Imprinting of the G(s)alpha gene GNAS1 in the pathogenesis of acromegaly.
Approximately 40% of growth hormone-secreting pituitary adenomas have somatic mutations in the GNAS1 gene (the so-called gsp oncogene). These mutations at codon 201 or codon 227 constitutively activate the alpha subunit of the adenylate cyclase-stimulating G protein G(s). GNAS1 is subject to a compl...
| Main Authors: | , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
2001
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| _version_ | 1797098084773134336 |
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| author | Hayward, B Barlier, A Korbonits, M Grossman, AB Jacquet, P Enjalbert, A Bonthron, D |
| author_facet | Hayward, B Barlier, A Korbonits, M Grossman, AB Jacquet, P Enjalbert, A Bonthron, D |
| author_sort | Hayward, B |
| collection | OXFORD |
| description | Approximately 40% of growth hormone-secreting pituitary adenomas have somatic mutations in the GNAS1 gene (the so-called gsp oncogene). These mutations at codon 201 or codon 227 constitutively activate the alpha subunit of the adenylate cyclase-stimulating G protein G(s). GNAS1 is subject to a complex pattern of genomic imprinting, its various promoters directing the production of maternally, paternally, and biallelically derived gene products. Transcripts encoding G(s)alpha are biallelically derived in most human tissues. Despite this, we show here that in 21 out of 22 gsp-positive somatotroph adenomas, the mutation had occurred on the maternal allele. To investigate the reason for this allelic bias, we also analyzed GNAS1 imprinting in the normal adult pituitary and found that G(s)alpha is monoallelically expressed from the maternal allele in this tissue. We further show that this monoallelic expression of G(s)alpha is frequently relaxed in somatotroph tumors, both in those that have gsp mutations and in those that do not. These findings imply a possible role for loss of G(s)alpha imprinting during pituitary somatotroph tumorigenesis and also suggest that G(s)alpha imprinting is regulated separately from that of the other GNAS1 products, NESP55 and XLalphas, imprinting of which is retained in these tumors. |
| first_indexed | 2024-03-07T05:04:36Z |
| format | Journal article |
| id | oxford-uuid:d979fe76-317e-4e10-840e-eca8ce7e8db8 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T05:04:36Z |
| publishDate | 2001 |
| record_format | dspace |
| spelling | oxford-uuid:d979fe76-317e-4e10-840e-eca8ce7e8db82022-03-27T08:56:13ZImprinting of the G(s)alpha gene GNAS1 in the pathogenesis of acromegaly.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:d979fe76-317e-4e10-840e-eca8ce7e8db8EnglishSymplectic Elements at Oxford2001Hayward, BBarlier, AKorbonits, MGrossman, ABJacquet, PEnjalbert, ABonthron, DApproximately 40% of growth hormone-secreting pituitary adenomas have somatic mutations in the GNAS1 gene (the so-called gsp oncogene). These mutations at codon 201 or codon 227 constitutively activate the alpha subunit of the adenylate cyclase-stimulating G protein G(s). GNAS1 is subject to a complex pattern of genomic imprinting, its various promoters directing the production of maternally, paternally, and biallelically derived gene products. Transcripts encoding G(s)alpha are biallelically derived in most human tissues. Despite this, we show here that in 21 out of 22 gsp-positive somatotroph adenomas, the mutation had occurred on the maternal allele. To investigate the reason for this allelic bias, we also analyzed GNAS1 imprinting in the normal adult pituitary and found that G(s)alpha is monoallelically expressed from the maternal allele in this tissue. We further show that this monoallelic expression of G(s)alpha is frequently relaxed in somatotroph tumors, both in those that have gsp mutations and in those that do not. These findings imply a possible role for loss of G(s)alpha imprinting during pituitary somatotroph tumorigenesis and also suggest that G(s)alpha imprinting is regulated separately from that of the other GNAS1 products, NESP55 and XLalphas, imprinting of which is retained in these tumors. |
| spellingShingle | Hayward, B Barlier, A Korbonits, M Grossman, AB Jacquet, P Enjalbert, A Bonthron, D Imprinting of the G(s)alpha gene GNAS1 in the pathogenesis of acromegaly. |
| title | Imprinting of the G(s)alpha gene GNAS1 in the pathogenesis of acromegaly. |
| title_full | Imprinting of the G(s)alpha gene GNAS1 in the pathogenesis of acromegaly. |
| title_fullStr | Imprinting of the G(s)alpha gene GNAS1 in the pathogenesis of acromegaly. |
| title_full_unstemmed | Imprinting of the G(s)alpha gene GNAS1 in the pathogenesis of acromegaly. |
| title_short | Imprinting of the G(s)alpha gene GNAS1 in the pathogenesis of acromegaly. |
| title_sort | imprinting of the g s alpha gene gnas1 in the pathogenesis of acromegaly |
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