Genetic Variant TRIOBP:c.-60-2A>G (chr22-37701304-A-G) – ACMG Classification: Uncertain_significance (4 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PVS1_ModeratePM2

The NM_001039141.3(TRIOBP):c.-60-2A>G variant causes a splice acceptor, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000822 in 1,216,950 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 8.2e-7 ( 0 hom. )

Consequence

TRIOBP
NM_001039141.3 splice_acceptor, intron

Scores

Splicing: ADA: 0.9999

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 1.40

Publications

0 publications found

Variant links:

Genes affected

TRIOBP (HGNC:17009): (TRIO and F-actin binding protein) This gene encodes a protein with an N-terminal pleckstrin homology domain and a C-terminal coiled-coil region. The protein interacts with trio, which is involved with neural tissue development and controlling actin cytoskeleton organization, cell motility and cell growth. The protein also associates with F-actin and stabilizes F-actin structures. Mutations in this gene have been associated with a form of autosomal recessive nonsyndromic deafness. Multiple alternatively spliced transcript variants that would encode different isoforms have been found for this gene, however some transcripts may be subject to nonsense-mediated decay (NMD). [provided by RefSeq, Nov 2008]

TRIOBP Gene-Disease associations (from GenCC):

autosomal recessive nonsyndromic hearing loss 28
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Laboratory for Molecular Medicine, Labcorp Genetics (formerly Invitae), PanelApp Australia
hearing loss, autosomal recessive
Inheritance: AR Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet

TRIOBP links:

ENSG00000100101 (HGNC:):

ENSG00000100101 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

PVS1

Splicing +-2 bp (donor or acceptor) variant, product NOT destroyed by NMD, known LOF gene, truncates exone, which is 0.024513947 fraction of the gene. Cryptic splice site detected, with MaxEntScore 4.5, offset of 11, new splice context is: ttttgccgggcctcacatAGacg. Cryptic site results in frameshift change. If cryptic site found is not functional and variant results in exon loss, it results in inframe change.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TRIOBP	NM_001039141.3 link	c.-60-2A>G		splice_acceptor_variant, intron_variant	Intron 2 of 23	ENST00000644935.1	NP_001034230.1	Q9H2D6-1

Ensembl

Gene	Transcript	HGVSc	Effect	Exon rank	TSL	MANE	Protein	UniProt
TRIOBP	ENST00000644935.1 link	c.-60-2A>G	splice_acceptor_variant, intron_variant	Intron 2 of 23		NM_001039141.3	ENSP00000496394.1	Q9H2D6-1
ENSG00000100101	ENST00000455236.4 link	n.*277-2A>G	splice_acceptor_variant, intron_variant	Intron 8 of 12	5		ENSP00000477208.1	V9GYY5
TRIOBP	ENST00000492485.5 link	n.77-2A>G	splice_acceptor_variant, intron_variant	Intron 1 of 4	1
TRIOBP	ENST00000344404.10 link	n.-60-2A>G	splice_acceptor_variant, intron_variant	Intron 1 of 21	2		ENSP00000340312.6	H7BXW4

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

8.22e-7

AC:

AN:

1216950

Hom.:

Cov.:

AF XY:

0.00000164

AC XY:

AN XY:

611532

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

29116

American (AMR)

AF:

0.00

AC:

AN:

36406

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

23990

East Asian (EAS)

AF:

0.00

AC:

AN:

37640

South Asian (SAS)

AF:

0.00

AC:

AN:

76856

European-Finnish (FIN)

AF:

0.00

AC:

AN:

50176

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5306

European-Non Finnish (NFE)

AF:

0.00000110

AC:

AN:

905262

Other (OTH)

AF:

0.00

AC:

AN:

52198

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

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.72

CADD

Benign

(source)

DANN

Benign

0.75

PhyloP100

1.4

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

0.79

SpliceAI score (max)

0.99

Details are displayed if max score is > 0.2

DS_AG_spliceai

0.83

Position offset: 13

DS_AL_spliceai

0.99

Position offset: 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

ClinVar

Computational scores

Splicing

Publications

Other links and lift over