rs281864801

Variant names:

• chr17-68527823-GTTATTT-G
• rs281864801
• NM_002734.5:c.709-7_709-2delTTTTTA

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1_Moderate PM2 PP5_Very_Strong

The NM_002734.5(PRKAR1A):​c.709-7_709-2delTTTTTA variant causes a splice acceptor, splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000208 in 1,442,274 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: PRKAR1A NM_002734.5 splice_acceptor, splice_region, intron
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:5 O:1
• Conservation: PhyloP100: 2.54

Genes affected

PRKAR1A (HGNC:9388): (protein kinase cAMP-dependent type I regulatory subunit alpha) cAMP is a signaling molecule important for a variety of cellular functions. cAMP exerts its effects by activating the cAMP-dependent protein kinase, which transduces the signal through phosphorylation of different target proteins. The inactive kinase holoenzyme is a tetramer composed of two regulatory and two catalytic subunits. cAMP causes the dissociation of the inactive holoenzyme into a dimer of regulatory subunits bound to four cAMP and two free monomeric catalytic subunits. Four different regulatory subunits and three catalytic subunits have been identified in humans. This gene encodes one of the regulatory subunits. This protein was found to be a tissue-specific extinguisher that down-regulates the expression of seven liver genes in hepatoma x fibroblast hybrids. Mutations in this gene cause Carney complex (CNC). This gene can fuse to the RET protooncogene by gene rearrangement and form the thyroid tumor-specific chimeric oncogene known as PTC2. A nonconventional nuclear localization sequence (NLS) has been found for this protein which suggests a role in DNA replication via the protein serving as a nuclear transport protein for the second subunit of the Replication Factor C (RFC40). Several alternatively spliced transcript variants encoding two different isoforms have been observed. [provided by RefSeq, Jan 2013]

ACMG classification

Verdict is Pathogenic. Variant got 12 ACMG points.

• PVS1: Splicing +-2 bp (donor or acceptor) variant, product NOT destroyed by NMD, known LOF gene, truncates exone, which is 0.05322862 fraction of the gene. Cryptic splice site detected, with MaxEntScore 10, offset of 0 (no position change), new splice context is: atcacttttgttatttttAGgga. Cryptic site results in inframe change. If cryptic site found is not functional and variant results in exon loss, it results in frameshift change.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 17-68527823-GTTATTT-G is Pathogenic according to our data. Variant chr17-68527823-GTTATTT-G is described in ClinVar as [Pathogenic]. Clinvar id is 12675.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PRKAR1A	NM_002734.5	c.709-7_709-2delTTTTTA		splice_acceptor_variant, splice_region_variant, intron_variant	Intron 7 of 10	ENST00000589228.6	NP_002725.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PRKAR1A	ENST00000589228.6	c.709-7_709-2delTTTTTA		splice_acceptor_variant, splice_region_variant, intron_variant	Intron 7 of 10	1	NM_002734.5	ENSP00000464977.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000208 AC: 3 AN: 1442274 Hom.: 0 AF XY: 0.00000278 AC XY: 2 AN XY: 718760

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000253

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000183

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:5 Other:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Carney complex, type 1 Pathogenic:2 Other:1

Dec 13, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

For these reasons, this variant has been classified as Pathogenic. Studies have shown that this variant results in skipping of exon 8 (also called exon 7) and introduces a premature termination codon (PMID: 16464939). The resulting mRNA is expected to undergo nonsense-mediated decay. This variant is also known as exon 7 IVS del (-7_-2). This variant has been observed in individuals with clinical features of Carney complex, mostly presenting with primary pigmented nodular adrenocortical disease (PPNAD) (PMID: 16464939, 24859511, 29909407). It has also been observed to segregate with disease in related individuals. This variant is not present in population databases (gnomAD no frequency). This sequence change falls in intron 7 of the PRKAR1A gene. It does not directly change the encoded amino acid sequence of the PRKAR1A protein. RNA analysis indicates that this variant induces altered splicing and may result in an absent or disrupted protein product. -

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GeneReviews

Significance: not provided

Review Status: no classification provided

Collection Method: literature only

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Department of Pathology and Laboratory Medicine, Sinai Health System

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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Pigmented nodular adrenocortical disease, primary, 1 Pathogenic:1

May 01, 2006

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

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Pigmented nodular adrenocortical disease, primary, 1;C2607929:Carney complex, type 1;C2931787:Familial atrial myxoma;C3276228:Acrodysostosis 1 with or without hormone resistance Pathogenic:1

Oct 26, 2021

Fulgent Genetics, Fulgent Genetics

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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CARNEY COMPLEX, TYPE I Pathogenic:1

May 01, 2006

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

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Computational scores

Source: dbNSFP v4.3

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs281864801; hg19: chr17-66523964;