A polymorphic form of steroidogenic factor 1 associated with ACTH receptor deficiency in mouse adrenal cell mutants.

Abstract:

:We have described a family of adrenocortical tumor cell mutants (including clones OS3, Y6, and 10r9) that are resistant to ACTH because they fail to express the gene encoding the ACTH receptor (MC2R). The MC2R deficiency results from a mutation that impairs the activity of the nuclear receptor steroidogenic factor 1 (SF1) at the MC2R promoter. In this report, we show that ACTH resistance in the mutant clones is associated with a Sf1 gene that has Ser at codon 172 instead of Ala. In two of the three mutant clones, this Sf1 allele is amplified together with flanking DNA from chromosome 2 that includes the genes encoding germ cell nuclear factor and the beta-type proteosome subunit Psmb7. SF1(A172) and SF1(S172) exhibit little or no difference in transcriptional activity in SF1-dependent reporter gene assays, suggesting that SF1(S172) per se is not directly responsible for the loss of MC2R expression. Instead, the Sf1(S172) allele appears to be a marker of ACTH resistance in this family of adrenocortical tumor cell mutants, possibly reflecting the activity of a neighboring gene.

journal_name

Ann N Y Acad Sci

authors

Schimmer BP,Cordova M,Tsao J,Frigeri C

doi

10.1111/j.1749-6632.2003.tb03174.x

subject

Has Abstract

pub_date

2003-06-01 00:00:00

pages

147-53

eissn

0077-8923

issn

1749-6632

journal_volume

994

pub_type

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