18-36138399-C-T

Variant names:

• chr18-36138399-C-T
• rs200469142
• NM_018255.4:c.418C>T

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PP5_Moderate BS1_Supporting

The NM_001324468.2(ELP2):​c.-30C>T variant causes a 5 prime UTR premature start codon gain change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000031 in 1,613,980 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency:
  • Genomes: 𝑓 0.00011 (0 hom., cov: 33)
  • Exomes 𝑓: 0.000023 (0 hom.)
• Consequence: ELP2 NM_001324468.2 5_prime_UTR_premature_start_codon_gain
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 0.197

Genes affected

ELP2 (HGNC:18248): (elongator acetyltransferase complex subunit 2) The protein encoded by this gene is a core subunit of the elongator complex, a histone acetyltransferase complex that associates with RNA polymerase II. In addition to histone acetylation, the encoded protein effects transcriptional elongation and may help remodel chromatin. [provided by RefSeq, May 2016]

ACMG classification

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

• PP5: Variant 18-36138399-C-T is Pathogenic according to our data. Variant chr18-36138399-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 3336513.Status of the report is criteria_provided_single_submitter, 1 stars.
• BS1: Variant frequency is greater than expected in population amr. GnomAd4 allele frequency = 0.000112 (17/152176) while in subpopulation AMR AF = 0.000785 (12/15288). AF 95% confidence interval is 0.000452. There are 0 homozygotes in GnomAd4. There are 7 alleles in the male GnomAd4 subpopulation. Median coverage is 33. This position FAILED quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ELP2	NM_018255.4	c.418C>T	p.Arg140*	stop_gained	Exon 4 of 22	ENST00000358232.11	NP_060725.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ELP2	ENST00000358232.11	c.418C>T	p.Arg140*	stop_gained	Exon 4 of 22	1	NM_018255.4	ENSP00000350967.6

Frequencies

GnomAD3 genomes AF: 0.000112 AC: 17 AN: 152058 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.0000242

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.000786

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000193

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000294

Gnomad OTH AF: 0.000478

GnomAD2 exomes AF: 0.0000239 AC: 6 AN: 251406 AF XY: 0.00000736

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000579

Gnomad ASJ exome AF: 0.0000992

Gnomad EAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000176

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.0000226 AC: 33 AN: 1461804 Hom.: 0 Cov.: 34 AF XY: 0.0000193 AC XY: 14 AN XY: 727202

Gnomad4 AFR exome AF: 0.00 AC: 0 AN: 33478

Gnomad4 AMR exome AF: 0.0000447 AC: 2 AN: 44718

Gnomad4 ASJ exome AF: 0.0000765 AC: 2 AN: 26132

Gnomad4 EAS exome AF: 0.00 AC: 0 AN: 39688

Gnomad4 SAS exome AF: 0.0000348 AC: 3 AN: 86246

Gnomad4 FIN exome AF: 0.00 AC: 0 AN: 53408

Gnomad4 NFE exome AF: 0.0000207 AC: 23 AN: 1111978

Gnomad4 Remaining exome AF: 0.0000497 AC: 3 AN: 60392

GnomAD4 genome AF: 0.000112 AC: 17 AN: 152176 Hom.: 0 Cov.: 33 AF XY: 0.0000941 AC XY: 7 AN XY: 74378

Gnomad4 AFR AF: 0.0000241 AC: 0.0000240906 AN: 0.0000240906

Gnomad4 AMR AF: 0.000785 AC: 0.000784929 AN: 0.000784929

Gnomad4 ASJ AF: 0.00 AC: 0 AN: 0

Gnomad4 EAS AF: 0.000193 AC: 0.00019305 AN: 0.00019305

Gnomad4 SAS AF: 0.00 AC: 0 AN: 0

Gnomad4 FIN AF: 0.00 AC: 0 AN: 0

Gnomad4 NFE AF: 0.0000294 AC: 0.0000294057 AN: 0.0000294057

Gnomad4 OTH AF: 0.000473 AC: 0.00047259 AN: 0.00047259

Alfa AF: 0.0000805 Hom.: 0

Bravo AF: 0.000223

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000233 AC: 2

ExAC AF: 0.0000247 AC: 3

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Intellectual disability, autosomal recessive 58 Pathogenic:1

May 17, 2024

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: ELP2 c.418C>T (p.Arg140X) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. The variant allele was found at a frequency of 2.4e-05 in 251406 control chromosomes. To our knowledge, no occurrence of c.418C>T in individuals affected with Mental Retardation, Autosomal Recessive 58 and no experimental evidence demonstrating its impact on protein function have been reported. No submitters have cited clinical-significance assessments for this variant to ClinVar. Based on the evidence outlined above, the variant was classified as pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Uncertain	0.16	D
BayesDel_noAF	Uncertain	0.090
CADD	Pathogenic	35
DANN	Uncertain	0.99
Eigen	Benign	-0.24
Eigen_PC	Benign	-0.57
FATHMM_MKL	Benign	0.15	N
Vest4		0.91
GERP RS		-5.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Mutation Taster		=8/192	disease causing (fs/PTC)

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: rs200469142; hg19: chr18-33718362;