Growth hormone insensitivity with immune dysfunction caused by a STAT5B mutation in the south of Brazil: evidence for a founder effect

Author(s)

Renata C. Scalco ; Fernanda T. Gonçalves ^[2] ; Hadassa C. Santos ^[3] ; Mari M. S. G. Cardena ^[4] ; Carlos A. Tonelli ^[5] ; Mariana F. A. Funari ^[6] ; Rosana M. Aracava ^[7] ; Alexandre C. Pereira ^[8] ; Cintia Fridman ^[9] ; Alexander A. L. Jorge ^[10]

• Document type: Journal article
• Source: GENETICS AND MOLECULAR BIOLOGY; v. 40, n. 2, p. 436-441, 2017-06-05.

Abstract

ABSTRACT Homozygous STAT5B mutations causing growth hormone insensitivity with immune dysfunction were described in 10 patients since 2003, including two Brazilian brothers from the south of Brazil. Our objectives were to evaluate the prevalence of their STAT5B mutation in this region and to analyze the presence of a founder effect. We obtained DNA samples from 1,205 local inhabitants, 48 relatives of the homozygous patients and four individuals of another affected family. Genotyping for STAT5B c.424_427del mutation and for two polymorphic markers around it was done through fragment analysis technique. We also determined Y-chromosome and mtDNA haplotypes and genomic ancestry in heterozygous carriers. We identified seven families with STAT5B c.424_427del mutation, with 33 heterozygous individuals. The minor allelic frequency of this mutation was 0.29% in this population (confidence interval 95% 0.08-0.5%), which is significantly higher than the frequency of other pathogenic STAT5B allele variants observed in public databases (p < 0.001). All heterozygous carriers had the same haplotype present in the homozygous patients, found in only 9.4% of non-carriers (p < 0.001), supporting the existence of a founder effect. The Y-chromosome haplotype, mtDNA and genomic ancestry analysis indicated a European origin of this mutation. Our results provide compelling evidence for a founder effect of STAT5B c.424_427del mutation. (AU)

• FAPESP's process: 16/03318-0 - Growth hormone and estrogen pharmacogenetics in patients with Turner Syndrome
• Grantee: Renata da Cunha Scalco Tirapeli
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 10/19809-6 - Phenotype related with p.L142fsX161 STAT5B mutation in the heterozygous state
• Grantee: Alexander Augusto de Lima Jorge
• Support Opportunities: Regular Research Grants
• FAPESP's process: 11/15078-0 - Study of the phenotype associated to heterozigous STAT5B mutation p.L142fsX161
• Grantee: Renata da Cunha Scalco Tirapeli
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)