rs338489

chr1-108901820-A-G

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BA1

The NM_013296.5(GPSM2):c.828A>G(p.Lys276=) variant causes a synonymous change. The variant allele was found at a frequency of 0.00515 in 1,612,284 control chromosomes in the GnomAD database, including 316 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.025 (166 hom., cov: 31)
  • Exomes 𝑓: 0.0030 (150 hom.)
• Consequence: GPSM2 NM_013296.5 synonymous
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:7
• Conservation: PhyloP100: 4.38

Genes affected

GPSM2 (HGNC:29501): (G protein signaling modulator 2) The protein encoded by this gene belongs to a family of proteins that modulate activation of G proteins, which transduce extracellular signals received by cell surface receptors into integrated cellular responses. The N-terminal half of this protein contains 10 copies of leu-gly-asn (LGN) repeat, and the C-terminal half contains 4 GoLoco motifs, which are involved in guanine nucleotide exchange. This protein may play a role in neuroblast division and in the development of normal hearing. Mutations in this gene are associated with autosomal recessive nonsyndromic deafness (DFNB82). Alternative splicing results in multiple transcript variants. [provided by RefSeq, Mar 2016]

AKNAD1 (HGNC:28398): (AKNA domain containing 1) This gene encodes a protein which contains a domain found in an AT-hook-containing transcription factor. Alternative splicing results in multiple transcript variants. [provided by RefSeq, May 2012]

CLCC1 (HGNC:29675): (chloride channel CLIC like 1) Predicted to enable chloride channel activity. Predicted to be involved in chloride transport. Located in endoplasmic reticulum and mitochondria-associated endoplasmic reticulum membrane. Implicated in retinitis pigmentosa 32. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.49).
• BP6: Variant 1-108901820-A-G is Benign according to our data. Variant chr1-108901820-A-G is described in ClinVar as [Likely_benign]. Clinvar id is 45571.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.0838 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GPSM2	NM_013296.5	c.828A>G	p.Lys276=	synonymous_variant	8/15	ENST00000264126.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GPSM2	ENST00000264126.9	c.828A>G	p.Lys276=	synonymous_variant	8/15	1	NM_013296.5	P1

Frequencies

GnomAD3 genomes AF: 0.0253 AC: 3846 AN: 152156 Hom.: 165 Cov.: 31

Gnomad AFR AF: 0.0862

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0105

Gnomad ASJ AF: 0.00519

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.0222

Gnomad NFE AF: 0.000838

Gnomad OTH AF: 0.0153

GnomAD3 exomes AF: 0.00744 AC: 1870 AN: 251386 Hom.: 66 AF XY: 0.00536 AC XY: 728 AN XY: 135866

Gnomad AFR exome AF: 0.0921

Gnomad AMR exome AF: 0.00529

Gnomad ASJ exome AF: 0.00724

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000163

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000730

Gnomad OTH exome AF: 0.00473

GnomAD4 exome AF: 0.00304 AC: 4444 AN: 1460010 Hom.: 150 Cov.: 29 AF XY: 0.00271 AC XY: 1968 AN XY: 726520

Gnomad4 AFR exome AF: 0.0900

Gnomad4 AMR exome AF: 0.00590

Gnomad4 ASJ exome AF: 0.00586

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000232

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000440

Gnomad4 OTH exome AF: 0.00767

GnomAD4 genome AF: 0.0253 AC: 3854 AN: 152274 Hom.: 166 Cov.: 31 AF XY: 0.0249 AC XY: 1854 AN XY: 74460

Gnomad4 AFR AF: 0.0862

Gnomad4 AMR AF: 0.0105

Gnomad4 ASJ AF: 0.00519

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000838

Gnomad4 OTH AF: 0.0151

Alfa AF: 0.00729 Hom.: 49

Bravo AF: 0.0284

Asia WGS AF: 0.00606 AC: 22 AN: 3478

EpiCase AF: 0.00125

EpiControl AF: 0.00101

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:7

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:3

Benign, criteria provided, single submitter	clinical testing	GeneDx	Mar 22, 2016	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -
Benign, criteria provided, single submitter	clinical testing	Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine	May 07, 2012	Lys276Lys in Exon 08 of GPSM2: This variant is not expected to have clinical si gnificance because it does not alter an amino acid residue, is not located withi n the splice consensus sequence, and has been identified in 8.6% (320/3738) of A frican American chromosomes from a broad population by the NHLBI Exome Sequencin g Project (http://evs.gs.washington.edu/EVS; dbSNP rs338489). -
Benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	-	- -

Chudley-McCullough syndrome Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 13, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as likely benign is not then subjected to further curation. The score for this variant resulted in a classification of likely benign for this disease. -
Benign, criteria provided, single submitter	clinical testing	ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories	Sep 22, 2023	- -

not provided Benign:2

Benign, criteria provided, single submitter	clinical testing	Invitae	Jan 29, 2024	- -
Benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	Jun 06, 2019	- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.49
Cadd	Benign	8.7
Dann	Benign	0.72

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

Publications

LitVar

Other links and lift over

dbSNP: rs338489; hg19: chr1-109444442;