NM_033183.3:c.434C>T

Variant names:

• chr19-49047719-G-A
• rs1348219257
• NM_033183.3:c.434C>T

Variant summary

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

The NM_033183.3(CGB8):​c.434C>T​(p.Pro145Leu) 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 (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P145H) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.0 (0 hom., cov: 24)
  • Exomes 𝑓: 0.0000069 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: CGB8 NM_033183.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.79
• 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=0.14797297).

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.434C>T	p.Pro145Leu	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.434C>T	p.Pro145Leu	missense	Exon 3 of 3	ENSP00000403649.2	P0DN86-1
	CGB8	ENST00000933082.1		c.266C>T	p.Pro89Leu	missense	Exon 2 of 2	ENSP00000603141.1

Frequencies

GnomAD3 genomes AF: 0.00 AC: 0 AN: 151292 Hom.: 0 Cov.: 24

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

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: 0.00

Gnomad OTH AF: 0.00

GnomAD2 exomes AF: 0.0000430 AC: 3 AN: 69808 AF XY: 0.0000866

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000118

Gnomad OTH exome AF: 0.00

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 0.00000687 AC: 10 AN: 1456324 Hom.: 0 Cov.: 38 AF XY: 0.0000124 AC XY: 9 AN XY: 724218

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

African (AFR) AF: 0.00 AC: 0 AN: 33194

American (AMR) AF: 0.00 AC: 0 AN: 44572

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25846

East Asian (EAS) AF: 0.00 AC: 0 AN: 39666

South Asian (SAS) AF: 0.00 AC: 0 AN: 85768

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53176

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4116

European-Non Finnish (NFE) AF: 0.00000901 AC: 10 AN: 1109950

Other (OTH) AF: 0.00 AC: 0 AN: 60036

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

GnomAD4 genome Data not reliable, filtered out with message: AC0;AS_VQSR AF: 0.00 AC: 0 AN: 151292 Hom.: 0 Cov.: 24 AF XY: 0.00 AC XY: 0 AN XY: 73856

African (AFR) AF: 0.00 AC: 0 AN: 40784

American (AMR) AF: 0.00 AC: 0 AN: 15246

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5146

South Asian (SAS) AF: 0.00 AC: 0 AN: 4792

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10588

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 67966

Other (OTH) AF: 0.00 AC: 0 AN: 2074

Alfa AF: 0.00 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	0.080
BayesDel_addAF	Benign	-0.28	T
BayesDel_noAF	Benign	-0.40
CADD	Benign	19
DANN	Uncertain	0.98
Eigen	Benign	-0.62
Eigen_PC	Benign	-0.84
FATHMM_MKL	Benign	0.070	N
LIST_S2	Uncertain	0.87	D
M_CAP	Benign	0.0018	T
MetaRNN	Benign	0.15	T
MetaSVM	Benign	-0.91	T
PhyloP100		1.8
PrimateAI	Benign	0.45	T
PROVEAN	Benign	-0.71	N
REVEL	Benign	0.12
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Vest4		0.22
MutPred		0.16		Loss of glycosylation at P145 (P = 0.0016)
MVP		0.35
MPC		0.020
ClinPred		0.22	T
GERP RS		-2.9
gMVP		0.037
Mutation Taster		=100/0	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: rs1348219257; hg19: chr19-49550976;