chr20-58906093-A-G

Variant names:

• chr20-58906093-A-G
• rs3787493
• NM_080425.4:c.2459+613A>G

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_080425.4(GNAS):​c.2459+613A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.605 in 152,104 control chromosomes in the GnomAD database, including 30,303 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.60 (30303 hom., cov: 32)
• Consequence: GNAS NM_080425.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.166
• Publications: 6 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 -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.79).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.876 is higher than 0.05.

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+613A>G		intron	N/A	NP_536350.2
	GNAS	NM_000516.7	MANE Select	c.530+613A>G		intron	N/A	NP_000507.1
	GNAS	NM_016592.5	MANE Plus Clinical	c.*436+613A>G		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+613A>G		intron	N/A	ENSP00000360141.3
	GNAS	ENST00000371085.8	TSL:1 MANE Select	c.530+613A>G		intron	N/A	ENSP00000360126.3
	GNAS	ENST00000371075.7	TSL:1 MANE Plus Clinical	c.*436+613A>G		intron	N/A	ENSP00000360115.3

Frequencies

GnomAD3 genomes AF: 0.604 AC: 91861 AN: 151986 Hom.: 30250 Cov.: 32

Gnomad AFR AF: 0.883

Gnomad AMI AF: 0.367

Gnomad AMR AF: 0.533

Gnomad ASJ AF: 0.599

Gnomad EAS AF: 0.350

Gnomad SAS AF: 0.401

Gnomad FIN AF: 0.408

Gnomad MID AF: 0.506

Gnomad NFE AF: 0.519

Gnomad OTH AF: 0.588

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.605 AC: 91965 AN: 152104 Hom.: 30303 Cov.: 32 AF XY: 0.594 AC XY: 44143 AN XY: 74354

African (AFR) AF: 0.883 AC: 36668 AN: 41508

American (AMR) AF: 0.533 AC: 8136 AN: 15272

Ashkenazi Jewish (ASJ) AF: 0.599 AC: 2077 AN: 3468

East Asian (EAS) AF: 0.349 AC: 1809 AN: 5182

South Asian (SAS) AF: 0.402 AC: 1936 AN: 4820

European-Finnish (FIN) AF: 0.408 AC: 4305 AN: 10554

Middle Eastern (MID) AF: 0.510 AC: 150 AN: 294

European-Non Finnish (NFE) AF: 0.519 AC: 35316 AN: 67984

Other (OTH) AF: 0.584 AC: 1234 AN: 2112

Alfa AF: 0.547 Hom.: 9796

Bravo AF: 0.623

Asia WGS AF: 0.410 AC: 1425 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.79
CADD	Benign	9.0
DANN	Benign	0.75
PhyloP100		-0.17
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Mutation Taster		=100/0	polymorphism (auto)

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		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: rs3787493; hg19: chr20-57481148;