3-196318038-G-T

Variant names:

• chr3-196318038-G-T
• rs1056574154
• NM_152773.5:c.113+2C>A

Variant summary

Our verdict is Likely pathogenic. The variant received 6 ACMG points: 6P and 0B. PVS1_Strong PM2

The NM_152773.5(DYNLT2B):​c.113+2C>A variant causes a splice donor, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000733 in 1,363,688 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 2/2 splice prediction tools predicting alterations to normal splicing. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 7.3e-7 (0 hom.)
• Consequence: DYNLT2B NM_152773.5 splice_donor, intron
• Scores: Splicing: ADA: 1.000
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.17
• Publications: 0 publications found

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]

ENSG00000272741 (HGNC:):

TM4SF19-DYNLT2B (HGNC:49190): (TM4SF19-DYNLT2B readthrough (NMD candidate)) This locus represents naturally occurring read-through transcription between the neighboring transmembrane 4 L six family member 19 (TM4SF19) and Tctex1 domain containing 2 (TCTEX1D2) genes on chromosome 3. The read-through transcript is a candidate for nonsense-mediated mRNA decay (NMD), and is thus not expected to produce a protein product. [provided by RefSeq, Mar 2011]

TM4SF19-AS1 (HGNC:41085): (TM4SF19 antisense RNA 1)

ACMG classification

Our verdict: Likely_pathogenic. The variant received 6 ACMG points.

• PVS1: Splicing +-2 bp (donor or acceptor) variant, product NOT destroyed by NMD, known LOF gene, truncates exone, which is 0.46853146 fraction of the gene.
• PM2: Very rare variant in population databases, with high coverage

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_152773.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DYNLT2B	NM_152773.5	MANE Select	c.113+2C>A		splice_donor intron	N/A	NP_689986.2	Q8WW35
	DYNLT2B	NM_001351628.2		c.113+2C>A		splice_donor intron	N/A	NP_001338557.1
	TM4SF19-DYNLT2B	NR_037950.1		n.862-1807C>A		intron	N/A

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	DYNLT2B	ENST00000325318.10	TSL:1 MANE Select	c.113+2C>A		splice_donor intron	N/A	ENSP00000324323.5	Q8WW35
	ENSG00000272741	ENST00000431391.1	TSL:5	n.113+2C>A		splice_donor intron	N/A	ENSP00000405181.1	E7ESA3
	TM4SF19-DYNLT2B	ENST00000442633.1	TSL:1	n.*74-1807C>A		intron	N/A	ENSP00000405973.1

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 7.33e-7 AC: 1 AN: 1363688 Hom.: 0 Cov.: 30 AF XY: 0.00000148 AC XY: 1 AN XY: 676724

African (AFR) AF: 0.00 AC: 0 AN: 28660

American (AMR) AF: 0.00 AC: 0 AN: 31470

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 23532

East Asian (EAS) AF: 0.00 AC: 0 AN: 31428

South Asian (SAS) AF: 0.00 AC: 0 AN: 74610

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 48968

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5498

European-Non Finnish (NFE) AF: 9.40e-7 AC: 1 AN: 1063518

Other (OTH) AF: 0.00 AC: 0 AN: 56004

GnomAD4 genome Cov.: 31

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.60	D
BayesDel_noAF	Pathogenic	0.27
CADD	Pathogenic	26
DANN	Uncertain	0.99
Eigen	Pathogenic	0.87
Eigen_PC	Pathogenic	0.68
FATHMM_MKL	Benign	0.73	D
PhyloP100		2.2
GERP RS		4.6
PromoterAI		0.00060	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.9
Mutation Taster		=2/98	disease causing

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Pathogenic	1.0
SpliceAI score (max)		0.60		Details are displayed if max score is > 0.2
DS_DL_spliceai		0.60		Position offset: 2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs1056574154; hg19: chr3-196044909;