Genetic Variant TIMM8A:p.Ser94Ser (chrX-101346511-G-A) – ACMG Classification: Likely_benign (-1 pts)

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 2P and 3B. PM2BP4_ModerateBP7

The NM_004085.4(TIMM8A):c.282C>T(p.Ser94Ser) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000911 in 1,097,279 control chromosomes in the GnomAD database, with no homozygous occurrence. There are no hemizygote samples in GnomAD. 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: 23)

Exomes 𝑓: 9.1e-7 ( 0 hom. 0 hem. )

Consequence

TIMM8A
NM_004085.4 synonymous

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 2.69

Publications

0 publications found

Variant links:

Genes affected

TIMM8A (HGNC:11817): (translocase of inner mitochondrial membrane 8A) This translocase is involved in the import and insertion of hydrophobic membrane proteins from the cytoplasm into the mitochondrial inner membrane. The gene is mutated in Mohr-Tranebjaerg syndrome/Deafness Dystonia Syndrome (MTS/DDS) and it is postulated that MTS/DDS is a mitochondrial disease caused by a defective mitochondrial protein import system. Defects in this gene also cause Jensen syndrome; an X-linked disease with opticoacoustic nerve atrophy and muscle weakness. This protein, along with TIMM13, forms a 70 kDa heterohexamer. Alternative splicing results in multiple transcript variants encoding distinct isoforms.[provided by RefSeq, Mar 2009]

TIMM8A Gene-Disease associations (from GenCC):

deafness dystonia syndrome
Inheritance: XL Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: PanelApp Australia, Ambry Genetics, Orphanet, Labcorp Genetics (formerly Invitae), Genomics England PanelApp, G2P, ClinGen

TIMM8A links:

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ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.45).

BP7

Synonymous conserved (PhyloP=2.69 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004085.4. 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
	TIMM8A	NM_004085.4	MANE Select	c.282C>T	p.Ser94Ser	synonymous	Exon 2 of 2	NP_004076.1
	TIMM8A	NM_001145951.2		c.*1876C>T		3_prime_UTR	Exon 2 of 2	NP_001139423.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
TIMM8A	ENST00000372902.4	TSL:1 MANE Select	c.282C>T	p.Ser94Ser	synonymous	Exon 2 of 2	ENSP00000361993.3
TIMM8A	ENST00000645279.1		n.*476C>T		non_coding_transcript_exon	Exon 3 of 3	ENSP00000494239.1
TIMM8A	ENST00000647480.1		n.799C>T		non_coding_transcript_exon	Exon 2 of 2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000545

AC:

AN:

183431

AF XY:

0.00

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000365

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

9.11e-7

AC:

AN:

1097279

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

363157

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

26371

American (AMR)

AF:

0.0000284

AC:

AN:

35201

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

19383

East Asian (EAS)

AF:

0.00

AC:

AN:

30204

South Asian (SAS)

AF:

0.00

AC:

AN:

54102

European-Finnish (FIN)

AF:

0.00

AC:

AN:

40529

Middle Eastern (MID)

AF:

0.00

AC:

AN:

3422

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

842043

Other (OTH)

AF:

0.00

AC:

AN:

46024

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

Alfa

AF:

0.00

Hom.:

Bravo

AF:

0.00000756

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.45

CADD

Benign

(source)

DANN

Benign

0.80

PhyloP100

2.7

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

ClinVar

Computational scores

Splicing

Publications

Other links and lift over