NM_033183.3:c.223G>A

Variant names:

• chr19-49047930-C-T
• rs1338439169
• NM_033183.3:c.223G>A

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 0P and 2B. BP4_Moderate

The NM_033183.3(CGB8):​c.223G>A​(p.Val75Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. In-silico tool predicts a benign outcome for this variant. 14/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.00012 (0 hom., cov: 24)
  • Exomes 𝑓: 0.000080 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: CGB8 NM_033183.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.117
• Publications: 0 publications found

Genes affected

CGB8 (HGNC:16453): (chorionic gonadotropin subunit beta 8) This gene is a member of the glycoprotein hormone beta chain family and encodes the beta 8 subunit of chorionic gonadotropin (CG). Glycoprotein hormones are heterodimers consisting of a common alpha subunit and an unique beta subunit which confers biological specificity. CG is produced by the trophoblastic cells of the placenta and stimulates the ovaries to synthesize the steroids that are essential for the maintenance of pregnancy. The beta subunit of CG is encoded by 6 genes which are arranged in tandem and inverted pairs on chromosome 19q13.3 and contiguous with the luteinizing hormone beta subunit gene. [provided by RefSeq, Jul 2008]

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.109559745).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_033183.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CGB8	NM_033183.3	MANE Select	c.223G>A	p.Val75Met	missense	Exon 3 of 3	NP_149439.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CGB8	ENST00000448456.4	TSL:1 MANE Select	c.223G>A	p.Val75Met	missense	Exon 3 of 3	ENSP00000403649.2	P0DN86-1
	CGB8	ENST00000933082.1		c.55G>A	p.Val19Met	missense	Exon 2 of 2	ENSP00000603141.1

Frequencies

GnomAD3 genomes AF: 0.000125 AC: 18 AN: 144444 Hom.: 0 Cov.: 24

Gnomad AFR AF: 0.0000271

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000877

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000602

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.000148 AC: 8 AN: 54016 AF XY: 0.000147

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000655

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000496

Gnomad OTH exome AF: 0.00

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 0.0000798 AC: 105 AN: 1316208 Hom.: 0 Cov.: 21 AF XY: 0.0000837 AC XY: 55 AN XY: 656744

African (AFR) AF: 0.000104 AC: 3 AN: 28924

American (AMR) AF: 0.000342 AC: 14 AN: 40956

Ashkenazi Jewish (ASJ) AF: 0.0000436 AC: 1 AN: 22918

East Asian (EAS) AF: 0.00 AC: 0 AN: 38866

South Asian (SAS) AF: 0.00 AC: 0 AN: 78402

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 37116

Middle Eastern (MID) AF: 0.000522 AC: 2 AN: 3828

European-Non Finnish (NFE) AF: 0.0000673 AC: 68 AN: 1009758

Other (OTH) AF: 0.000307 AC: 17 AN: 55440

GnomAD4 genome Data not reliable, filtered out with message: AS_VQSR AF: 0.000125 AC: 18 AN: 144444 Hom.: 0 Cov.: 24 AF XY: 0.0000854 AC XY: 6 AN XY: 70258

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.0000271 AC: 1 AN: 36866

American (AMR) AF: 0.000877 AC: 13 AN: 14816

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3404

East Asian (EAS) AF: 0.00 AC: 0 AN: 4908

South Asian (SAS) AF: 0.00 AC: 0 AN: 4516

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10280

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 304

European-Non Finnish (NFE) AF: 0.0000602 AC: 4 AN: 66468

Other (OTH) AF: 0.00 AC: 0 AN: 1978

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0.0000000022642), which strongly suggests a high chance of mosaicism in these individuals.

Alfa AF: 0.0000843 Hom.: 0

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.14
BayesDel_addAF	Benign	-0.32	T
BayesDel_noAF	Benign	-0.33
CADD	Benign	8.7
DANN	Uncertain	0.99
Eigen	Benign	-0.67
Eigen_PC	Benign	-0.84
FATHMM_MKL	Benign	0.022	N
LIST_S2	Uncertain	0.94	D
M_CAP	Benign	0.051	D
MetaRNN	Benign	0.11	T
MetaSVM	Benign	-0.44	T
PhyloP100		0.12
PrimateAI	Uncertain	0.73	T
PROVEAN	Benign	0.68	N
REVEL	Benign	0.17
Sift	Benign	0.11	T
Sift4G	Benign	0.11	T
Vest4		0.063
MutPred		0.30		Gain of catalytic residue at V75 (P = 0.0037)
MVP		0.48
MPC		0.012
ClinPred		0.062	T
GERP RS		-0.60
gMVP		0.039
Mutation Taster		=97/3	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: rs1338439169; hg19: chr19-49551187;