chr17-4716430-G-C

Position:

• chr17-4716430-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2 PP3_Moderate

The NM_004313.4(ARRB2):​c.179G>C​(p.Cys60Ser) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: ARRB2 NM_004313.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 9.56

Genes affected

ARRB2 (HGNC:712): (arrestin beta 2) Members of arrestin/beta-arrestin protein family are thought to participate in agonist-mediated desensitization of G-protein-coupled receptors and cause specific dampening of cellular responses to stimuli such as hormones, neurotransmitters, or sensory signals. Arrestin beta 2, like arrestin beta 1, was shown to inhibit beta-adrenergic receptor function in vitro. It is expressed at high levels in the central nervous system and may play a role in the regulation of synaptic receptors. Besides the brain, a cDNA for arrestin beta 2 was isolated from thyroid gland, and thus it may also be involved in hormone-specific desensitization of TSH receptors. Multiple alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Mar 2012]

ACMG classification

Verdict is Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.886

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ARRB2	NM_004313.4	c.179G>C	p.Cys60Ser	missense_variant	5/15	ENST00000269260.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ARRB2	ENST00000269260.7	c.179G>C	p.Cys60Ser	missense_variant	5/15	1	NM_004313.4	P1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 31

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

May 21, 2024

The c.179G>C (p.C60S) alteration is located in exon 5 (coding exon 5) of the ARRB2 gene. This alteration results from a G to C substitution at nucleotide position 179, causing the cysteine (C) at amino acid position 60 to be replaced by a serine (S). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.94
BayesDel_addAF	Pathogenic	0.24	D
BayesDel_noAF	Uncertain	0.11
CADD	Pathogenic	31
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.51	D;.;.;.;.
Eigen	Pathogenic	0.82
Eigen_PC	Pathogenic	0.77
FATHMM_MKL	Pathogenic	1.0	D
LIST_S2	Uncertain	0.96	D;D;D;D;D
M_CAP	Uncertain	0.14	D
MetaRNN	Pathogenic	0.89	D;D;D;D;D
MetaSVM	Uncertain	0.31	D
MutationAssessor	Pathogenic	3.2	M;.;.;M;.
MutationTaster	Benign	1.0	D;D;D;D;D;D;D;D
PrimateAI	Pathogenic	0.86	D
PROVEAN	Pathogenic	-5.4	D;D;.;.;.
REVEL	Pathogenic	0.68
Sift	Uncertain	0.019	D;D;.;.;.
Sift4G	Uncertain	0.024	D;D;D;D;D
Polyphen		0.99	D;D;.;.;.
Vest4		0.85
MutPred		0.69		Gain of sheet (P = 0.1208);.;.;Gain of sheet (P = 0.1208);Gain of sheet (P = 0.1208);
MVP		0.82
MPC		2.1
ClinPred		1.0	D
GERP RS		4.7
Varity_R		0.64
gMVP		0.83

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.070		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: rs1915035794; hg19: chr17-4619725;