chr12-57797580-G-C

Position:

• chr12-57797580-G-C

Variant summary

Our verdict is Benign. Variant got -14 ACMG points: 0P and 14B. BP4_Strong BP6_Moderate BS1 BS2

The NM_006576.4(AVIL):​c.*302C>G variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00143 in 921,872 control chromosomes in the GnomAD database, including 18 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★).

• Frequency:
  • Genomes: 𝑓 0.0064 (12 hom., cov: 32)
  • Exomes 𝑓: 0.00044 (6 hom.)
• Consequence: AVIL NM_006576.4 3_prime_UTR
• Clinical Significance: Benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.936

Genes affected

TSFM (HGNC:12367): (Ts translation elongation factor, mitochondrial) This gene encodes a mitochondrial translation elongation factor. The encoded protein is an enzyme that catalyzes the exchange of guanine nucleotides on the translation elongation factor Tu during the elongation step of mitchondrial protein translation. Mutations in this gene are associated with combined oxidative phosphorylation deficiency-3 syndrome. Alternate splicing results in multiple transcript variants.[provided by RefSeq, Mar 2010]

AVIL (HGNC:14188): (advillin) The protein encoded by this gene is a member of the gelsolin/villin family of actin regulatory proteins. This protein has structural similarity to villin. It binds actin and may play a role in the development of neuronal cells that form ganglia. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Benign. Variant got -14 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.84).
• BP6: Variant 12-57797580-G-C is Benign according to our data. Variant chr12-57797580-G-C is described in ClinVar as [Benign]. Clinvar id is 310030.Status of the report is criteria_provided_single_submitter, 1 stars.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00644 (980/152270) while in subpopulation AFR AF= 0.0224 (929/41552). AF 95% confidence interval is 0.0212. There are 12 homozygotes in gnomad4. There are 497 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 12 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
TSFM	NM_005726.6	c.*997G>C		3_prime_UTR_variant	6/6	ENST00000652027.2
AVIL	NM_006576.4	c.*302C>G		3_prime_UTR_variant	20/20	ENST00000549994.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
AVIL	ENST00000549994.2	c.*302C>G		3_prime_UTR_variant	20/20	4	NM_006576.4	P1
TSFM	ENST00000652027.2	c.*997G>C		3_prime_UTR_variant	6/6		NM_005726.6	P1

Frequencies

GnomAD3 genomes AF: 0.00639 AC: 973 AN: 152152 Hom.: 12 Cov.: 32

Gnomad AFR AF: 0.0223

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00236

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00633

Gnomad NFE AF: 0.0000294

Gnomad OTH AF: 0.00478

GnomAD4 exome AF: 0.000435 AC: 335 AN: 769602 Hom.: 6 Cov.: 12 AF XY: 0.000414 AC XY: 148 AN XY: 357634

Gnomad4 AFR exome AF: 0.0190

Gnomad4 AMR exome AF: 0.00133

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000357

Gnomad4 OTH exome AF: 0.00108

GnomAD4 genome AF: 0.00644 AC: 980 AN: 152270 Hom.: 12 Cov.: 32 AF XY: 0.00668 AC XY: 497 AN XY: 74436

Gnomad4 AFR AF: 0.0224

Gnomad4 AMR AF: 0.00235

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000294

Gnomad4 OTH AF: 0.00473

Alfa AF: 0.00437 Hom.: 0

Bravo AF: 0.00713

Asia WGS AF: 0.000867 AC: 3 AN: 3476

ClinVar

Significance: Benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

Fatal mitochondrial disease due to combined oxidative phosphorylation defect type 3 Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.84
CADD	Benign	2.2
DANN	Benign	0.56

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

LitVar

Other links and lift over

dbSNP: rs114214463; hg19: chr12-58191363;