rs1555976109

Variant names:

• chrX-101346535-T-C
• rs1555976109
• NM_004085.4:c.258A>G

Variant summary

Our verdict is Benign. The variant received -11 ACMG points: 0P and 11B. BP4_Strong BP6_Moderate BP7 BS2

The NM_004085.4(TIMM8A):​c.258A>G​(p.Lys86Lys) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000128 in 1,097,818 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 5 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★).

• Frequency:
  • Genomes: not found (cov: 24)
  • Exomes 𝑓: 0.000013 (0 hom. 5 hem.)
• Consequence: TIMM8A NM_004085.4 synonymous
• Clinical Significance: Benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 2.13
• Publications: 0 publications found

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: Ambry Genetics, PanelApp Australia, ClinGen, G2P, Labcorp Genetics (formerly Invitae), Orphanet, Genomics England PanelApp

ACMG classification

Our verdict: Benign. The variant received -11 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.54).
• BP6: Variant X-101346535-T-C is Benign according to our data. Variant chrX-101346535-T-C is described in ClinVar as Benign. ClinVar VariationId is 1617249.Status of the report is criteria_provided_single_submitter, 1 stars.
• BP7: Synonymous conserved (PhyloP=2.13 with no splicing effect.
• BS2: High Hemizygotes in GnomAdExome4 at 5 XL gene

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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TIMM8A	NM_004085.4	MANE Select	c.258A>G	p.Lys86Lys	synonymous	Exon 2 of 2	NP_004076.1	O60220
	TIMM8A	NM_001145951.2		c.*1852A>G		3_prime_UTR	Exon 2 of 2	NP_001139423.1	A0A2R8YDA8

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TIMM8A	ENST00000372902.4	TSL:1 MANE Select	c.258A>G	p.Lys86Lys	synonymous	Exon 2 of 2	ENSP00000361993.3	O60220
	TIMM8A	ENST00000940410.1		c.261A>G	p.Lys87Lys	synonymous	Exon 2 of 2	ENSP00000610469.1
	TIMM8A	ENST00000940411.1		c.252A>G	p.Lys84Lys	synonymous	Exon 2 of 2	ENSP00000610470.1

Frequencies

GnomAD3 genomes Cov.: 24

GnomAD2 exomes AF: 0.0000109 AC: 2 AN: 183498 AF XY: 0.0000294

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000244

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000128 AC: 14 AN: 1097818 Hom.: 0 Cov.: 31 AF XY: 0.0000138 AC XY: 5 AN XY: 363358

African (AFR) AF: 0.00 AC: 0 AN: 26385

American (AMR) AF: 0.00 AC: 0 AN: 35202

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 19384

East Asian (EAS) AF: 0.00 AC: 0 AN: 30205

South Asian (SAS) AF: 0.00 AC: 0 AN: 54119

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 40532

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 3789

European-Non Finnish (NFE) AF: 0.0000154 AC: 13 AN: 842138

Other (OTH) AF: 0.0000217 AC: 1 AN: 46064

GnomAD4 genome Cov.: 24

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000756

ClinVar

ClinVar submissions

Significance: Benign

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	-	1	not provided (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.54
CADD	Benign	10
DANN	Benign	0.76
PhyloP100		2.1

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

Other links and lift over

dbSNP: rs1555976109; hg19: chrX-100601523;