2-43837951-G-C

Variant names:

• chr2-43837951-G-C
• rs6756629
• NM_022436.3:c.148C>G

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2 BP4

The NM_022436.3(ABCG5):​c.148C>G​(p.Arg50Gly) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 13/22 in silico tools predict a benign outcome for this variant. 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. R50C) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: ABCG5 NM_022436.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 5.29
• Publications: 111 publications found

Genes affected

ABCG5 (HGNC:13886): (ATP binding cassette subfamily G member 5) The protein encoded by this gene is a member of the superfamily of ATP-binding cassette (ABC) transporters. ABC proteins transport various molecules across extra- and intra-cellular membranes. ABC genes are divided into seven distinct subfamilies (ABC1, MDR/TAP, MRP, ALD, OABP, GCN20, White). This protein is a member of the White subfamily. The protein encoded by this gene functions as a half-transporter to limit intestinal absorption and promote biliary excretion of sterols. It is expressed in a tissue-specific manner in the liver, colon, and intestine. This gene is tandemly arrayed on chromosome 2, in a head-to-head orientation with family member ABCG8. Mutations in this gene may contribute to sterol accumulation and atheroschlerosis, and have been observed in patients with sitosterolemia. [provided by RefSeq, Jul 2008]

ABCG8 (HGNC:13887): (ATP binding cassette subfamily G member 8) The protein encoded by this gene is a member of the superfamily of ATP-binding cassette (ABC) transporters. ABC proteins transport various molecules across extra- and intra-cellular membranes. ABC genes are divided into seven distinct subfamilies (ABC1, MDR/TAP, MRP, ALD, OABP, GCN20, White). This protein is a member of the White subfamily. The protein encoded by this gene functions to exclude non-cholesterol sterol entry at the intestinal level, promote excretion of cholesterol and sterols into bile, and to facilitate transport of sterols back into the intestinal lumen. It is expressed in a tissue-specific manner in the liver, intestine, and gallbladder. This gene is tandemly arrayed on chromosome 2, in a head-to-head orientation with family member ABCG5. Mutations in this gene may contribute to sterol accumulation and atherosclerosis, and have been observed in patients with sitosterolemia. [provided by RefSeq, Jul 2008]

ABCG8 Gene-Disease associations (from GenCC):

• sitosterolemia

  Inheritance: AR Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet, Illumina
• sitosterolemia 1

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), G2P

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.34661603).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_022436.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ABCG5	NM_022436.3	MANE Select	c.148C>G	p.Arg50Gly	missense	Exon 2 of 13	NP_071881.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ABCG5	ENST00000405322.8	TSL:1 MANE Select	c.148C>G	p.Arg50Gly	missense	Exon 2 of 13	ENSP00000384513.2
	ABCG5	ENST00000486512.5	TSL:1	n.800C>G		non_coding_transcript_exon	Exon 1 of 9
	ABCG5	ENST00000409962.1	TSL:2	n.915C>G		non_coding_transcript_exon	Exon 1 of 9

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.10
BayesDel_addAF	Uncertain	0.067	T
BayesDel_noAF	Benign	-0.14
CADD	Benign	19
DANN	Benign	0.97
DEOGEN2	Benign	0.31	T
Eigen	Benign	-0.30
Eigen_PC	Benign	-0.31
FATHMM_MKL	Uncertain	0.88	D
LIST_S2	Benign	0.83	T
M_CAP	Benign	0.071	D
MetaRNN	Benign	0.35	T
MetaSVM	Uncertain	0.11	D
MutationAssessor	Benign	1.8	L
PhyloP100		5.3
PrimateAI	Benign	0.19	T
PROVEAN	Benign	-2.1	N
REVEL	Uncertain	0.29
Sift	Benign	0.068	T
Sift4G	Uncertain	0.0060	D
Polyphen		0.59	P
Vest4		0.47
MutPred		0.41		Loss of MoRF binding (P = 0.0367)
MVP		0.83
MPC		0.15
ClinPred		0.59	D
GERP RS		3.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0
Varity_R		0.17
gMVP		0.71
Mutation Taster		=91/9	polymorphism

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

Other links and lift over

dbSNP: rs6756629; hg19: chr2-44065090;