Gene expression profile in diabetic KK/Ta mice

Area of Science:

• Genomics
• Molecular Biology
• Nephrology

Background:

• Diabetic nephropathy (DN) is a major complication of diabetes.
• Identifying genetic susceptibility factors for DN is crucial for understanding its pathogenesis.
• KK/Ta mice serve as a model for studying diabetic complications.

Purpose of the Study:

• To identify genes associated with diabetic nephropathy susceptibility.
• To investigate the gene expression profile of diabetic KK/Ta mouse kidneys.
• To explore candidate genes located near the albuminuria quantitative trait locus (UA-1).

Main Methods:

• Gene expression profiling using GeneChip Expression Analysis (Affymetrix Murine Genome U74Av2 array).
• Comparison of gene expression between diabetic KK/Ta mice and non-diabetic BALB/c mice.
• Validation of selected differentially expressed genes using competitive reverse transcription-polymerase chain reaction (RT-PCR).

Main Results:

• 98 known genes and 31 expressed sequence tags (ESTs) were differentially expressed in KK/Ta mouse kidneys.
• Genes involved in renal function, extracellular matrix remodeling, signal transduction, metabolism, and protein handling showed altered expression.
• Candidate genes near the UA-1 locus, including Sdc4, Ahcy, Sstr4, and MafB, exhibited differential expression.

Conclusions:

• The gene expression profile of KK/Ta mouse kidneys differs significantly from that of age-matched BALB/c mice.
• Altered gene expression in the vicinity of the UA-1 locus may play a role in the development of albuminuria in diabetic KK/Ta mice.
• These findings provide insights into the genetic basis of diabetic nephropathy.