chr16-8796256-G-T

Variant names:

• chr16-8796256-G-T
• rs202170837
• NM_015421.4:c.338C>A

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_015421.4(TMEM186):​c.338C>A​(p.Ala113Asp) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000496 in 1,614,054 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.00029 (0 hom., cov: 33)
  • Exomes 𝑓: 0.00052 (0 hom.)
• Consequence: TMEM186 NM_015421.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 8.11

Genes affected

TMEM186 (HGNC:24530): (transmembrane protein 186) This gene encodes a potential transmembrane protein. [provided by RefSeq, Dec 2012]

PMM2 (HGNC:9115): (phosphomannomutase 2) The protein encoded by this gene catalyzes the isomerization of mannose 6-phosphate to mannose 1-phosphate, which is a precursor to GDP-mannose necessary for the synthesis of dolichol-P-oligosaccharides. Mutations in this gene have been shown to cause defects in glycoprotein biosynthesis, which manifests as carbohydrate-deficient glycoprotein syndrome type I. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.821

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TMEM186	NM_015421.4	c.338C>A	p.Ala113Asp	missense_variant	Exon 2 of 2	ENST00000333050.7	NP_056236.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TMEM186	ENST00000333050.7	c.338C>A	p.Ala113Asp	missense_variant	Exon 2 of 2	1	NM_015421.4	ENSP00000331640.6
PMM2	ENST00000566983.5	c.-15-5543G>T		intron_variant	Intron 1 of 7	5		ENSP00000457956.1
TMEM186	ENST00000564869.1	n.31+1356C>A		intron_variant	Intron 1 of 2	4

Frequencies

GnomAD3 genomes AF: 0.000289 AC: 44 AN: 152166 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.0000483

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000459

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000470

Gnomad OTH AF: 0.000957

GnomAD3 exomes AF: 0.000243 AC: 61 AN: 251398 Hom.: 0 AF XY: 0.000294 AC XY: 40 AN XY: 135872

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000867

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000163

Gnomad FIN exome AF: 0.000185

Gnomad NFE exome AF: 0.000422

Gnomad OTH exome AF: 0.000163

GnomAD4 exome AF: 0.000518 AC: 757 AN: 1461888 Hom.: 0 Cov.: 31 AF XY: 0.000525 AC XY: 382 AN XY: 727246

Gnomad4 AFR exome AF: 0.0000896

Gnomad4 AMR exome AF: 0.000134

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000139

Gnomad4 FIN exome AF: 0.000131

Gnomad4 NFE exome AF: 0.000625

Gnomad4 OTH exome AF: 0.000563

GnomAD4 genome AF: 0.000289 AC: 44 AN: 152166 Hom.: 0 Cov.: 33 AF XY: 0.000323 AC XY: 24 AN XY: 74332

Gnomad4 AFR AF: 0.0000483

Gnomad4 AMR AF: 0.000459

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000470

Gnomad4 OTH AF: 0.000957

Alfa AF: 0.000535 Hom.: 0

Bravo AF: 0.000276

TwinsUK AF: 0.000270 AC: 1

ALSPAC AF: 0.00104 AC: 4

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000349 AC: 3

ExAC AF: 0.000222 AC: 27

EpiCase AF: 0.000436

EpiControl AF: 0.000652

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Apr 25, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.338C>A (p.A113D) alteration is located in exon 2 (coding exon 2) of the TMEM186 gene. This alteration results from a C to A substitution at nucleotide position 338, causing the alanine (A) at amino acid position 113 to be replaced by an aspartic acid (D). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.91
BayesDel_addAF	Uncertain	0.040	T
BayesDel_noAF	Pathogenic	0.18
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Uncertain	0.50	D
Eigen	Pathogenic	0.71
Eigen_PC	Uncertain	0.65
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Benign	0.73	T
M_CAP	Benign	0.069	D
MetaRNN	Pathogenic	0.82	D
MetaSVM	Benign	-0.47	T
MutationAssessor	Pathogenic	3.0	M
PrimateAI	Uncertain	0.49	T
PROVEAN	Pathogenic	-5.0	D
REVEL	Uncertain	0.60
Sift	Uncertain	0.0020	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.89
MVP		0.37
MPC		0.27
ClinPred		0.82	D
GERP RS		5.2
Varity_R		0.85
gMVP		0.96

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: rs202170837; hg19: chr16-8890113;