Genetic Variant CGB8:c.15+139T>G (chr19-49048586-A-C) – ACMG Classification: Benign (-8 pts)

Variant summary

Our verdict is Benign. The variant received -8 ACMG points: 0P and 8B. BP4_StrongBS2

The NM_033183.3(CGB8):c.15+139T>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00132 in 1,596,764 control chromosomes in the GnomAD database, including 25 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: 𝑓 0.0080 ( 11 hom., cov: 32)

Exomes 𝑓: 0.00063 ( 14 hom. )

Consequence

CGB8
NM_033183.3 intron

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -1.63

Publications

1 publications found

Variant links:

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]

CGB8 links:

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ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -8 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.99).

BS2

High Homozygotes in GnomAd4 at 11 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CGB8	NM_033183.3 link	c.15+139T>G		intron_variant	Intron 1 of 2	ENST00000448456.4	NP_149439.1	P0DN86-1A0A0F7RQP8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CGB8	ENST00000448456.4 link	c.15+139T>G		intron_variant	Intron 1 of 2	1	NM_033183.3	ENSP00000403649.2		P0DN86-1

Frequencies

GnomAD3 genomes

AF:

0.00796

AC:

1189

AN:

149336

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0285

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00316

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000416

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000324

Gnomad OTH

AF:

0.00436

GnomAD4 exome

AF:

0.000631

AC:

913

AN:

1447320

Hom.:

AF XY:

0.000549

AC XY:

395

AN XY:

719014

show subpopulations

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

African (AFR)

AF:

0.0176

AC:

548

AN:

31136

American (AMR)

AF:

0.00137

AC:

AN:

43954

Ashkenazi Jewish (ASJ)

AF:

0.0000395

AC:

AN:

25334

East Asian (EAS)

AF:

0.000354

AC:

AN:

39550

South Asian (SAS)

AF:

0.000283

AC:

AN:

84824

European-Finnish (FIN)

AF:

0.0000567

AC:

AN:

52928

Middle Eastern (MID)

AF:

0.00120

AC:

AN:

4178

European-Non Finnish (NFE)

AF:

0.000165

AC:

182

AN:

1105966

Other (OTH)

AF:

0.00128

AC:

AN:

59450

⚠️ 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.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.383

Heterozygous variant carriers

104

138

173

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

100

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.00796

AC:

1190

AN:

149444

Hom.:

Cov.:

AF XY:

0.00777

AC XY:

568

AN XY:

73108

show subpopulations

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

African (AFR)

AF:

0.0284

AC:

1109

AN:

39054

American (AMR)

AF:

0.00316

AC:

AN:

15194

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3462

East Asian (EAS)

AF:

0.00

AC:

AN:

5182

South Asian (SAS)

AF:

0.000417

AC:

AN:

4798

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10608

Middle Eastern (MID)

AF:

0.00

AC:

AN:

284

European-Non Finnish (NFE)

AF:

0.000324

AC:

AN:

67864

Other (OTH)

AF:

0.00431

AC:

AN:

2086

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.361

Heterozygous variant carriers

110

165

220

275

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

100

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00

Hom.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.99

CADD

Benign

1.1

(source)

DANN

Benign

0.47

PhyloP100

-1.6

Mutation Taster

=100/0

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.070

Details are displayed if max score is > 0.2

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over