Genetic Variant USH1G:c.-1C>A (chr17-74923074-G-T) – ACMG Classification: Uncertain_significance (0 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_173477.5(USH1G):c.-1C>A variant causes a 5 prime UTR change. The variant allele was found at a frequency of 0.0000007 in 1,428,454 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: 7.0e-7 ( 0 hom. )

Consequence

USH1G
NM_173477.5 5_prime_UTR

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 5.11

Publications

0 publications found

Variant links:

Genes affected

USH1G (HGNC:16356): (USH1 protein network component sans) This gene encodes a protein that contains three ankyrin domains, a class I PDZ-binding motif and a sterile alpha motif. The encoded protein interacts with harmonin, which is associated with Usher syndrome type 1C. This protein plays a role in the development and maintenance of the auditory and visual systems and functions in the cohesion of hair bundles formed by inner ear sensory cells. Mutations in this gene are associated with Usher syndrome type 1G (USH1G). Alternative splicing results in multiple transcript variants. [provided by RefSeq, Sep 2013]

USH1G links:

OTOP2 (HGNC:19657): (otopetrin 2) Predicted to enable proton channel activity. Predicted to be involved in proton transmembrane transport. Predicted to be located in plasma membrane. Predicted to be integral component of membrane. [provided by Alliance of Genome Resources, Apr 2022]

OTOP2 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.28).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_173477.5. 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
	USH1G	NM_173477.5	MANE Select	c.-1C>A		5_prime_UTR	Exon 1 of 3	NP_775748.2
	USH1G	NM_001282489.3		c.-257C>A		5_prime_UTR	Exon 1 of 3	NP_001269418.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	Effect	Exon Rank	Protein	UniProt
USH1G	ENST00000614341.5	TSL:1 MANE Select	c.-1C>A	5_prime_UTR	Exon 1 of 3	ENSP00000480279.1	Q495M9
OTOP2	ENST00000580223.2	TSL:1	c.-231+40G>T	intron	N/A	ENSP00000463837.2	A0A6E1ZAN8
USH1G	ENST00000579243.1	TSL:2	n.-1C>A	non_coding_transcript_exon	Exon 1 of 3	ENSP00000462568.1	J3KSN5

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

7.00e-7

AC:

AN:

1428454

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

706334

show subpopulations

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

African (AFR)

AF:

0.00

AC:

AN:

32852

American (AMR)

AF:

0.00

AC:

AN:

41660

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25446

East Asian (EAS)

AF:

0.0000261

AC:

AN:

38336

South Asian (SAS)

AF:

0.00

AC:

AN:

82464

European-Finnish (FIN)

AF:

0.00

AC:

AN:

50852

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4438

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1093682

Other (OTH)

AF:

0.00

AC:

AN:

58724

⚠️ 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: 0.225

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 v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.28

CADD

Benign

(source)

DANN

Benign

0.94

PhyloP100

5.1

PromoterAI

-0.16

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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over