chr18-47033343-A-G

Position:

• chr18-47033343-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_016427.3(ELOA2):​c.1922T>C​(p.Met641Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,696 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: ELOA2 NM_016427.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.377

Genes affected

ELOA2 (HGNC:30771): (elongin A2) This gene encodes the transcriptionally active subunit of the SIII (or elongin) transcription elongation factor complex, which also includes two regulatory subunits, elongins B and C. This complex acts to increase the rate of RNA chain elongation by RNA polymerase II by suppressing transient pausing of the polymerase at many sites along the DNA template. Whereas a related protein with similar function, elongin A, is ubiquitously expressed, the encoded protein is specifically expressed in the testis, suggesting it may have a role in spermatogenesis. [provided by RefSeq, Jul 2008]

KATNAL2 (HGNC:25387): (katanin catalytic subunit A1 like 2) Predicted to enable microtubule-severing ATPase activity. Predicted to be involved in cytoplasmic microtubule organization. Located in cytoplasm; microtubule; and spindle pole. [provided by Alliance of Genome Resources, Apr 2022]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.22558513).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ELOA2	NM_016427.3	c.1922T>C	p.Met641Thr	missense_variant	1/1	ENST00000332567.6	NP_057511.2
KATNAL2	NM_001387690.1	c.52-13114A>G		intron_variant		ENST00000683218.1	NP_001374619.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ELOA2	ENST00000332567.6	c.1922T>C	p.Met641Thr	missense_variant	1/1		NM_016427.3	ENSP00000331302	P1
KATNAL2	ENST00000683218.1	c.52-13114A>G		intron_variant			NM_001387690.1	ENSP00000508137	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461696 Hom.: 0 Cov.: 30 AF XY: 0.00000275 AC XY: 2 AN XY: 727164

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.0000383

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 27, 2023

The c.1922T>C (p.M641T) alteration is located in exon 1 (coding exon 1) of the TCEB3B gene. This alteration results from a T to C substitution at nucleotide position 1922, causing the methionine (M) at amino acid position 641 to be replaced by a threonine (T). 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	Uncertain	0.51
BayesDel_addAF	Benign	-0.10	T
BayesDel_noAF	Benign	-0.38
CADD	Benign	13
DANN	Benign	0.71
DEOGEN2	Benign	0.14	T;.
Eigen	Benign	-0.51
Eigen_PC	Benign	-0.71
FATHMM_MKL	Benign	0.054	N
LIST_S2	Benign	0.43	T;T
M_CAP	Benign	0.0014	T
MetaRNN	Benign	0.23	T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Uncertain	2.5	M;.
MutationTaster	Benign	1.0	N;N;N;N
PrimateAI	Uncertain	0.66	T
PROVEAN	Pathogenic	-5.0	D;.
REVEL	Benign	0.079
Sift	Uncertain	0.0010	D;.
Sift4G	Uncertain	0.0030	D;T
Polyphen		0.26	B;.
Vest4		0.36
MutPred		0.62		Loss of catalytic residue at M641 (P = 1e-04);.;
MVP		0.16
MPC		0.070
ClinPred		0.96	D
GERP RS		1.4
Varity_R		0.78
gMVP		0.33

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

No publications associated with this variant yet.

Other links and lift over

hg19: chr18-44559714;