2-70300842-G-A

Variant names:

• chr2-70300842-G-A
• rs690016537
• NM_001329752.2:c.547C>T

Variant summary

Our verdict is Uncertain significance. The variant received 5 ACMG points: 5P and 0B. PM2 PP3 PP5_Moderate

The NM_001329752.2(FAM136A):​c.547C>T​(p.Gln183*) variant causes a stop gained, splice region change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: FAM136A NM_001329752.2 stop_gained, splice_region
• Scores: Splicing: ADA: 0.9820
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 9.49
• Publications: 2 publications found

Genes affected

FAM136A (HGNC:25911): (family with sequence similarity 136 member A) This gene encodes a mitochondrially localized protein that is highly conserved across species. The gene is expressed in a variety of tissues including human lymphoblast cells and rat neurosensorial epithelium of the cristaampullaris. A mutation in this gene has been associated with familial Meniere's disease, a chronic disorder of the inner ear. Several pseudogenes of this gene are found on other chromosomes. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Aug 2016]

FAM136A Gene-Disease associations (from GenCC):

• Meniere disease

  Inheritance: Unknown Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Uncertain_significance. The variant received 5 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: Splicing predictors support a deleterious effect. Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. No scorers claiming Uncertain. Scorers claiming Benign: max_spliceai.
• PP5: Variant 2-70300842-G-A is Pathogenic according to our data. Variant chr2-70300842-G-A is described in ClinVar as Pathogenic. ClinVar VariationId is 140608.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001329752.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	FAM136A	NM_001329752.2	MANE Select	c.547C>T	p.Gln183*	stop_gained splice_region	Exon 2 of 3	NP_001316681.1
	FAM136A	NM_001329753.2		c.481C>T	p.Gln161*	stop_gained splice_region	Exon 2 of 3	NP_001316682.1
	FAM136A	NM_032822.3		c.226C>T	p.Gln76*	stop_gained splice_region	Exon 2 of 3	NP_116211.2

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	FAM136A	ENST00000430566.6	TSL:3 MANE Select	c.547C>T	p.Gln183*	stop_gained splice_region	Exon 2 of 3	ENSP00000397269.1
	FAM136A	ENST00000037869.8	TSL:1	c.226C>T	p.Gln76*	stop_gained splice_region	Exon 2 of 3	ENSP00000037869.3
	FAM136A	ENST00000460307.1	TSL:1	n.894C>T		splice_region non_coding_transcript_exon	Exon 2 of 3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 33

Alfa AF: 0.00 Hom.: 0

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Meniere disease Pathogenic:1

May 09, 2014

Otology & Neurotology- Genomics of vestibular disorders (CTS-495), Jose Antonio López Escámez, Centro Pfizer - Universidad de Granada - Junta de Andalucía de Genómica e Investigación Oncológica (GENYO)

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.62	D
BayesDel_noAF	Pathogenic	0.54
CADD	Pathogenic	43
DANN	Uncertain	1.0
Eigen	Pathogenic	1.1
Eigen_PC	Pathogenic	0.87
FATHMM_MKL	Uncertain	0.91	D
PhyloP100		9.5
Vest4		0.36
GERP RS		4.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.9
Mutation Taster		=1/199	disease causing (ClinVar)

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	0.98
dbscSNV1_RF	Pathogenic	0.82
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: rs690016537; hg19: chr2-70527974;