
authors.initials: C
authors.lastname: Padala
authors.forename: Sandhya
authors.initials: S
authors.lastname: Annamaneni
authors.forename: Surekha
authors.initials: S
authors.lastname: Rani Hanumanth
authors.forename: Raghunadha Rao
authors.initials: RR
authors.lastname: Digumarthi
authors.forename: Vishnupriya
authors.initials: V
authors.lastname: Satti
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D051017:Apoptosis Regulatory Proteins / Q000235:genetics*; D001943:Breast Neoplasms / Q000235:genetics* / Q000473:pathology; D002868:Chromosomal Proteins, Non-Histone / Q000235:genetics*; D018450:Disease Progression; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D005787:Gene Frequency; D056726:Genetic Association Studies; D020022:Genetic Predisposition to Disease; D006801:Humans; D008875:Middle Aged; D009362:Neoplasm Metastasis / Q000235:genetics* / Q000473:pathology; D020641:Polymorphism, Single Nucleotide / Q000235:genetics
chemical_list: D051017:Apoptosis Regulatory Proteins; D002868:Chromosomal Proteins, Non-Histone; C574722:RRP1B protein, human