chr20-58851394-G-T

Variant names:

• chr20-58851394-G-T
• rs6100252
• NM_016592.5:c.*42+10508G>T

Variant summary

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

The NM_016592.5(GNAS):​c.*42+10508G>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.228 in 152,016 control chromosomes in the GnomAD database, including 4,661 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 0.23 (4661 hom., cov: 32)
• Consequence: GNAS NM_016592.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.455
• 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-AS1 (HGNC:24872): (GNAS antisense RNA 1) This gene produces a paternally-imprinted antisense RNA transcript that helps regulate the GNAS complex locus, which encodes the alpha subunit of the stimulatory G protein. Defects in this gene are a cause of pseudohypoparathyroidism type Ib.[provided by RefSeq, Jun 2010]

GNAS-AS1 Gene-Disease associations (from GenCC):

• pseudohypoparathyroidism type 1B

  Inheritance: Unknown Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)

ENSG00000293655 (HGNC:):

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.88).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.364 is higher than 0.05.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_016592.5. 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_016592.5	MANE Plus Clinical	c.*42+10508G>T		intron	N/A	NP_057676.1
	GNAS	NM_001410912.1		c.43+10508G>T		intron	N/A	NP_001397841.1
	GNAS	NM_001309861.2		c.-39+9519G>T		intron	N/A	NP_001296790.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	GNAS	ENST00000371075.7	TSL:1 MANE Plus Clinical	c.*42+10508G>T		intron	N/A	ENSP00000360115.3
	GNAS	ENST00000663479.2		c.-39+9519G>T		intron	N/A	ENSP00000499353.2
	GNAS	ENST00000462499.6	TSL:2	c.-39+9519G>T		intron	N/A	ENSP00000499758.2

Frequencies

GnomAD3 genomes AF: 0.228 AC: 34610 AN: 151898 Hom.: 4652 Cov.: 32

Gnomad AFR AF: 0.369

Gnomad AMI AF: 0.124

Gnomad AMR AF: 0.178

Gnomad ASJ AF: 0.277

Gnomad EAS AF: 0.00232

Gnomad SAS AF: 0.0920

Gnomad FIN AF: 0.102

Gnomad MID AF: 0.253

Gnomad NFE AF: 0.198

Gnomad OTH AF: 0.234

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

GnomAD4 genome AF: 0.228 AC: 34633 AN: 152016 Hom.: 4661 Cov.: 32 AF XY: 0.218 AC XY: 16208 AN XY: 74326

African (AFR) AF: 0.369 AC: 15261 AN: 41394

American (AMR) AF: 0.178 AC: 2719 AN: 15284

Ashkenazi Jewish (ASJ) AF: 0.277 AC: 959 AN: 3464

East Asian (EAS) AF: 0.00233 AC: 12 AN: 5160

South Asian (SAS) AF: 0.0908 AC: 438 AN: 4824

European-Finnish (FIN) AF: 0.102 AC: 1084 AN: 10608

Middle Eastern (MID) AF: 0.255 AC: 75 AN: 294

European-Non Finnish (NFE) AF: 0.198 AC: 13483 AN: 67962

Other (OTH) AF: 0.231 AC: 489 AN: 2114

Alfa AF: 0.229 Hom.: 1382

Bravo AF: 0.240

Asia WGS AF: 0.0690 AC: 244 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.88
CADD	Benign	2.0
DANN	Benign	0.75
PhyloP100		-0.46
Mutation Taster		=100/0	polymorphism (auto)

Splicing

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

Other links and lift over

dbSNP: rs6100252; hg19: chr20-57426449; COSMIC: COSV58345622; COSMIC: COSV58345622;