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Molecular basis for allelic polymorphism of the maize Globulin-1 gene.

ABSTRACT: An abundant protein in maize (Zea mays L.) embryos is a storage globulin encoded by the polymorphic Glb1 gene. Several Glb1 protein size alleles and a null allele have been described. Here we report the isolation and nucleotide sequence analysis of genomic clones corresponding to two Glb1 size alleles (Glb1-L and Glb1-S) and to the Glb1-0 null allele. The Glb1-L and Glb1-0 alleles differ from Glb1-S by the presence of small nucleotide insertions which are imperfect or perfect duplications, respectively, of adjacent sequences. In the case of Glb1-L, the insertion is in-frame and results in a protein larger than that encoded by Glb1-S, whereas in Glb1-0 the insertion causes a translational frameshift which introduces a premature termination codon. Although steady-state levels of Glb1-0 transcripts are extremely low in Glb1-0/0 embryos, nuclear transcription assays indicate that the Glb1-0 gene is transcribed at a level comparable to that of Glb1-L. This suggests that the low amounts of Glb1-0 transcripts in the cytoplasm may be due to mRNA instability.

SUBMITTER: Belanger FC

PROVIDER: S-EPMC1204753 | biostudies-other | 1991 Nov

REPOSITORIES: biostudies-other

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Molecular basis for allelic polymorphism of the maize Globulin-1 gene.

Belanger F C FC Kriz A L AL

Genetics 19911101 3

An abundant protein in maize (Zea mays L.) embryos is a storage globulin encoded by the polymorphic Glb1 gene. Several Glb1 protein size alleles and a null allele have been described. Here we report the isolation and nucleotide sequence analysis of genomic clones corresponding to two Glb1 size alleles (Glb1-L and Glb1-S) and to the Glb1-0 null allele. The Glb1-L and Glb1-0 alleles differ from Glb1-S by the presence of small nucleotide insertions which are imperfect or perfect duplications, respe ...[more]

PMID: 1752424

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Project description:This study aims to investigate the relationship between single nucleotide polymorphisms (SNPs) of sex hormone binding globulin (SHBG) and type 2 diabetes mellitus (T2DM) in an Uighur population. One hundred and fourteen T2DM male patients (with a history of diabetes or diagnosed as diabetic by the oral glucose tolerance test) and 173 healthy males from the Uighur ethnic group were included in the study to test the following SNPs of SHBG: rs727428, rs1799941, rs6259, rs6257, rs858521, rs858518, rs3760213, and rs11078701. The body mass index (BMI), blood pressure, and waist circumference, and lipid, glucose, HbA1c, insulin, HOMA-IR, testosterone, and SHBG levels of enrolled individuals were measured. We used the t-test or rank sum test and Chi-square test to analyze the difference and compare numeration data, respectively, between the case and control groups. Comparisons among multiple groups were carried out using analysis of variance, and the correlation between variables was determined by nonparametric Spearman rank correlation analysis; multivariate logistic regression analysis was used to assess the risk of abnormal glucose in the two groups. There was a significant difference (P < 0.05) in BMI, blood pressure, and waist circumference, and lipid, glucose, HbA1c, insulin, and HOMA-IR levels between the case and control groups. The risk factors for diabetes included testosterone (P = 0.042) and SHBG (P = 0.001). The distribution of rs858521 (P = 0.001), rs1799941 (2.3%, P = 0.032), rs6259 (2.5%, P = 0.040), and rs727428 (3.4%, P = 0.016) was significantly different between the case and control groups (P < 0.05). In the control group, there was linkage disequilibrium (LD) between rs727428 and rs6259, while in the case group LD was found among rs858518, rs3760213, rs1799941, and rs6257. The frequency of rs858518-rs3760213-rs1799941-rs6257 haplotype TCGC was significantly different between the two groups (P = 0.033). Both testosterone and SHBGwere found to be risk factors of diabetes in the Uighur population, and SNPs of SHBG may contribute to T2DM.

Dataset Information

Molecular basis for allelic polymorphism of the maize Globulin-1 gene.

Publications

Molecular basis for allelic polymorphism of the maize Globulin-1 gene.

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