chr17-4720454-C-T

Position:

• chr17-4720454-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_004313.4(ARRB2):​c.1063C>T​(p.Leu355Phe) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,306 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 30)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: ARRB2 NM_004313.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.49

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 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.124255955).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ARRB2	NM_004313.4	c.1063C>T	p.Leu355Phe	missense_variant	13/15	ENST00000269260.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ARRB2	ENST00000269260.7	c.1063C>T	p.Leu355Phe	missense_variant	13/15	1	NM_004313.4	P1

Frequencies

GnomAD3 genomes Cov.: 30

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461306 Hom.: 0 Cov.: 34 AF XY: 0.00000138 AC XY: 1 AN XY: 726908

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

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: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 30

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

Jun 02, 2023

The c.1063C>T (p.L355F) alteration is located in exon 13 (coding exon 13) of the ARRB2 gene. This alteration results from a C to T substitution at nucleotide position 1063, causing the leucine (L) at amino acid position 355 to be replaced by a phenylalanine (F). 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	Benign	0.070
BayesDel_addAF	Benign	-0.23	T
BayesDel_noAF	Benign	-0.58
CADD	Benign	16
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.43	T;T;.;T;.;.;T
Eigen	Benign	-0.49
Eigen_PC	Benign	-0.33
FATHMM_MKL	Benign	0.61	D
LIST_S2	Benign	0.82	T;.;T;.;T;T;T
M_CAP	Benign	0.049	D
MetaRNN	Benign	0.12	T;T;T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.1	L;.;.;.;.;.;.
MutationTaster	Benign	0.97	N;N;N;N;N;N;N;N
PrimateAI	Benign	0.37	T
PROVEAN	Benign	-0.95	N;.;N;.;D;.;.
REVEL	Benign	0.17
Sift	Benign	0.062	T;.;T;.;D;.;.
Sift4G	Benign	0.064	T;T;T;T;T;T;T
Polyphen		0.0010	B;.;B;.;.;.;.
Vest4		0.22
MutPred		0.19		Loss of phosphorylation at S360 (P = 0.2371);.;.;.;.;.;.;
MVP		0.57
MPC		2.0
ClinPred		0.73	D
GERP RS		4.8
Varity_R		0.11
gMVP		0.052

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

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

Publications

No publications associated with this variant yet.

Other links and lift over

hg19: chr17-4623749;