20-58905490-C-T

Variant names:

• chr20-58905490-C-T
• rs199499878
• NM_080425.4:c.2459+10C>T

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_Strong BP6 BS2

The NM_080425.4(GNAS):​c.2459+10C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000193 in 1,382,730 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.00015 (0 hom., cov: 33)
  • Exomes 𝑓: 0.00020 (0 hom.)
• Consequence: GNAS NM_080425.4 intron
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1 B:2
• Conservation: PhyloP100: -2.84
• Publications: 0 publications found

Genes affected

GNAS (HGNC:4392): (GNAS complex locus) This locus has a highly complex imprinted expression pattern. It gives rise to maternally, paternally, and biallelically expressed transcripts that are derived from four alternative promoters and 5' exons. Some transcripts contain a differentially methylated region (DMR) at their 5' exons, and this DMR is commonly found in imprinted genes and correlates with transcript expression. An antisense transcript is produced from an overlapping locus on the opposite strand. One of the transcripts produced from this locus, and the antisense transcript, are paternally expressed noncoding RNAs, and may regulate imprinting in this region. In addition, one of the transcripts contains a second overlapping ORF, which encodes a structurally unrelated protein - Alex. Alternative splicing of downstream exons is also observed, which results in different forms of the stimulatory G-protein alpha subunit, a key element of the classical signal transduction pathway linking receptor-ligand interactions with the activation of adenylyl cyclase and a variety of cellular reponses. Multiple transcript variants encoding different isoforms have been found for this gene. Mutations in this gene result in pseudohypoparathyroidism type 1a, pseudohypoparathyroidism type 1b, Albright hereditary osteodystrophy, pseudopseudohypoparathyroidism, McCune-Albright syndrome, progressive osseus heteroplasia, polyostotic fibrous dysplasia of bone, and some pituitary tumors. [provided by RefSeq, Aug 2012]

GNAS Gene-Disease associations (from GenCC):

• McCune-Albright syndrome

  Inheritance: AD, Unknown Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Labcorp Genetics (formerly Invitae), Orphanet, Ambry Genetics
• progressive osseous heteroplasia

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE, NO_KNOWN Submitted by: G2P, Orphanet, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• pseudohypoparathyroidism type 1B

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, G2P, Orphanet
• pseudohypoparathyroidism type 1C

  Inheritance: AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, G2P, Orphanet
• pseudopseudohypoparathyroidism

  Inheritance: AD, Mitochondrial Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae), Orphanet
• pseudohypoparathyroidism type 1A

  Inheritance: Mitochondrial, AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Orphanet, Ambry Genetics

ACMG classification

Our verdict: Benign. The variant received -9 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.89).
• BP6: Variant 20-58905490-C-T is Benign according to our data. Variant chr20-58905490-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 435343.
• BS2: High AC in GnomAd4 at 23 AD,Mitochondrial,Unknown gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_080425.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GNAS	NM_080425.4	MANE Plus Clinical	c.2459+10C>T		intron	N/A	NP_536350.2
	GNAS	NM_000516.7	MANE Select	c.530+10C>T		intron	N/A	NP_000507.1
	GNAS	NM_016592.5	MANE Plus Clinical	c.*436+10C>T		intron	N/A	NP_057676.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GNAS	ENST00000371100.9	TSL:5 MANE Plus Clinical	c.2459+10C>T		intron	N/A	ENSP00000360141.3
	GNAS	ENST00000371085.8	TSL:1 MANE Select	c.530+10C>T		intron	N/A	ENSP00000360126.3
	GNAS	ENST00000371075.7	TSL:1 MANE Plus Clinical	c.*436+10C>T		intron	N/A	ENSP00000360115.3

Frequencies

GnomAD3 genomes AF: 0.000151 AC: 23 AN: 152056 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.000121

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000655

Gnomad ASJ AF: 0.00173

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000162

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.000163 AC: 41 AN: 251412 AF XY: 0.000184

Gnomad AFR exome AF: 0.0000615

Gnomad AMR exome AF: 0.0000578

Gnomad ASJ exome AF: 0.00238

Gnomad EAS exome AF: 0.0000544

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000105

Gnomad OTH exome AF: 0.000163

GnomAD4 exome AF: 0.000198 AC: 244 AN: 1230674 Hom.: 0 Cov.: 20 AF XY: 0.000204 AC XY: 127 AN XY: 623336

African (AFR) AF: 0.0000343 AC: 1 AN: 29170

American (AMR) AF: 0.0000450 AC: 2 AN: 44464

Ashkenazi Jewish (ASJ) AF: 0.00191 AC: 47 AN: 24670

East Asian (EAS) AF: 0.0000517 AC: 2 AN: 38694

South Asian (SAS) AF: 0.0000122 AC: 1 AN: 81896

European-Finnish (FIN) AF: 0.0000188 AC: 1 AN: 53282

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5338

European-Non Finnish (NFE) AF: 0.000195 AC: 176 AN: 900554

Other (OTH) AF: 0.000266 AC: 14 AN: 52606

GnomAD4 genome AF: 0.000151 AC: 23 AN: 152056 Hom.: 0 Cov.: 33 AF XY: 0.000108 AC XY: 8 AN XY: 74266

African (AFR) AF: 0.000121 AC: 5 AN: 41388

American (AMR) AF: 0.0000655 AC: 1 AN: 15264

Ashkenazi Jewish (ASJ) AF: 0.00173 AC: 6 AN: 3468

East Asian (EAS) AF: 0.00 AC: 0 AN: 5194

South Asian (SAS) AF: 0.00 AC: 0 AN: 4830

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10586

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.000162 AC: 11 AN: 68010

Other (OTH) AF: 0.00 AC: 0 AN: 2090

Alfa AF: 0.000428 Hom.: 0

Bravo AF: 0.000166

ClinVar

ClinVar submissions as Germline

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
-	-	1	GNAS-related disorder (1)
-	-	1	not provided (1)
-	1	-	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.89
CADD	Benign	0.044
DANN	Benign	0.87
PhyloP100		-2.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs199499878; hg19: chr20-57480545;