chr19-6495053-C-A

Variant names:

• chr19-6495053-C-A
• rs446199
• NM_006087.4:c.*111G>T

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BS1 BS2

The NM_006087.4(TUBB4A):​c.*111G>T variant causes a 3 prime UTR change involving the alteration of a non-conserved nucleotide. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency:
  • Genomes: 𝑓 0.0 (0 hom., cov: 27)
  • Exomes 𝑓: 0.000013 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: TUBB4A NM_006087.4 3_prime_UTR
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -2.50
• Publications: 7 publications found

Genes affected

TUBB4A (HGNC:20774): (tubulin beta 4A class IVa) This gene encodes a member of the beta tubulin family. Beta tubulins are one of two core protein families (alpha and beta tubulins) that heterodimerize and assemble to form microtubules. Mutations in this gene cause hypomyelinating leukodystrophy-6 and autosomal dominant torsion dystonia-4. Alternate splicing results in multiple transcript variants encoding different isoforms. A pseudogene of this gene is found on chromosome X. [provided by RefSeq, Jan 2014]

TUBB4A Gene-Disease associations (from GenCC):

• hypomyelinating leukodystrophy 6

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE, SUPPORTIVE Submitted by: Genomics England PanelApp, Orphanet, Labcorp Genetics (formerly Invitae), Illumina
• TUBB4A-related neurologic disorder

  Inheritance: AD Classification: DEFINITIVE, MODERATE Submitted by: Ambry Genetics, ClinGen
• torsion dystonia 4

  Inheritance: AD Classification: STRONG, SUPPORTIVE Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae), Orphanet

ENSG00000268191 (HGNC:):

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.93).
• BS1: Variant frequency is greater than expected in population sas. GnomAdExome4 allele frequency = 0.0000129 (15/1159022) while in subpopulation SAS AF = 0.000148 (10/67686). AF 95% confidence interval is 0.0000795. There are 0 homozygotes in GnomAdExome4. There are 11 alleles in the male GnomAdExome4 subpopulation. Median coverage is 16. This position passed quality control check.
• BS2: High AC in GnomAdExome4 at 15 AD gene.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_006087.4. 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
	TUBB4A	NM_006087.4	MANE Select	c.*111G>T		3_prime_UTR	Exon 4 of 4	NP_006078.2
	TUBB4A	NM_001289123.2		c.*111G>T		3_prime_UTR	Exon 5 of 5	NP_001276052.1	M0QZL7
	TUBB4A	NM_001289127.2		c.*111G>T		3_prime_UTR	Exon 5 of 5	NP_001276056.1	M0R278

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TUBB4A	ENST00000264071.7	TSL:1 MANE Select	c.*111G>T		3_prime_UTR	Exon 4 of 4	ENSP00000264071.1	P04350
	TUBB4A	ENST00000714086.1		c.*985G>T		3_prime_UTR	Exon 4 of 4	ENSP00000519377.1	A0AAQ5BHG7
	TUBB4A	ENST00000598635.2	TSL:4	c.*111G>T		downstream_gene	N/A	ENSP00000470627.2	M0QZL7

Frequencies

GnomAD3 genomes AF: 0.00 AC: 0 AN: 151258 Hom.: 0 Cov.: 27

Gnomad AFR AF: 0.00

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 AF: 0.0000129 AC: 15 AN: 1159022 Hom.: 0 Cov.: 16 AF XY: 0.0000191 AC XY: 11 AN XY: 576060

African (AFR) AF: 0.00 AC: 0 AN: 26790

American (AMR) AF: 0.00 AC: 0 AN: 30604

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 19850

East Asian (EAS) AF: 0.00 AC: 0 AN: 35528

South Asian (SAS) AF: 0.000148 AC: 10 AN: 67686

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 47752

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 3506

European-Non Finnish (NFE) AF: 0.00000570 AC: 5 AN: 877714

Other (OTH) AF: 0.00 AC: 0 AN: 49592

GnomAD4 genome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 151258 Hom.: 0 Cov.: 27 AF XY: 0.00 AC XY: 0 AN XY: 73808

African (AFR) AF: 0.00 AC: 0 AN: 41100

American (AMR) AF: 0.00 AC: 0 AN: 15148

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3470

East Asian (EAS) AF: 0.00 AC: 0 AN: 5100

South Asian (SAS) AF: 0.00 AC: 0 AN: 4788

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10502

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 67850

Other (OTH) AF: 0.00 AC: 0 AN: 2076

Alfa AF: 0.00 Hom.: 1574

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.93
CADD	Benign	0.25
DANN	Benign	0.23
PhyloP100		-2.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.0

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

Other links and lift over

dbSNP: rs446199; hg19: chr19-6495064;