16-21249980-G-T

Position:

• chr16-21249980-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_145865.3(ANKS4B):​c.414G>T​(p.Gln138His) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: ANKS4B NM_145865.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.53

Genes affected

ANKS4B (HGNC:26795): (ankyrin repeat and sterile alpha motif domain containing 4B) Involved in brush border assembly; cellular protein-containing complex assembly; and protein localization to microvillus. Located in brush border and microvillus. [provided by Alliance of Genome Resources, Apr 2022]

CRYM (HGNC:2418): (crystallin mu) Crystallins are separated into two classes: taxon-specific and ubiquitous. The former class is also called phylogenetically-restricted crystallins. The latter class constitutes the major proteins of vertebrate eye lens and maintains the transparency and refractive index of the lens. This gene encodes a taxon-specific crystallin protein that binds NADPH and has sequence similarity to bacterial ornithine cyclodeaminases. The encoded protein does not perform a structural role in lens tissue, and instead it binds thyroid hormone for possible regulatory or developmental roles. Mutations in this gene have been associated with autosomal dominant non-syndromic deafness. [provided by RefSeq, Sep 2014]

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.372798).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ANKS4B	NM_145865.3	c.414G>T	p.Gln138His	missense_variant	2/2	ENST00000311620.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ANKS4B	ENST00000311620.7	c.414G>T	p.Gln138His	missense_variant	2/2	1	NM_145865.3	P1
CRYM	ENST00000574448.5	c.*521-5912C>A		intron_variant, NMD_transcript_variant		1
CRYM	ENST00000570401.5	c.265-5912C>A		intron_variant		5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

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

May 04, 2023

The c.414G>T (p.Q138H) alteration is located in exon 2 (coding exon 2) of the ANKS4B gene. This alteration results from a G to T substitution at nucleotide position 414, causing the glutamine (Q) at amino acid position 138 to be replaced by a histidine (H). 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	Benign	0.31
BayesDel_addAF	Benign	-0.062	T
BayesDel_noAF	Benign	-0.33
CADD	Uncertain	23
DANN	Uncertain	1.0
DEOGEN2	Benign	0.10	T
Eigen	Pathogenic	0.72
Eigen_PC	Pathogenic	0.71
FATHMM_MKL	Uncertain	0.96	D
M_CAP	Benign	0.013	T
MetaRNN	Benign	0.37	T
MetaSVM	Benign	-0.68	T
MutationAssessor	Uncertain	2.3	M
MutationTaster	Benign	1.0	D
PrimateAI	Benign	0.40	T
PROVEAN	Uncertain	-2.7	D
REVEL	Benign	0.16
Sift	Uncertain	0.014	D
Sift4G	Uncertain	0.019	D
Polyphen		1.0	D
Vest4		0.45
MutPred		0.42		Gain of helix (P = 0.132);
MVP		0.69
MPC		0.77
ClinPred		0.99	D
GERP RS		5.8
Varity_R		0.36
gMVP		0.74

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: chr16-21261301;