chr19-29699295-G-A

Position:

• chr19-29699295-G-A

Variant summary

Our verdict is Benign. Variant got -9 ACMG points: 0P and 9B. BP4_Strong BS1_Supporting BS2

The NM_031448.6(C19orf12):​c.*3417C>T variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00983 in 151,388 control chromosomes in the GnomAD database, including 24 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.0098 (24 hom., cov: 31)
  • Exomes 𝑓: 0.00094 (4 hom.)
  • Failed GnomAD Quality Control
• Consequence: C19orf12 NM_031448.6 3_prime_UTR
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.745

Genes affected

C19orf12 (HGNC:25443): (chromosome 19 open reading frame 12) This gene encodes a small transmembrane protein. Mutations in this gene are a cause of neurodegeneration with brain iron accumulation-4 (NBIA4), but the specific function of the encoded protein is unknown. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, Dec 2011]

ACMG classification

Verdict is Benign. Variant got -9 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-1.03).
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00983 (1488/151388) while in subpopulation AFR AF= 0.0344 (1416/41186). AF 95% confidence interval is 0.0329. There are 24 homozygotes in gnomad4. There are 688 alleles in male gnomad4 subpopulation. Median coverage is 31. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting
• BS2: High Homozygotes in GnomAd4 at 24 SD gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
C19orf12	NM_031448.6	c.*3417C>T		3_prime_UTR_variant	3/3	ENST00000323670.14

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
C19orf12	ENST00000323670.14	c.*3417C>T		3_prime_UTR_variant	3/3	2	NM_031448.6	P1

Frequencies

GnomAD3 genomes AF: 0.00982 AC: 1485 AN: 151272 Hom.: 24 Cov.: 31

Gnomad AFR AF: 0.0344

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00290

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000774

Gnomad SAS AF: 0.000419

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000133

Gnomad OTH AF: 0.00676

GnomAD3 exomes AF: 0.00234 AC: 190 AN: 81100 Hom.: 4 AF XY: 0.00185 AC XY: 85 AN XY: 45832

Gnomad AFR exome AF: 0.0339

Gnomad AMR exome AF: 0.000984

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000407

Gnomad SAS exome AF: 0.000139

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000592

Gnomad OTH exome AF: 0.000822

GnomAD4 exome Data not reliable, filtered out with message: AS_VQSR AF: 0.000944 AC: 217 AN: 229794 Hom.: 4 Cov.: 0 AF XY: 0.000778 AC XY: 103 AN XY: 132342

Gnomad4 AFR exome AF: 0.0340

Gnomad4 AMR exome AF: 0.00120

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000365

Gnomad4 SAS exome AF: 0.000131

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000231

Gnomad4 OTH exome AF: 0.000946

GnomAD4 genome AF: 0.00983 AC: 1488 AN: 151388 Hom.: 24 Cov.: 31 AF XY: 0.00931 AC XY: 688 AN XY: 73938

Gnomad4 AFR AF: 0.0344

Gnomad4 AMR AF: 0.00290

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.000775

Gnomad4 SAS AF: 0.000210

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000133

Gnomad4 OTH AF: 0.00669

Alfa AF: 0.000632 Hom.: 0

Bravo AF: 0.0113

Asia WGS AF: 0.00173 AC: 6 AN: 3476

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Neurodegeneration with brain iron accumulation 4 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 12, 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, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-1.0
CADD	Benign	1.2
DANN	Benign	0.83

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: rs138368723; hg19: chr19-30190202;