Genetic Variant CGB1:c.-134C>G (chr19-49036845-G-C) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_033377.2(CGB1):c.-134C>G variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000177 in 1,127,942 control chromosomes in the GnomAD database, with no homozygous occurrence. 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: not found (cov: 31)

Exomes 𝑓: 0.0000018 ( 0 hom. )

Consequence

CGB1
NM_033377.2 5_prime_UTR

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 0.648

Publications

0 publications found

Variant links:

Genes affected

CGB1 (HGNC:16721): (chorionic gonadotropin subunit beta 1) The beta subunit of chorionic gonadotropin (CGB) is encoded by six highly homologous and structurally similar genes that are arranged in tandem and inverted pairs on chromosome 19q13.3, and contiguous with the luteinizing hormone beta (LHB) subunit gene. The CGB genes are primarily distinguished by differences in the 5' untranscribed region. This gene was originally thought to be one of the two pseudogenes (CGB1 and CGB2) of CGB subunit, however, detection of CGB1 and CGB2 transcripts in vivo, and their presence on the polysomes, suggested that these transcripts are translated. To date, a protein product corresponding to CGB1 has not been isolated. The deduced sequence of the hypothetical protein of 132 aa does not share any similarity with that of functional CGB subunits (PMID:8954017). However, a 155 aa protein, translated from a different frame, is about the same size, and shares 98% identity with other CGB subunits. [provided by RefSeq, Jul 2008]

CGB1 links:

ENSG00000267335 (HGNC:):

ENSG00000267335 links:

SNAR-G1 (HGNC:34327): (small NF90 (ILF3) associated RNA G1)

SNAR-G1 links:

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ACMG classification

Classification was made for transcript

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

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.82).

Transcripts

RefSeq

Gene	Transcript	HGVSc	Effect	Exon rank	MANE	Protein
CGB1	NM_033377.2 link	c.-134C>G	5_prime_UTR_variant	Exon 1 of 3	ENST00000301407.8	NP_203695.2
CGB1	NM_001382421.1 link	c.-347C>G	5_prime_UTR_variant	Exon 1 of 3		NP_001369350.1
SNAR-G1	NR_004383.1 link	n.-175G>C	upstream_gene_variant

Ensembl

Gene	Transcript	HGVSc	Effect	Exon rank	TSL	MANE	Protein
CGB1	ENST00000301407.8 link	c.-134C>G	5_prime_UTR_variant	Exon 1 of 3	1	NM_033377.2	ENSP00000301407.6
ENSG00000267335	ENST00000591656.1 link	c.-347C>G	5_prime_UTR_variant	Exon 1 of 3	2		ENSP00000466140.1
ENSG00000267335	ENST00000604577.1 link	c.-134C>G	5_prime_UTR_variant	Exon 1 of 3	1		ENSP00000474022.1
CGB1	ENST00000601167.1 link	c.-347C>G	5_prime_UTR_variant	Exon 1 of 3	5		ENSP00000472896.2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000177

AC:

AN:

1127942

Hom.:

Cov.:

AF XY:

0.00000350

AC XY:

AN XY:

571582

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

26942

American (AMR)

AF:

0.00

AC:

AN:

40080

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

23034

East Asian (EAS)

AF:

0.00

AC:

AN:

37084

South Asian (SAS)

AF:

0.00

AC:

AN:

76852

European-Finnish (FIN)

AF:

0.00

AC:

AN:

50734

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5096

European-Non Finnish (NFE)

AF:

0.00000244

AC:

AN:

819236

Other (OTH)

AF:

0.00

AC:

AN:

48884

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.575

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<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

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.82

CADD

Benign

0.38

(source)

DANN

Benign

0.59

PhyloP100

0.65

PromoterAI

0.040

Neutral

(source)

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over