chr20-58840312-A-T

Position:

chr20-58840312-A-T

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 2P and 7B. PM2BP4_ModerateBP6BS1

The NM_016592.5(GNAS):c.206A>T(p.His69Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000335 in 1,612,118 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 11/15 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. H69N) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000079 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000029 ( 0 hom. )

Consequence

GNAS
NM_016592.5 missense

Scores

Clinical Significance

Likely benign no assertion criteria provided B:1

Conservation

PhyloP100: 2.43

Variant links:

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 links:

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 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -5 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.18316448).

BP6

Variant 20-58840312-A-T is Benign according to our data. Variant chr20-58840312-A-T is described in ClinVar as [Likely_benign]. Clinvar id is 3035607.Status of the report is no_assertion_criteria_provided, 0 stars.

BS1

Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.0000792 (12/151572) while in subpopulation AMR AF= 0.000722 (11/15238). AF 95% confidence interval is 0.000404. There are 0 homozygotes in gnomad4. There are 10 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GNAS	NM_016592.5 linkuse as main transcript	c.206A>T	p.His69Leu	missense_variant	1/13	ENST00000371075.7
GNAS-AS1	NR_002785.2 linkuse as main transcript	n.819+1625T>A		intron_variant, non_coding_transcript_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GNAS	ENST00000371075.7 linkuse as main transcript	c.206A>T	p.His69Leu	missense_variant	1/13	1	NM_016592.5		O95467-1
GNAS-AS1	ENST00000424094.6 linkuse as main transcript	n.819+1625T>A		intron_variant, non_coding_transcript_variant		1

Frequencies

GnomAD3 genomes

AF:

0.0000792

AC:

AN:

151572

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000722

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000174

AC:

AN:

247236

Hom.:

AF XY:

0.000126

AC XY:

AN XY:

134590

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00116

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.000494

GnomAD4 exome

AF:

0.0000288

AC:

AN:

1460546

Hom.:

Cov.:

AF XY:

0.0000220

AC XY:

AN XY:

726620

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.000894

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.0000331

GnomAD4 genome

AF:

0.0000792

AC:

AN:

151572

Hom.:

Cov.:

AF XY:

0.000135

AC XY:

AN XY:

74004

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.000722

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000712

Hom.:

Bravo

AF:

0.0000529

ExAC

AF:

0.000124

AC:

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: no assertion criteria provided

LINK: link

Submissions by phenotype

GNAS-related disorder

Benign:1

Likely benign, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

Jun 22, 2022

This variant is classified as likely benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_addAF

Benign

-0.25

BayesDel_noAF

Benign

-0.18

CADD

Uncertain

DANN

Benign

0.93

DEOGEN2

Uncertain

0.55

D;D;D

Eigen

Benign

0.14

Eigen_PC

Benign

0.14

FATHMM_MKL

Benign

0.68

LIST_S2

Benign

0.58

.;.;T

M_CAP

Benign

0.0052

MetaRNN

Benign

0.18

T;T;T

MetaSVM

Benign

-0.97

MutationAssessor

Benign

1.0

L;L;L

MutationTaster

Benign

1.0

N;N;N

PrimateAI

Uncertain

0.75

PROVEAN

Benign

-1.9

N;N;N

REVEL

Benign

0.22

Sift

Uncertain

0.017

D;D;D

Sift4G

Uncertain

0.012

D;D;D

Polyphen

0.90

P;P;P

Vest4

0.62

MutPred

0.70

Gain of relative solvent accessibility (P = 0.09);Gain of relative solvent accessibility (P = 0.09);Gain of relative solvent accessibility (P = 0.09);

MVP

0.19

ClinPred

0.15

GERP RS

2.8

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.2

Splicing

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

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over