chr4-76179549-C-A

Position:

• chr4-76179549-C-A

Variant summary

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

The NM_005506.4(SCARB2):​c.580G>T​(p.Asp194Tyr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D194N) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 33)
• Consequence: SCARB2 NM_005506.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.11

Genes affected

SCARB2 (HGNC:1665): (scavenger receptor class B member 2) The protein encoded by this gene is a type III glycoprotein that is located primarily in limiting membranes of lysosomes and endosomes. Earlier studies in mice and rat suggested that this protein may participate in membrane transportation and the reorganization of endosomal/lysosomal compartment. The protein deficiency in mice was reported to impair cell membrane transport processes and cause pelvic junction obstruction, deafness, and peripheral neuropathy. Further studies in human showed that this protein is a ubiquitously expressed protein and that it is involved in the pathogenesis of HFMD (hand, foot, and mouth disease) caused by enterovirus-71 and possibly by coxsackievirus A16. Mutations in this gene caused an autosomal recessive progressive myoclonic epilepsy-4 (EPM4), also known as action myoclonus-renal failure syndrome (AMRF). Alternatively spliced transcript variants encoding different isoforms have been found for this gene.[provided by RefSeq, Feb 2011]

(HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SCARB2	NM_005506.4	c.580G>T	p.Asp194Tyr	missense_variant	4/12	ENST00000264896.8
SCARB2	XM_047416429.1	c.106G>T	p.Asp36Tyr	missense_variant	4/12
SCARB2	XM_047416430.1	c.106G>T	p.Asp36Tyr	missense_variant	4/12
SCARB2	NM_001204255.2	c.276-3639G>T		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SCARB2	ENST00000264896.8	c.580G>T	p.Asp194Tyr	missense_variant	4/12	1	NM_005506.4	P4
	ENST00000651366.1	n.103-20417C>A		intron_variant, non_coding_transcript_variant

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.19
BayesDel_addAF	Uncertain	0.036	T
BayesDel_noAF	Benign	-0.19
CADD	Benign	20
DANN	Uncertain	0.98
DEOGEN2	Uncertain	0.50	T;.;.;.;.;.
Eigen	Uncertain	0.30
Eigen_PC	Benign	0.15
FATHMM_MKL	Uncertain	0.77	D
LIST_S2	Uncertain	0.89	D;D;D;D;D;D
M_CAP	Benign	0.080	D
MetaRNN	Uncertain	0.45	T;T;T;T;T;T
MetaSVM	Uncertain	-0.030	T
MutationAssessor	Uncertain	2.9	M;.;.;.;.;.
MutationTaster	Benign	1.0	D;N
PrimateAI	Benign	0.35	T
PROVEAN	Uncertain	-4.1	D;.;.;.;.;.
REVEL	Uncertain	0.39
Sift	Uncertain	0.012	D;.;.;.;.;.
Sift4G	Uncertain	0.0080	D;.;.;.;.;.
Polyphen		0.98	D;.;.;.;.;.
Vest4		0.35
MutPred		0.46		Loss of solvent accessibility (P = 0.0052);.;Loss of solvent accessibility (P = 0.0052);Loss of solvent accessibility (P = 0.0052);.;Loss of solvent accessibility (P = 0.0052);
MVP		0.76
MPC		0.90
ClinPred		0.90	D
GERP RS		5.6
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.59
gMVP		0.81

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

LitVar

Other links and lift over

dbSNP: rs773017713; hg19: chr4-77100702;