3-196318125-A-C

Position:

• chr3-196318125-A-C

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_152773.5(DYNLT2B):​c.28T>G​(p.Ser10Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000132 in 152,064 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: 𝑓 0.000013 (0 hom., cov: 30)
• Consequence: DYNLT2B NM_152773.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.343

Genes affected

DYNLT2B (HGNC:28482): (dynein light chain Tctex-type 2B) Dyneins are a group of microtubule-activated ATPases that function as molecular motors. They are divided into two subgroups of axonemal and cytoplasmic dyneins. The cytoplasmic dyneins function in intracellular motility, including retrograde axonal transport, protein sorting, organelle movement, and spindle dynamics. Molecules of conventional cytoplasmic dynein are comprised of 2 heavy chain polypeptides and a number of intermediate and light chains. This gene encodes a subunit of the human cytoplasmic dynein-2 complex. Mutations in this gene are associated with short-rib thoracic dysplasia 17 with or without polydactyly. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, May 2017]

TM4SF19-DYNLT2B (HGNC:):

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.053708136).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DYNLT2B	NM_152773.5	c.28T>G	p.Ser10Ala	missense_variant	1/5	ENST00000325318.10
TM4SF19-DYNLT2B	NR_037950.1	n.862-1894T>G		intron_variant, non_coding_transcript_variant
DYNLT2B	NM_001351628.2	c.28T>G	p.Ser10Ala	missense_variant	1/5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DYNLT2B	ENST00000325318.10	c.28T>G	p.Ser10Ala	missense_variant	1/5	1	NM_152773.5	P1
DYNLT2B	ENST00000446494.1	c.28T>G	p.Ser10Ala	missense_variant, NMD_transcript_variant	1/6	3
DYNLT2B	ENST00000426563.5	c.28T>G	p.Ser10Ala	missense_variant, NMD_transcript_variant	1/5	2

Frequencies

GnomAD3 genomes AF: 0.0000132 AC: 2 AN: 152064 Hom.: 0 Cov.: 30

Gnomad AFR AF: 0.0000483

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 31

GnomAD4 genome AF: 0.0000132 AC: 2 AN: 152064 Hom.: 0 Cov.: 30 AF XY: 0.0000135 AC XY: 1 AN XY: 74288

Gnomad4 AFR AF: 0.0000483

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.00

Gnomad4 OTH AF: 0.00

Bravo AF: 0.0000189

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Mar 18, 2022

This variant is not present in population databases (gnomAD no frequency). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The alanine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. This variant has not been reported in the literature in individuals affected with TCTEX1D2-related conditions. This sequence change replaces serine, which is neutral and polar, with alanine, which is neutral and non-polar, at codon 10 of the TCTEX1D2 protein (p.Ser10Ala). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.059
BayesDel_addAF	Benign	-0.34	T
BayesDel_noAF	Benign	-0.72
CADD	Benign	0.30
DANN	Benign	0.50
DEOGEN2	Benign	0.0068	T
Eigen	Benign	-1.3
Eigen_PC	Benign	-1.2
FATHMM_MKL	Benign	0.019	N
LIST_S2	Benign	0.17	T
M_CAP	Benign	0.041	D
MetaRNN	Benign	0.054	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.26	N
MutationTaster	Benign	1.0	N
PrimateAI	Uncertain	0.56	T
PROVEAN	Benign	-0.16	N
REVEL	Benign	0.022
Sift	Benign	0.90	T
Sift4G	Benign	0.91	T
Polyphen		0.0	B
Vest4		0.074
MutPred		0.35		Loss of disorder (P = 0.0572);
MVP		0.014
MPC		0.31
ClinPred		0.044	T
GERP RS		2.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.055
gMVP		0.12

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: rs1726941135; hg19: chr3-196044996;